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IEdmModel model;
Func<Uri, XmlReader> getReferencedSchemaFunc = uri =>
{
  return XmlReader.Create(GetModelStream(uri));
};

ODataMessageReaderSettings readerSettings = new ODataMessageReaderSettings() { BaseUri = new Uri(ServiceBaseUri) };
using (var msgReader = new ODataMessageReader((IODataResponseMessage)message, readerSettings))
{
  model = msgReader.ReadMetadataDocument(getReferencedSchemaFunc);

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using (var msgWriter = new ODataMessageWriter((IODataResponseMessage)message, writerSettings, mainModel))
{
  msgWriter.WriteMetadataDocument();
}

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IEdmModel model;
Func<Uri, XmlReader> getReferencedSchemaFunc = uri =>
{
  if (uri.AbsoluteUri.EndsWith("ReferencedModel.csdl"))
  {
    return XmlReader.Create(File.Open("ReferencedModel.csdl", FileMode.Open));
  }
  else
  {
    return null;

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EdmReference refModel = new EdmReference(string.Format("{0}ReferencedModel.csdl", ServiceBaseUri));
refModel.AddInclude(new EdmInclude("RefModel", "SampleCode.ReferencedModel"));
mainModel.SetEdmReferences(new IEdmReference[] { refModel });

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EdmModel mainModel = new EdmModel();
var mainContainer = new EdmEntityContainer(mainNS, "MainContainer");            

var customerType = new EdmEntityType(mainNS, "Customer", (IEdmEntityType)personType);
customerType.AddProperty(new EdmStructuralProperty(customerType, "HomeAddress", new EdmComplexTypeReference((IEdmComplexType)addressType, true)));
mainModel.AddElement(customerType);

var customerSet = new EdmEntitySet(mainContainer, "Customers", customerType);
mainContainer.AddElement(customerSet);
mainModel.AddElement(mainContainer);

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IEnumerable<IEdmOperation> FindDeclaredBoundOperations(string qualifiedName, IEdmType bindingType);
IEnumerable<IEdmOperation> FindDeclaredOperations(string qualifiedName);
IEdmValueTerm FindDeclaredValueTerm(string qualifiedName);
IEnumerable<IEdmVocabularyAnnotation> FindDeclaredVocabularyAnnotations(IEdmVocabularyAnnotatable element);

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var addressType = referencedModel.FindDeclaredType(string.Format("{0}.Address", refNS));
var personType = referencedModel.FindDeclaredType(string.Format("{0}.Person", refNS));

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IEdmModel referencedModel;
using (Stream csdlStream = File.Open("ReferencedModel.csdl", FileMode.Open))
{
  bool parseResult;
  IEnumerable<EdmError> errors;
  parseResult = EdmxReader.TryParse(XmlReader.Create(csdlStream), out referencedModel, out errors);
  if (!parseResult)
  {
    throw new InvalidOperationException("Failed to load model : " + string.Join(Environment.NewLine, errors.Select(e => e.ErrorMessage)));
  }

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<?xml version="1.0" encoding="utf-8"?>
<edmx:Edmx Version="4.0" xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx">
  <edmx:Reference Uri="http://www.example.com/ReferencedModel.csdl">
    <edmx:Include Namespace="SampleCode.ReferencedModel" Alias="RefModel" />
  </edmx:Reference>
  <edmx:DataServices>
    <Schema Namespace="SampleCode.MainModel" xmlns="http://docs.oasis-open.org/odata/ns/edm">
      <EntityType Name="Customer" BaseType="SampleCode.ReferencedModel.Person">
        <Property Name="HomeAddress" Type="SampleCode.ReferencedModel.Address" />
      </EntityType>

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<edmx:Edmx xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx" Version="4.0">
  <edmx:DataServices>
    <Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="SampleCode.ReferencedModel">
      <ComplexType Name="Address">
        <Property Type="Edm.String" Name="Street" Nullable="false"/>
        <Property Type="Edm.String" Name="City" Nullable="false"/>
        <Property Type="Edm.String" Name="PostalCode" Nullable="false"/>
      </ComplexType>
      <EntityType Name="Person">
        <Key>