PackagesCanonicalsLogsProblems
    Packages
    hl7.fhir.uv.phd@2.0.0-ballot2
    http://hl7.org/fhir/uv/phd/StructureDefinition/SimpleAlerting
{
  "description": "A simple alerting extension for PHDs.",
  "_filename": "StructureDefinition-SimpleAlerting.json",
  "package_name": "hl7.fhir.uv.phd",
  "date": "2025-08-06T14:14:22+00:00",
  "derivation": "constraint",
  "publisher": "HL7 International / Health Care Devices",
  "fhirVersion": "4.0.1",
  "jurisdiction": [ {
    "coding": [ {
      "code": "001",
      "system": "http://unstats.un.org/unsd/methods/m49/m49.htm"
    } ]
  } ],
  "name": "SimpleAlerting",
  "mapping": [ {
    "uri": "http://hl7.org/v3",
    "name": "RIM Mapping",
    "identity": "rim"
  } ],
  "abstract": false,
  "type": "Extension",
  "experimental": null,
  "resourceType": "StructureDefinition",
  "title": "Simple Alerting",
  "package_version": "2.0.0-ballot2",
  "extension": [ {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode": "dev"
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger": 1,
    "_valueInteger": {
      "extension": [ {
        "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
        "valueCanonical": "http://hl7.org/fhir/uv/phd/ImplementationGuide/hl7.fhir.uv.phd"
      } ]
    }
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode": "trial-use",
    "_valueCode": {
      "extension": [ {
        "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
        "valueCanonical": "http://hl7.org/fhir/uv/phd/ImplementationGuide/hl7.fhir.uv.phd"
      } ]
    }
  } ],
  "snapshot": {
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        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension",
      "min": 0,
      "definition": "A simple set of parameters for basic alerting on numerical observed data.",
      "isModifier": false,
      "short": "SimpleAlerting",
      "max": "1",
      "id": "Extension",
      "condition": [ "ele-1" ],
      "base": {
        "max": "*",
        "min": 0,
        "path": "Extension"
      }
    }, {
      "path": "Extension.id",
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      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
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        "path": "Element.id"
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      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
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      "path": "Extension.extension",
      "min": 2,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
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        "discriminator": [ {
          "path": "url",
          "type": "value"
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      },
      "type": [ {
        "code": "Extension"
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      "max": "*",
      "id": "Extension.extension",
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        "max": "*",
        "min": 0,
        "path": "Element.extension"
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      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension",
      "min": 0,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
      "type": [ {
        "code": "Extension"
      } ],
      "sliceName": "alertType",
      "max": "1",
      "id": "Extension.extension:alertType",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
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      "isSummary": false
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      "path": "Extension.extension.id",
      "min": 0,
      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:alertType.id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
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      "path": "Extension.extension.extension",
      "min": 0,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
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        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
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      },
      "type": [ {
        "code": "Extension"
      } ],
      "max": "0",
      "id": "Extension.extension:alertType.extension",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.url",
      "min": 1,
      "definition": "Source of the definition for the extension code - a logical name or a URL.",
      "isModifier": false,
      "short": "identifies the meaning of the extension",
      "fixedUri": "alertType",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "uri"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:alertType.url",
      "comment": "The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.",
      "base": {
        "max": "1",
        "min": 1,
        "path": "Extension.url"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x]",
      "min": 1,
      "definition": "The type of alerting system.",
      "isModifier": false,
      "short": "Value of extension",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "CodeableConcept"
      } ],
      "binding": {
        "strength": "extensible",
        "valueSet": "http://hl7.org/fhir/uv/phd/ValueSet/MDCValueSet"
      },
      "max": "1",
      "id": "Extension.extension:alertType.value[x]",
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        "max": "1",
        "min": 0,
        "path": "Extension.value[x]"
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      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
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      "path": "Extension.extension",
      "min": 1,
      "definition": "An Extension",
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      "short": "Extension",
      "type": [ {
        "code": "Extension"
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      "sliceName": "currentLimits",
      "max": "1",
      "id": "Extension.extension:currentLimits",
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        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.id",
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      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
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        "max": "1",
        "min": 0,
        "path": "Element.id"
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      "isSummary": false
    }, {
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        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension.extension",
