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 null;
		return getDisplayProperty( module, prop );
	}
	/**
	 * Returns the value of the property in a localize format. Formats dates and
	 * numbers in the form according to the current locale. Converts choices and
	 * colors to their localized display names. Returns the localized display
	 * name for an element reference, etc.
	 * 
	 * @param module
	 *            the module
	 * @param prop
	 *            the property definition
	 * @return the localized display value of the property
	 */
	public String getDisplayProperty( Module module, PropertyDefn prop )
	{
		Object value = getProperty( module, prop );
		if ( value == null )
			return null;
		return prop.getDisplayValue( module, value );
	}
	/**
	 * Sets an unresolved extends name. The resolved relationships is not
	 * cached; it must be resolved later.
	 * 
	 * @param name
	 *            the name of the new parent element, or null if this element
	 *            does not extend any other element
	 */