<?xml version="1.0" encoding="UTF-8"?>
<sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
  <sch:ns prefix="f" uri="http://hl7.org/fhir"/>
  <sch:ns prefix="h" uri="http://www.w3.org/1999/xhtml"/>
  <!-- 
    This file contains just the constraints for the resource Citation
    It is provided for documentation purposes. When actually validating,
    always use fhir-invariants.sch (because of the way containment works)
    Alternatively you can use this file to build a smaller version of
    fhir-invariants.sch (the contents are identical; only include those 
    resources relevant to your implementation).
  -->
  <sch:pattern>
    <sch:title>Global</sch:title>
    <sch:rule context="f:extension">
      <sch:assert test="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])">ext-1: Must have either extensions or value[x], not both</sch:assert>
    </sch:rule>
    <sch:rule context="f:modifierExtension">
      <sch:assert test="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])">ext-1: Must have either extensions or value[x], not both</sch:assert>
    </sch:rule>
  </sch:pattern>
  <sch:pattern>
    <sch:title>Global 1</sch:title>
    <sch:rule context="f:*">
      <sch:assert test="@value|f:*|h:div">global-1: All FHIR elements must have a @value or children</sch:assert>
    </sch:rule>
  </sch:pattern>
</sch:schema>