      "min": 0,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
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        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
        } ]
      },
      "type": [ {
        "code": "Extension"
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      "max": "0",
      "id": "Extension.extension:currentLimits.extension",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.url",
      "min": 1,
      "definition": "Source of the definition for the extension code - a logical name or a URL.",
      "isModifier": false,
      "short": "identifies the meaning of the extension",
      "fixedUri": "currentLimits",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
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      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "uri"
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      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:currentLimits.url",
      "comment": "The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.",
      "base": {
        "max": "1",
        "min": 1,
        "path": "Extension.url"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "alerting-range-units",
        "human": "The units used should be equal.",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/uv/phd/StructureDefinition/SimpleAlerting",
        "severity": "warning",
        "expression": "low.code.exists() and high.code.exists() and low.code = high.code"
      } ],
      "path": "Extension.extension.value[x]",
      "min": 1,
      "definition": "Value of extension - must be one of a constrained set of the data types (see [Extensibility](http://hl7.org/fhir/R4/extensibility.html) for a list).",
      "isModifier": false,
      "short": "Value of extension",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
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      "type": [ {
        "code": "Range"
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      "max": "1",
      "id": "Extension.extension:currentLimits.value[x]",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Extension.value[x]"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.value[x].id",
      "min": 0,
      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension.value[x].extension",
      "min": 0,
      "definition": "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "isModifier": false,
      "short": "Additional content defined by implementations",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
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      "slicing": {
        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
        } ]
      },
      "type": [ {
        "code": "Extension"
      } ],
      "alias": [ "extensions", "user content" ],
      "max": "*",
      "id": "Extension.extension:currentLimits.value[x].extension",
      "comment": "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
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        "max": "*",
        "min": 0,
        "path": "Element.extension"
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      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].low",
      "min": 0,
      "definition": "The low limit. The boundary is inclusive.",
      "isModifier": false,
      "short": "Low limit",
      "mapping": [ {
        "map": "NR.1",
        "identity": "v2"
      }, {
        "map": "./low",
        "identity": "rim"
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      "type": [ {
        "code": "Quantity",
        "profile": [ "http://hl7.org/fhir/StructureDefinition/SimpleQuantity" ]
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].low",
      "comment": "If the low element is missing, the low boundary is not known.",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Range.low"
      },
      "isSummary": true
    }, {
      "path": "Extension.extension.value[x].low.id",
      "min": 0,
      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].low.id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension.value[x].low.extension",
      "min": 0,
      "definition": "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "isModifier": false,
      "short": "Additional content defined by implementations",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
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      "slicing": {
        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
        } ]
      },
      "type": [ {
        "code": "Extension"
      } ],
      "alias": [ "extensions", "user content" ],
      "max": "*",
      "id": "Extension.extension:currentLimits.value[x].low.extension",
      "comment": "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].low.value",
      "requirements": "Precision is handled implicitly in almost all cases of measurement.",
      "min": 0,
      "definition": "The value of the measured amount. The value includes an implicit precision in the presentation of the value.",
      "isModifier": false,
      "short": "Numerical value (with implicit precision)",
      "mapping": [ {
        "map": "SN.2  / CQ - N/A",
        "identity": "v2"
      }, {
        "map": "PQ.value, CO.value, MO.value, IVL.high or IVL.low depending on the value",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "decimal"
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].low.value",
      "comment": "The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.value"
      },
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].low.comparator",
      "requirements": "Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.",
      "min": 0,
      "definition": "Not allowed to be used in this context",
      "isModifier": true,
      "short": "< | <= | >= | > - how to understand the value",
      "mapping": [ {
        "map": "SN.1  / CQ.1",
        "identity": "v2"
      }, {
        "map": "IVL properties",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "code"
      } ],
      "meaningWhenMissing": "If there is no comparator, then there is no modification of the value",
      "binding": {
        "strength": "required",
        "valueSet": "http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName",
          "valueString": "QuantityComparator"
        } ],
        "description": "How the Quantity should be understood and represented."
