odata2-lib/odata-client-core/src/main/java/org/apache/olingo/odata2/client/core/ep/deserializer/XmlErrorDocumentDeserializer.java [91:126]:
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  private ODataErrorContext parserError(final XMLStreamReader reader)
      throws XMLStreamException, EntityProviderException {
    // read xml tag
    reader.require(XMLStreamConstants.START_DOCUMENT, null, null);
    reader.nextTag();

    // read error tag
    reader.require(XMLStreamConstants.START_ELEMENT, Edm.NAMESPACE_M_2007_08, FormatXml.M_ERROR);

    // read error data
    boolean codeFound = false;
    boolean messageFound = false;
    ODataErrorContext errorContext = new ODataErrorContext();
    while (notFinished(reader)) {
      reader.nextTag();
      if (reader.isStartElement()) {
        String name = reader.getLocalName();
        if (FormatXml.M_CODE.equals(name)) {
          codeFound = true;
          handleCode(reader, errorContext);
        } else if (FormatXml.M_MESSAGE.equals(name)) {
          messageFound = true;
          handleMessage(reader, errorContext);
        } else if (FormatXml.M_INNER_ERROR.equals(name)) {
          handleInnerError(reader, errorContext);
        } else {
          throw new EntityProviderException(
              EntityProviderException.INVALID_CONTENT.addContent(name, FormatXml.M_ERROR));
        }
      }
    }
    validate(codeFound, messageFound);

    errorContext.setContentType(ContentType.APPLICATION_XML.toContentTypeString());
    return errorContext;
  }
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odata2-lib/odata-core/src/main/java/org/apache/olingo/odata2/core/ep/consumer/XmlErrorDocumentConsumer.java [91:126]:
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  private ODataErrorContext parserError(final XMLStreamReader reader)
      throws XMLStreamException, EntityProviderException {
    // read xml tag
    reader.require(XMLStreamConstants.START_DOCUMENT, null, null);
    reader.nextTag();

    // read error tag
    reader.require(XMLStreamConstants.START_ELEMENT, Edm.NAMESPACE_M_2007_08, FormatXml.M_ERROR);

    // read error data
    boolean codeFound = false;
    boolean messageFound = false;
    ODataErrorContext errorContext = new ODataErrorContext();
    while (notFinished(reader)) {
      reader.nextTag();
      if (reader.isStartElement()) {
        String name = reader.getLocalName();
        if (FormatXml.M_CODE.equals(name)) {
          codeFound = true;
          handleCode(reader, errorContext);
        } else if (FormatXml.M_MESSAGE.equals(name)) {
          messageFound = true;
          handleMessage(reader, errorContext);
        } else if (FormatXml.M_INNER_ERROR.equals(name)) {
          handleInnerError(reader, errorContext);
        } else {
          throw new EntityProviderException(
              EntityProviderException.INVALID_CONTENT.addContent(name, FormatXml.M_ERROR));
        }
      }
    }
    validate(codeFound, messageFound);

    errorContext.setContentType(ContentType.APPLICATION_XML.toContentTypeString());
    return errorContext;
  }
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