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
String slotSelector = slotDefn.getSelector( );
		if ( StringUtil.isBlank( slotSelector ) )
		{
			return null;
		}
		return slotSelector;
	}
	/**
	 * Returns the property value.
	 * 
	 * @param module
	 *            the module
	 * @param prop
	 *            the definition of property
	 * @return the property value, or null if no value is set.
	 */
	public Object getProperty( Module module, PropertyDefn prop )
	{
		return getProperty( module, (ElementPropertyDefn) prop );
	}
	/**
	 * Returns whether this element is a style. While this information could be
	 * computed from meta-data, it is computed here for performance.
	 * 
	 * @return true if this is a style element, false otherwise.
	 */
	public boolean isStyle( )
	{
		return false;
	}