      },
      "max": "0",
      "id": "Extension.extension:currentLimits.value[x].low.comparator",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.comparator"
      },
      "isModifierReason": "This is labeled as \"Is Modifier\" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value",
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].low.unit",
      "requirements": "There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.",
      "min": 0,
      "definition": "The units should be the same as the unit of the quantity this applies to.",
      "isModifier": false,
      "short": "Unit representation",
      "mapping": [ {
        "map": "(see OBX.6 etc.) / CQ.2",
        "identity": "v2"
      }, {
        "map": "PQ.unit",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "string"
      } ],
      "extension": [ {
        "url": "http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable",
        "valueBoolean": true
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].low.unit",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.unit"
      },
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].low.system",
      "requirements": "Need to know the system that defines the coded form of the unit.",
      "min": 0,
      "definition": "The identification of the system that provides the coded form of the unit.",
      "isModifier": false,
      "short": "System that defines coded unit form",
      "mapping": [ {
        "map": "(see OBX.6 etc.) / CQ.2",
        "identity": "v2"
      }, {
        "map": "CO.codeSystem, PQ.translation.codeSystem",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "uri"
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].low.system",
      "condition": [ "qty-3" ],
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.system"
      },
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].low.code",
      "requirements": "Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.",
      "min": 0,
      "definition": "A computer processable form of the unit in some unit representation system.",
      "isModifier": false,
      "short": "Coded form of the unit",
      "mapping": [ {
        "map": "(see OBX.6 etc.) / CQ.2",
        "identity": "v2"
      }, {
        "map": "PQ.code, MO.currency, PQ.translation.code",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "code"
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].low.code",
      "comment": "The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency.  The context of use may additionally require a code from a particular system.",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.code"
      },
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].high",
      "min": 0,
      "definition": "The high limit. The boundary is inclusive.",
      "isModifier": false,
      "short": "High limit",
      "mapping": [ {
        "map": "NR.2",
        "identity": "v2"
      }, {
        "map": "./high",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "Quantity",
        "profile": [ "http://hl7.org/fhir/StructureDefinition/SimpleQuantity" ]
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].high",
      "comment": "If the high element is missing, the high boundary is not known.",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Range.high"
      },
      "isSummary": true
    }, {
      "path": "Extension.extension.value[x].high.id",
      "min": 0,
      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].high.id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension.value[x].high.extension",
      "min": 0,
      "definition": "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "isModifier": false,
      "short": "Additional content defined by implementations",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "slicing": {
        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
        } ]
      },
      "type": [ {
        "code": "Extension"
      } ],
      "alias": [ "extensions", "user content" ],
      "max": "*",
      "id": "Extension.extension:currentLimits.value[x].high.extension",
      "comment": "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].high.value",
      "requirements": "Precision is handled implicitly in almost all cases of measurement.",
      "min": 0,
      "definition": "The value of the measured amount. The value includes an implicit precision in the presentation of the value.",
      "isModifier": false,
      "short": "Numerical value (with implicit precision)",
      "mapping": [ {
        "map": "SN.2  / CQ - N/A",
        "identity": "v2"
      }, {
        "map": "PQ.value, CO.value, MO.value, IVL.high or IVL.low depending on the value",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "decimal"
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].high.value",
      "comment": "The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.value"
      },
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].high.comparator",
      "requirements": "Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.",
      "min": 0,
      "definition": "Not allowed to be used in this context",
      "isModifier": true,
      "short": "< | <= | >= | > - how to understand the value",
      "mapping": [ {
        "map": "SN.1  / CQ.1",
        "identity": "v2"
      }, {
        "map": "IVL properties",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "code"
      } ],
      "meaningWhenMissing": "If there is no comparator, then there is no modification of the value",
      "binding": {
        "strength": "required",
        "valueSet": "http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName",
          "valueString": "QuantityComparator"
        } ],
        "description": "How the Quantity should be understood and represented."
      },
      "max": "0",
      "id": "Extension.extension:currentLimits.value[x].high.comparator",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.comparator"
      },
      "isModifierReason": "This is labeled as \"Is Modifier\" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value",
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].high.unit",
      "requirements": "There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.",
      "min": 0,
      "definition": "The units should be the same as the unit of the quantity this applies to.",
      "isModifier": false,
      "short": "Unit representation",
      "mapping": [ {
        "map": "(see OBX.6 etc.) / CQ.2",
        "identity": "v2"
      }, {
