StructureDefinition for canonical

<?xml version="1.0" encoding="UTF-8"?>

<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="canonical"/> 
  <text> 
    <status value="generated"/> 
    <div xmlns="http://www.w3.org/1999/xhtml">to do</div> 
  </text> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="normative"/> 
  </extension> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version">
    <valueCode value="4.0.0"/> 
  </extension> 
  <url value="http://hl7.org/fhir/StructureDefinition/canonical"/> 
  

  <version value="5.0.0-snapshot3"/> 
  <name value="canonical"/> 
  <status value="active"/> 
  <experimental value="false"/> 
  

  <date value="2022-12-14T07:12:54+11:00"/> 
  <publisher value="HL7 FHIR Standard"/> 
  <contact> 
    <telecom> 
      <system value="url"/> 
      <value value="http://hl7.org/fhir"/> 
    </telecom> 
  </contact> 
  Base StructureDefinition for canonical type: A URI that is a reference to a canonical
   URL on a FHIR resource
  

  <description value="canonical type: A URI that is a reference to a canonical URL on a FHIR resource"/> 
  <jurisdiction> 
    <coding> 
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> 
      <code value="001"/> 
      <display value="World"/> 
    </coding> 
  </jurisdiction> 
  <fhirVersion value="5.0.0-snapshot3"/> 
  <kind value="primitive-type"/> 
  <abstract value="false"/> 
  <type value="canonical"/> 
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/uri"/> 
  <derivation value="specialization"/> 
  <snapshot> 
    <element id="canonical">
      <path value="canonical"/> 
      <short value="Primitive Type canonical"/> 
      <definition value="A URI that is a reference to a canonical URL on a FHIR resource"/> 
      <comment value="see [Canonical References](references.html#canonical)"/> 
      <min value="0"/> 
      <max value="*"/> 
      <base> 
        <path value="canonical"/> 
        <min value="0"/> 
        <max value="*"/> 
      </base> 
      <constraint> 
        <key value="ele-1"/> 
        <severity value="error"/> 
        
        
        

        <human value="All FHIR elements must have a @value or children"/> 
        <expression value="hasValue() or (children().count() &gt; id.count())"/> 
        <source value="http://hl7.org/fhir/StructureDefinition/Element"/> 
      </constraint> 
      <isModifier value="false"/> 
      <isSummary value="false"/> 
    </element> 
    <element id="canonical.id">
      <path value="canonical.id"/> 
      <representation value="xmlAttr"/> 
      <short value="xml:id (or equivalent in JSON)"/> 
      <definition value="unique id for the element within a resource (for internal references)"/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="Element.id"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <!--  Note: special primitive values have a FHIRPath system type. e.g. this is compiler
       magic (h)  -->

      <type> 
        <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type">
          <valueUrl value="string"/> 
        </extension> 
        <code value="http://hl7.org/fhirpath/System.String"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="false"/> 
    </element> 
    <element id="canonical.extension">
      <path value="canonical.extension"/> 
      <short value="Additional content defined by implementations"/> 
      <definition value="May be used to represent additional information that is not part of the basic definition
       of the resource. 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.
      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.

       of the resource. 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."/> 
      <comment value="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."/> 

      <alias value="extensions"/> 
      <alias value="user content"/> 
      <min value="0"/> 
      <max value="*"/> 
      <base> 
        <path value="Element.extension"/> 
        <min value="0"/> 
        <max value="*"/> 
      </base> 
      <type> 
        <code value="Extension"/> 
      </type> 
      <constraint> 
        <key value="ele-1"/> 
        <severity value="error"/> 
        <human value="All FHIR elements must have a @value or children"/> 
        <expression value="hasValue() or (children().count() &gt; id.count())"/> 
        

        <source value="http://hl7.org/fhir/StructureDefinition/Element"/> 
      </constraint> 
      <constraint> 
        <key value="ext-1"/> 
        <severity value="error"/> 
        <human value="Must have either extensions or value[x], not both"/> 
        <expression value="extension.exists() != value.exists()"/> 
        

        <source value="http://hl7.org/fhir/StructureDefinition/Extension"/> 
      </constraint> 
      <isModifier value="false"/> 
      <isSummary value="false"/> 
    </element> 
    <element id="canonical.value">
      <path value="canonical.value"/> 
      <representation value="xmlAttr"/> 
      <short value="Primitive value for canonical"/> 
      <definition value="Primitive value for canonical"/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="uri.value"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <!--  Note: special primitive values have a FHIRPath system type. e.g. this is compiler
       magic (i)  -->

      <type> 
        <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type">
          <valueUrl value="canonical"/> 
        </extension> 
        <extension url="http://hl7.org/fhir/StructureDefinition/regex">
          <valueString value="\S*"/> 
        </extension> 
        <code value="http://hl7.org/fhirpath/System.String"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="false"/> 
    </element> 
  </snapshot> 
  <differential> 
    <element id="canonical">
      <path value="canonical"/> 
      <short value="Primitive Type canonical"/> 
      <definition value="A URI that is a reference to a canonical URL on a FHIR resource"/> 
      <comment value="see [Canonical References](references.html#canonical)"/> 
      <min value="0"/> 
      <max value="*"/> 
    </element> 
    <element id="canonical.value">
      <path value="canonical.value"/> 
      <representation value="xmlAttr"/> 
      <short value="Primitive value for canonical"/> 
      <definition value="Primitive value for canonical"/> 
      <min value="0"/> 
      <max value="1"/> 
      <!--  Note: special primitive values have a FHIRPath system type. e.g. this is compiler
       magic (g)  -->

      <type> 
        <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type">
          <valueUrl value="canonical"/> 
        </extension> 
        <extension url="http://hl7.org/fhir/StructureDefinition/regex">
          <valueString value="\S*"/> 
        </extension> 
        <code value="http://hl7.org/fhirpath/System.String"/> 
      </type> 
    </element> 
  </differential> 


</

StructureDefinition

>