Create ext-R5-Dosage.maxDosePerPeriod.json

examples/UKCore-Dosage-maxDosePerPeriodR5.xml

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+<Dosage xmlns="http://hl7.org/fhir">
+    <maxDosagePerPeriod>
+        <valueRatio>
+            <numerator>
+                <value value="10" />
+                <unit value="mg" />
+            </numerator>
+            <denominator>
+                <value value="2" />
+                <unit value="hour" />
+            </denominator>
+        </valueRatio>
+    </maxDosagePerPeriod>
+    <extension url="http://hl7.org/fhir/5.0/StructureDefinition/extension-Dosage.maxDosePerPeriod">
+        <valueRatio>
+            <numerator>
+                <value value="20" />
+                <unit value="mg" />
+            </numerator>
+            <denominator>
+                <value value="1" />
+                <unit value="day" />
+            </denominator>
+        </valueRatio>
+    </extension>
+</Dosage>

structuredefinitions/ext-R5-Dosage.maxDosePerPeriod.json

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+{
+  "resourceType": "StructureDefinition",
+  "id": "ext-R5-Dosage.maxDosePerPeriod",
+  "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Dosage.maxDosePerPeriod",
+  "version": "0.0.1-snapshot-1",
+  "name": "ext_R5_Dosage_maxDosePerPeriod",
+  "title": "Cross-version Extension for R5.Dosage.maxDosePerPeriod for use in FHIR R4",
+  "status": "draft",
+  "experimental": false,
+  "date": "2025-06-03T03:14:49.693128+02:00",
+  "description": "This cross-version extension represents Dosage.maxDosePerPeriod from http://hl7.org/fhir/StructureDefinition/Dosage|5.0.0 for use in FHIR R4.",
+  "fhirVersion": "4.0.1",
+  "kind": "complex-type",
+  "abstract": false,
+  "context": [
+    {
+      "type": "element",
+      "expression": "Dosage.maxDosePerPeriod"
+    }
+  ],
+  "type": "Extension",
+  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
+  "derivation": "constraint",
+  "differential": {
+    "element": [
+      {
+        "id": "Extension",
+        "path": "Extension",
+        "short": "Upper limit on medication per unit of time",
+        "definition": "`Dosage.maxDosePerPeriod` maps to R4 `Dosage.maxDosePerPeriod`. So is mapped as Equivalent.",
+        "isModifier": false
+      },
+      {
+        "id": "Extension.extension",
+        "path": "Extension.extension",
+        "max": "0"
+      },
+      {
+        "id": "Extension.url",
+        "path": "Extension.url",
+        "fixedUri": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Dosage.maxDosePerPeriod"
+      },
+      {
+        "id": "Extension.value[x]",
+        "path": "Extension.value[x]",
+        "short": "Upper limit on medication per unit of time",
+        "definition": "`Dosage.maxDosePerPeriod` maps to R4 `Dosage.maxDosePerPeriod`. So is mapped as Equivalent.",
+        "type": [
+          {
+            "code": "Ratio"
+          }
+        ]
+      }
+    ]
+  }
+}