odata2-lib/odata-client-core/src/main/java/org/apache/olingo/odata2/client/core/ep/serializer/AtomEntryEntitySerializer.java [464:507]:
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  private void appendAtomOptionalParts(final XMLStreamWriter writer, final EntityInfoAggregator eia,
      final Map<String, Object> data) throws EntityProviderException {
    try {
      String authorEmail = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_AUTHOREMAIL, data);
      String authorName = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_AUTHORNAME, data);
      String authorUri = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_AUTHORURI, data);
      if (authorEmail != null || authorName != null || authorUri != null) {
        writer.writeStartElement(FormatXml.ATOM_AUTHOR);
        appendAtomOptionalPart(writer, FormatXml.ATOM_AUTHOR_NAME, authorName, false);
        appendAtomOptionalPart(writer, FormatXml.ATOM_AUTHOR_EMAIL, authorEmail, false);
        appendAtomOptionalPart(writer, FormatXml.ATOM_AUTHOR_URI, authorUri, false);
        writer.writeEndElement();
      }

      String summary = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_SUMMARY, data);
      appendAtomOptionalPart(writer, FormatXml.ATOM_SUMMARY, summary, true);

      String contributorName = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_CONTRIBUTORNAME, data);
      String contributorEmail = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_CONTRIBUTOREMAIL, data);
      String contributorUri = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_CONTRIBUTORURI, data);
      if (contributorEmail != null || contributorName != null || contributorUri != null) {
        writer.writeStartElement(FormatXml.ATOM_CONTRIBUTOR);
        appendAtomOptionalPart(writer, FormatXml.ATOM_CONTRIBUTOR_NAME, contributorName, false);
        appendAtomOptionalPart(writer, FormatXml.ATOM_CONTRIBUTOR_EMAIL, contributorEmail, false);
        appendAtomOptionalPart(writer, FormatXml.ATOM_CONTRIBUTOR_URI, contributorUri, false);
        writer.writeEndElement();
      }

      String rights = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_RIGHTS, data);
      appendAtomOptionalPart(writer, FormatXml.ATOM_RIGHTS, rights, true);
      String published = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_PUBLISHED, data);
      appendAtomOptionalPart(writer, FormatXml.ATOM_PUBLISHED, published, false);

      String term = eia.getEntityType().getNamespace() + Edm.DELIMITER + eia.getEntityType().getName();
      writer.writeStartElement(FormatXml.ATOM_CATEGORY);
      writer.writeAttribute(FormatXml.ATOM_CATEGORY_TERM, term);
      writer.writeAttribute(FormatXml.ATOM_CATEGORY_SCHEME, Edm.NAMESPACE_SCHEME_2007_08);
      writer.writeEndElement();
    } catch (XMLStreamException e) {
      throw new EntityProviderProducerException(EntityProviderException.COMMON, e);
    } catch (EdmException e) {
      throw new EntityProviderProducerException(e.getMessageReference(), e);
    }
  }
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odata2-lib/odata-core/src/main/java/org/apache/olingo/odata2/core/ep/producer/AtomEntryEntityProducer.java [527:570]:
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  private void appendAtomOptionalParts(final XMLStreamWriter writer, final EntityInfoAggregator eia,
      final Map<String, Object> data) throws EntityProviderException {
    try {
      String authorEmail = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_AUTHOREMAIL, data);
      String authorName = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_AUTHORNAME, data);
      String authorUri = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_AUTHORURI, data);
      if (authorEmail != null || authorName != null || authorUri != null) {
        writer.writeStartElement(FormatXml.ATOM_AUTHOR);
        appendAtomOptionalPart(writer, FormatXml.ATOM_AUTHOR_NAME, authorName, false);
        appendAtomOptionalPart(writer, FormatXml.ATOM_AUTHOR_EMAIL, authorEmail, false);
        appendAtomOptionalPart(writer, FormatXml.ATOM_AUTHOR_URI, authorUri, false);
        writer.writeEndElement();
      }

      String summary = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_SUMMARY, data);
      appendAtomOptionalPart(writer, FormatXml.ATOM_SUMMARY, summary, true);

      String contributorName = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_CONTRIBUTORNAME, data);
      String contributorEmail = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_CONTRIBUTOREMAIL, data);
      String contributorUri = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_CONTRIBUTORURI, data);
      if (contributorEmail != null || contributorName != null || contributorUri != null) {
        writer.writeStartElement(FormatXml.ATOM_CONTRIBUTOR);
        appendAtomOptionalPart(writer, FormatXml.ATOM_CONTRIBUTOR_NAME, contributorName, false);
        appendAtomOptionalPart(writer, FormatXml.ATOM_CONTRIBUTOR_EMAIL, contributorEmail, false);
        appendAtomOptionalPart(writer, FormatXml.ATOM_CONTRIBUTOR_URI, contributorUri, false);
        writer.writeEndElement();
      }

      String rights = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_RIGHTS, data);
      appendAtomOptionalPart(writer, FormatXml.ATOM_RIGHTS, rights, true);
      String published = getTargetPathValue(eia, EdmTargetPath.SYNDICATION_PUBLISHED, data);
      appendAtomOptionalPart(writer, FormatXml.ATOM_PUBLISHED, published, false);

      String term = eia.getEntityType().getNamespace() + Edm.DELIMITER + eia.getEntityType().getName();
      writer.writeStartElement(FormatXml.ATOM_CATEGORY);
      writer.writeAttribute(FormatXml.ATOM_CATEGORY_TERM, term);
      writer.writeAttribute(FormatXml.ATOM_CATEGORY_SCHEME, Edm.NAMESPACE_SCHEME_2007_08);
      writer.writeEndElement();
    } catch (XMLStreamException e) {
      throw new EntityProviderProducerException(EntityProviderException.COMMON, e);
    } catch (EdmException e) {
      throw new EntityProviderProducerException(e.getMessageReference(), e);
    }
  }
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