        "map": "PQ.unit",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "string"
      } ],
      "extension": [ {
        "url": "http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable",
        "valueBoolean": true
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].high.unit",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.unit"
      },
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].high.system",
      "requirements": "Need to know the system that defines the coded form of the unit.",
      "min": 0,
      "definition": "The identification of the system that provides the coded form of the unit.",
      "isModifier": false,
      "short": "System that defines coded unit form",
      "mapping": [ {
        "map": "(see OBX.6 etc.) / CQ.2",
        "identity": "v2"
      }, {
        "map": "CO.codeSystem, PQ.translation.codeSystem",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "uri"
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].high.system",
      "condition": [ "qty-3" ],
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.system"
      },
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x].high.code",
      "requirements": "Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.",
      "min": 0,
      "definition": "A computer processable form of the unit in some unit representation system.",
      "isModifier": false,
      "short": "Coded form of the unit",
      "mapping": [ {
        "map": "(see OBX.6 etc.) / CQ.2",
        "identity": "v2"
      }, {
        "map": "PQ.code, MO.currency, PQ.translation.code",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "code"
      } ],
      "max": "1",
      "id": "Extension.extension:currentLimits.value[x].high.code",
      "comment": "The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency.  The context of use may additionally require a code from a particular system.",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Quantity.code"
      },
      "isSummary": true
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension",
      "min": 1,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
      "type": [ {
        "code": "Extension"
      } ],
      "sliceName": "alertOperationalState",
      "max": "1",
      "id": "Extension.extension:alertOperationalState",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.id",
      "min": 0,
      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:alertOperationalState.id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension.extension",
      "min": 0,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
      "slicing": {
        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
        } ]
      },
      "type": [ {
        "code": "Extension"
      } ],
      "max": "0",
      "id": "Extension.extension:alertOperationalState.extension",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.url",
      "min": 1,
      "definition": "Source of the definition for the extension code - a logical name or a URL.",
      "isModifier": false,
      "short": "identifies the meaning of the extension",
      "fixedUri": "alertOperationalState",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "uri"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:alertOperationalState.url",
      "comment": "The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.",
      "base": {
        "max": "1",
        "min": 1,
        "path": "Extension.url"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x]",
      "min": 1,
      "definition": "The operational state of the alerting system.",
      "isModifier": false,
      "short": "Value of extension",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "CodeableConcept"
      } ],
      "binding": {
        "strength": "extensible",
        "valueSet": "http://hl7.org/fhir/uv/phd/ValueSet/SimpleAlertOperationalStates"
      },
      "max": "1",
      "id": "Extension.extension:alertOperationalState.value[x]",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Extension.value[x]"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension",
      "min": 0,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
      "type": [ {
        "code": "Extension"
      } ],
      "sliceName": "alertOperationalText",
      "max": "1",
      "id": "Extension.extension:alertOperationalText",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.id",
      "min": 0,
      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:alertOperationalText.id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension.extension",
      "min": 0,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
      "slicing": {
        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
        } ]
      },
      "type": [ {
        "code": "Extension"
      } ],
      "max": "0",
      "id": "Extension.extension:alertOperationalText.extension",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.url",
      "min": 1,
      "definition": "Source of the definition for the extension code - a logical name or a URL.",
      "isModifier": false,
      "short": "identifies the meaning of the extension",
      "fixedUri": "alertOperationalText",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "uri"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:alertOperationalText.url",
      "comment": "The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.",
      "base": {
        "max": "1",
        "min": 1,
        "path": "Extension.url"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x]",
      "min": 0,
      "definition": "A human readable description of the operational state of the alerting system.",
      "isModifier": false,
      "short": "Value of extension",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "string"
      } ],
      "max": "1",
      "id": "Extension.extension:alertOperationalText.value[x]",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Extension.value[x]"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension",
      "min": 0,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
      "type": [ {
        "code": "Extension"
      } ],
      "sliceName": "thresholdNotificationText",
      "max": "1",
      "id": "Extension.extension:thresholdNotificationText",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.id",
      "min": 0,
      "definition": "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "isModifier": false,
      "short": "Unique id for inter-element referencing",
      "mapping": [ {
