Bug 130492 Provide a method to serialize the report with library information.
Currently, when engine generate the report document file, the document does not contain any library information. That will cause many propblem on server side. Model should provide a method to serialize the report with library information to a stream so that the generated report document can contain all information that the report need.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
return mask.getMask( );
				}
			}
			e = e.getExtendsElement( );
		} while ( e != null );
		return null;
	}
	/**
	 * Implements to cache a back-pointer from a referenced element. This
	 * element has an element reference property that can point to another
	 * "referencable" element. To maintain semantic consistency, the referenced
	 * element maintains a list of "clients" that identifies the elements that
	 * refer to it. The client list is used when the target element changes
	 * names or is deleted. In these cases, the change automatically updates the
	 * clients as well.
	 * <p>
	 * References can be in two states: resovled and unresolved. An unresolved
	 * reference is just a name, but the system has not yet identified the
	 * target element, or if a target even exists. A resolved reference caches a
	 * pointer to the target element itself.
	 * 
	 * @param oldRef
	 *            the old reference, if any
	 * @param newRef
	 *            the new reference, if any
	 * @param prop
	 *            definition of the property
	 */
	protected void updateReference( ElementRefValue oldRef,
			ElementRefValue newRef, ElementPropertyDefn prop )