Resolve paths in CSDL XML documents

[HeikoTheissen]

Given an augmented CSDL XML document like

<Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" id="d156aAcA" Namespace="Resolved.Paths" Alias="self">
   <EntityType id="d156aAcAa" Name="Order">
      <Key id="d156aAcAaA">
         <PropertyRef id="d156aAcAaAa" Name="ID" p1:Name="d156aAcAaB"/>
      </Key>
      <Property id="d156aAcAaB" Name="ID" Type="Edm.String"/>
      <Property id="d156aAcAaC" Name="Unit" Type="Edm.String">
         <Annotation id="d156aAcAaCa" target="d156aAcAaC" Term="Core.Immutable" p2:Term="Org.OData.Core.V1.Immutable"/>
      </Property>
      <NavigationProperty id="d156aAcAaD" Name="Items" Type="Collection(self.OrderItem)" p1:Type="d156aAcAb"/>
   </EntityType>
   <EntityType id="d156aAcAb" Name="OrderItem">
      <Key id="d156aAcAbA">
         <PropertyRef id="d156aAcAbAa" Name="ID" p1:Name="d156aAcAbB"/>
      </Key>
      <Property id="d156aAcAbB" Name="ID" Type="Edm.String" Nullable="false"/>
      <Property id="d156aAcAbC" Name="Text" Type="Edm.String"/>
      <Property id="d156aAcAbD" Name="Quantity" Type="Edm.Decimal">
         <Annotation id="d156aAcAbDa" target="d156aAcAbD" Term="Measures.Unit" p2:Term="Org.OData.Measures.V1.Unit" Path="Header/Unit" p0:Path="d156aAcAbE" p1:Path="d156aAcAaC"/>
      </Property>
      <NavigationProperty id="d156aAcAbE" Name="Header" Type="self.Order" p1:Type="d156aAcAa"/>
   </EntityType>
   <EntityContainer id="d156aAcAc" Name="Container">
      <EntitySet id="d156aAcAcA" Name="Orders" EntityType="self.Order" p1:EntityType="d156aAcAa"/>
      <EntitySet id="d156aAcAcB" Name="OrderItems" EntityType="self.OrderItem" p1:EntityType="d156aAcAb">
         <NavigationPropertyBinding id="d156aAcAcBa" Path="Header" p1:Path="d156aAcAbE" Target="Orders" p1:Target="d156aAcAcA"/>
      </EntitySet>
   </EntityContainer>
   <Annotations id="d156aAcAd" Target="self.OrderItem/ID" p0:Target="d156aAcAb" p1:Target="d156aAcAbB">
      <Annotation id="d156aAcAdA" target="d156aAcAbB" Term="Core.Description" p2:Term="Org.OData.Core.V1.Description">
         <Path id="d156aAcAdAa" p0:Path="d156aAcAbD" p2:Path="Org.OData.Measures.V1.Unit">Quantity/@Measures.Unit</Path>
      </Annotation>
   </Annotations>
</Schema>

an immutable property can still be part of the PATCH payload if it is the target of a Measures.Unit annotation, and this can be checked with an XPath expression like

odata-openapi/tools/V4-CSDL-to-OpenAPI.xsl

Lines 1535 to 1537 in 9421df9

	@id=//edm:Annotation[@p2:Term='Org.OData.Core.V1.Immutable']/@target
	and not(@id=//edm:Annotation[@p2:Term='Org.OData.Measures.V1.Unit'
	or @p2:Term='Org.OData.Measures.V1.ISOCurrency']//@p1:*)

See the result here.