        "map": "n/a",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:thresholdNotificationText.id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "Extension.extension.extension",
      "min": 0,
      "definition": "An Extension",
      "isModifier": false,
      "short": "Extension",
      "slicing": {
        "rules": "open",
        "description": "Extensions are always sliced by (at least) url",
        "discriminator": [ {
          "path": "url",
          "type": "value"
        } ]
      },
      "type": [ {
        "code": "Extension"
      } ],
      "max": "0",
      "id": "Extension.extension:thresholdNotificationText.extension",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "Extension.extension.url",
      "min": 1,
      "definition": "Source of the definition for the extension code - a logical name or a URL.",
      "isModifier": false,
      "short": "identifies the meaning of the extension",
      "fixedUri": "thresholdNotificationText",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "uri"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.extension:thresholdNotificationText.url",
      "comment": "The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.",
      "base": {
        "max": "1",
        "min": 1,
        "path": "Extension.url"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.extension.value[x]",
      "min": 0,
      "definition": "A human readable description of the threshold notification (DeviceAlert.label in FHIR R6).",
      "isModifier": false,
      "short": "Value of extension",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "string"
      } ],
      "max": "1",
      "id": "Extension.extension:thresholdNotificationText.value[x]",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Extension.value[x]"
      },
      "isSummary": false
    }, {
      "path": "Extension.url",
      "min": 1,
      "definition": "Source of the definition for the extension code - a logical name or a URL.",
      "isModifier": false,
      "short": "identifies the meaning of the extension",
      "fixedUri": "http://hl7.org/fhir/uv/phd/StructureDefinition/SimpleAlerting",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "uri"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "Extension.url",
      "comment": "The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.",
      "base": {
        "max": "1",
        "min": 1,
        "path": "Extension.url"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "Extension.value[x]",
      "min": 0,
      "definition": "Value of extension - must be one of a constrained set of the data types (see [Extensibility](http://hl7.org/fhir/R4/extensibility.html) for a list).",
      "isModifier": false,
      "short": "Value of extension",
      "mapping": [ {
        "map": "N/A",
        "identity": "rim"
      } ],
      "type": [ {
        "code": "base64Binary"
      }, {
        "code": "boolean"
      }, {
        "code": "canonical"
      }, {
        "code": "code"
      }, {
        "code": "date"
      }, {
        "code": "dateTime"
      }, {
        "code": "decimal"
      }, {
        "code": "id"
      }, {
        "code": "instant"
      }, {
        "code": "integer"
      }, {
        "code": "markdown"
      }, {
        "code": "oid"
      }, {
        "code": "positiveInt"
      }, {
        "code": "string"
      }, {
        "code": "time"
      }, {
        "code": "unsignedInt"
      }, {
        "code": "uri"
      }, {
        "code": "url"
      }, {
        "code": "uuid"
      }, {
        "code": "Address"
      }, {
        "code": "Age"
      }, {
        "code": "Annotation"
      }, {
        "code": "Attachment"
      }, {
        "code": "CodeableConcept"
      }, {
        "code": "Coding"
      }, {
        "code": "ContactPoint"
      }, {
        "code": "Count"
      }, {
        "code": "Distance"
      }, {
        "code": "Duration"
      }, {
        "code": "HumanName"
      }, {
        "code": "Identifier"
      }, {
        "code": "Money"
      }, {
        "code": "Period"
      }, {
        "code": "Quantity"
      }, {
        "code": "Range"
      }, {
        "code": "Ratio"
      }, {
        "code": "Reference"
      }, {
        "code": "SampledData"
      }, {
        "code": "Signature"
      }, {
        "code": "Timing"
      }, {
        "code": "ContactDetail"
      }, {
        "code": "Contributor"
      }, {
        "code": "DataRequirement"
      }, {
        "code": "Expression"
      }, {
        "code": "ParameterDefinition"
      }, {
        "code": "RelatedArtifact"
      }, {
        "code": "TriggerDefinition"
      }, {
        "code": "UsageContext"
      }, {
        "code": "Dosage"
      }, {
        "code": "Meta"
      } ],
      "max": "0",
      "id": "Extension.value[x]",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Extension.value[x]"
      },
      "isSummary": false
    } ],
    "extension": [ {
      "url": "http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version",
      "valueString": "4.0.1"
    } ]
  },
  "status": "active",
  "id": "5d0425cb-4852-47dd-a51a-9e32f6883b3b",
  "kind": "complex-type",
  "url": "http://hl7.org/fhir/uv/phd/StructureDefinition/SimpleAlerting",
  "context": [ {
    "type": "element",
    "expression": "Observation"
  }, {
    "type": "element",
    "expression": "DeviceMetric"
  }, {
    "type": "element",
    "expression": "Observation.component"
  } ],
  "version": "2.0.0-ballot2",
  "differential": {
    "element": [ {
      "id": "Extension",
      "max": "1",
      "path": "Extension",
      "short": "SimpleAlerting",
      "definition": "A simple set of parameters for basic alerting on numerical observed data."
    }, {
      "id": "Extension.extension",
      "min": 2,
      "path": "Extension.extension"
    }, {
      "id": "Extension.extension:alertType",
      "max": "1",
      "min": 0,
      "path": "Extension.extension",
      "sliceName": "alertType"
    }, {
      "id": "Extension.extension:alertType.extension",
      "max": "0",
      "path": "Extension.extension.extension"
    }, {
      "id": "Extension.extension:alertType.url",
      "path": "Extension.extension.url",
      "fixedUri": "alertType"
    }, {
      "id": "Extension.extension:alertType.value[x]",
      "min": 1,
      "path": "Extension.extension.value[x]",
      "type": [ {
        "code": "CodeableConcept"
      } ],
      "binding": {
        "strength": "extensible",
        "valueSet": "http://hl7.org/fhir/uv/phd/ValueSet/MDCValueSet"
      },
      "definition": "The type of alerting system."
