odata2-annotation-processor/annotation-processor-core/src/main/java/org/apache/olingo/odata2/annotation/processor/core/ListsProcessor.java [923:936]:
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  private <T> String constructETag(final EdmEntitySet entitySet, final T data) throws ODataException {
    final EdmEntityType entityType = entitySet.getEntityType();
    String eTag = null;
    for (final String propertyName : entityType.getPropertyNames()) {
      final EdmProperty property = (EdmProperty) entityType.getProperty(propertyName);
      if (property.getFacets() != null && property.getFacets().getConcurrencyMode() == EdmConcurrencyMode.Fixed) {
        final EdmSimpleType type = (EdmSimpleType) property.getType();
        final String component = type.valueToString(valueAccess.getPropertyValue(data, property),
            EdmLiteralKind.DEFAULT, property.getFacets());
        eTag = eTag == null ? component : eTag + Edm.DELIMITER + component;
      }
    }
    return eTag == null ? null : "W/\"" + eTag + "\"";
  }
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odata2-lib/odata-ref/src/main/java/org/apache/olingo/odata2/ref/processor/ListsProcessor.java [933:946]:
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  private <T> String constructETag(final EdmEntitySet entitySet, final T data) throws ODataException {
    final EdmEntityType entityType = entitySet.getEntityType();
    String eTag = null;
    for (final String propertyName : entityType.getPropertyNames()) {
      final EdmProperty property = (EdmProperty) entityType.getProperty(propertyName);
      if (property.getFacets() != null && property.getFacets().getConcurrencyMode() == EdmConcurrencyMode.Fixed) {
        final EdmSimpleType type = (EdmSimpleType) property.getType();
        final String component = type.valueToString(valueAccess.getPropertyValue(data, property),
            EdmLiteralKind.DEFAULT, property.getFacets());
        eTag = eTag == null ? component : eTag + Edm.DELIMITER + component;
      }
    }
    return eTag == null ? null : "W/\"" + eTag + "\"";
  }
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