private void writeProperty(
     StreamWriter writer, EntityMetadata entityMetadata, EntityProperty property) {
   String elementText = entityMetadata.getPropertyValueAsString(property);
   writer.startElement(new QName(d, property.getName(), "d"));
   EdmType type =
       MetadataOData4j.termValueToEdmType(
           entityMetadata.getTermValue(property.getFullyQualifiedName(), TermValueType.TERM_NAME));
   boolean isNullable = entityMetadata.isPropertyNullable(property.getFullyQualifiedName());
   // Append Type Attribute
   if (!type.equals(EdmSimpleType.STRING)) {
     writer.writeAttribute(new QName(m, "type", "m"), type.getFullyQualifiedTypeName());
   }
   // Append Null attribute
   if (isNullable && (elementText.isEmpty()) && !type.equals(EdmSimpleType.STRING)) {
     writer.writeAttribute(new QName(m, "null", "m"), "true");
   }
   // Write the property text
   if (type.equals(EdmSimpleType.DATETIME) && !elementText.isEmpty()) {
     // Write dates in UTC format
     SimpleDateFormat formatUTC = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
     formatUTC.setTimeZone(TimeZone.getTimeZone("UTC"));
     writer.writeElementText(formatUTC.format((Date) property.getValue()));
   } else if (elementText != null) {
     writer.writeElementText(elementText);
   }
   writer.endElement();
 }
 private String getAbsoluteId(
     String baseUri, String entitySetName, Entity entity, EntityMetadata entityMetadata) {
   String absId = "";
   for (String key : entityMetadata.getIdFields()) {
     EntityProperty prop =
         entity.getProperties().getProperty(entityMetadata.getSimplePropertyName(key));
     if (prop != null) {
       absId +=
           absId.isEmpty()
               ? (!baseUri.endsWith("/") ? baseUri + "/" : baseUri) + entitySetName
               : ",";
       if (entityMetadata.isPropertyNumber(prop.getFullyQualifiedName())) {
         absId += "(" + entityMetadata.getPropertyValueAsString(prop) + ")";
       } else {
         absId += "('" + entityMetadata.getPropertyValueAsString(prop) + "')";
       }
     }
   }
   return absId;
 }