    }, {
      "id": "Extension.extension:currentLimits",
      "max": "1",
      "min": 1,
      "path": "Extension.extension",
      "sliceName": "currentLimits"
    }, {
      "id": "Extension.extension:currentLimits.extension",
      "max": "0",
      "path": "Extension.extension.extension"
    }, {
      "id": "Extension.extension:currentLimits.url",
      "path": "Extension.extension.url",
      "fixedUri": "currentLimits"
    }, {
      "id": "Extension.extension:currentLimits.value[x]",
      "min": 1,
      "path": "Extension.extension.value[x]",
      "type": [ {
        "code": "Range"
      } ],
      "constraint": [ {
        "key": "alerting-range-units",
        "human": "The units used should be equal.",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/uv/phd/StructureDefinition/SimpleAlerting",
        "severity": "warning",
        "expression": "low.code.exists() and high.code.exists() and low.code = high.code"
      } ]
    }, {
      "id": "Extension.extension:currentLimits.value[x].low.unit",
      "path": "Extension.extension.value[x].low.unit",
      "definition": "The units should be the same as the unit of the quantity this applies to."
    }, {
      "id": "Extension.extension:currentLimits.value[x].high.unit",
      "path": "Extension.extension.value[x].high.unit",
      "definition": "The units should be the same as the unit of the quantity this applies to."
    }, {
      "id": "Extension.extension:alertOperationalState",
      "max": "1",
      "min": 1,
      "path": "Extension.extension",
      "sliceName": "alertOperationalState"
    }, {
      "id": "Extension.extension:alertOperationalState.extension",
      "max": "0",
      "path": "Extension.extension.extension"
    }, {
      "id": "Extension.extension:alertOperationalState.url",
      "path": "Extension.extension.url",
      "fixedUri": "alertOperationalState"
    }, {
      "id": "Extension.extension:alertOperationalState.value[x]",
      "min": 1,
      "path": "Extension.extension.value[x]",
      "type": [ {
        "code": "CodeableConcept"
      } ],
      "binding": {
        "strength": "extensible",
        "valueSet": "http://hl7.org/fhir/uv/phd/ValueSet/SimpleAlertOperationalStates"
      },
      "definition": "The operational state of the alerting system."
    }, {
      "id": "Extension.extension:alertOperationalText",
      "max": "1",
      "min": 0,
      "path": "Extension.extension",
      "sliceName": "alertOperationalText"
    }, {
      "id": "Extension.extension:alertOperationalText.extension",
      "max": "0",
      "path": "Extension.extension.extension"
    }, {
      "id": "Extension.extension:alertOperationalText.url",
      "path": "Extension.extension.url",
      "fixedUri": "alertOperationalText"
    }, {
      "id": "Extension.extension:alertOperationalText.value[x]",
      "path": "Extension.extension.value[x]",
      "type": [ {
        "code": "string"
      } ],
      "definition": "A human readable description of the operational state of the alerting system."
    }, {
      "id": "Extension.extension:thresholdNotificationText",
      "max": "1",
      "min": 0,
      "path": "Extension.extension",
      "sliceName": "thresholdNotificationText"
    }, {
      "id": "Extension.extension:thresholdNotificationText.extension",
      "max": "0",
      "path": "Extension.extension.extension"
    }, {
      "id": "Extension.extension:thresholdNotificationText.url",
      "path": "Extension.extension.url",
      "fixedUri": "thresholdNotificationText"
    }, {
      "id": "Extension.extension:thresholdNotificationText.value[x]",
      "path": "Extension.extension.value[x]",
      "type": [ {
        "code": "string"
      } ],
      "definition": "A human readable description of the threshold notification (DeviceAlert.label in FHIR R6)."
    }, {
      "id": "Extension.url",
      "path": "Extension.url",
      "fixedUri": "http://hl7.org/fhir/uv/phd/StructureDefinition/SimpleAlerting"
    }, {
      "id": "Extension.value[x]",
      "max": "0",
      "path": "Extension.value[x]"
    } ]
  },
  "contact": [ {
    "telecom": [ {
      "value": "http://www.hl7.org/Special/committees/healthcaredevices",
      "system": "url"
    } ]
  } ],
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension"
}