code: public Set<ElementDescriptor<?>> getProperties()
  	{
  		if (mPropStatByProperty == null)
  		{
  			return null;
  		}
  
  		return Collections.unmodifiableSet(mPropStatByProperty.keySet());
  	}
docs: Get the {@link Set} of {@link XmlElementDescriptor}s of all properties in this response.
  
  @return An unmodifiable {@link Set} of {@link XmlElementDescriptor}s, may be <code>null</code> or empty if there are no properties in this response.