<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="image-box-coordinates" />
  <url value="http://omi.de/fhir/registry/StructureDefinition/image-box-coordinates" />
  <version value="0.3.26" />
  <name value="ImageBoxCoordinatesExtension" />
  <title value="Image Box Coordinates" />
  <status value="active" />
  <date value="2024-12-11" />
  <publisher value="MOLIT gGmbH" />
  <description value="Stores the four numerical coordinates (x1, y1, x2, y2) defining a rectangular box on an image" />
  <fhirVersion value="4.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="Observation.component" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="Image Box Coordinates" />
      <definition value="Stores the four numerical coordinates (x1, y1, x2, y2) defining a rectangular box on an image" />
    </element>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <min value="4" />
    </element>
    <element id="Extension.extension:x1">
      <path value="Extension.extension" />
      <sliceName value="x1" />
      <short value="X coordinate of top-left corner" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension:x1.extension">
      <path value="Extension.extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.extension:x1.url">
      <path value="Extension.extension.url" />
      <fixedUri value="x1" />
    </element>
    <element id="Extension.extension:x1.value[x]">
      <path value="Extension.extension.value[x]" />
      <type>
        <code value="decimal" />
      </type>
    </element>
    <element id="Extension.extension:y1">
      <path value="Extension.extension" />
      <sliceName value="y1" />
      <short value="Y coordinate of top-left corner" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension:y1.extension">
      <path value="Extension.extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.extension:y1.url">
      <path value="Extension.extension.url" />
      <fixedUri value="y1" />
    </element>
    <element id="Extension.extension:y1.value[x]">
      <path value="Extension.extension.value[x]" />
      <type>
        <code value="decimal" />
      </type>
    </element>
    <element id="Extension.extension:x2">
      <path value="Extension.extension" />
      <sliceName value="x2" />
      <short value="X coordinate of bottom-right corner" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension:x2.extension">
      <path value="Extension.extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.extension:x2.url">
      <path value="Extension.extension.url" />
      <fixedUri value="x2" />
    </element>
    <element id="Extension.extension:x2.value[x]">
      <path value="Extension.extension.value[x]" />
      <type>
        <code value="decimal" />
      </type>
    </element>
    <element id="Extension.extension:y2">
      <path value="Extension.extension" />
      <sliceName value="y2" />
      <short value="Y coordinate of bottom-right corner" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension:y2.extension">
      <path value="Extension.extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.extension:y2.url">
      <path value="Extension.extension.url" />
      <fixedUri value="y2" />
    </element>
    <element id="Extension.extension:y2.value[x]">
      <path value="Extension.extension.value[x]" />
      <type>
        <code value="decimal" />
      </type>
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://omi.de/fhir/registry/StructureDefinition/image-box-coordinates" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>