Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
Module library = module.getLibraryByLocation( url.toString( ) );
		if ( library == null )
			return null;
		return (LibraryHandle) library.getHandle( library );
	}
	/**
	 * Shifts the library to new position. This method might affect the style
	 * reference, because the library order is changed.
	 * 
	 * @param library
	 *            the library to shift
	 * @param toPosn
	 *            the new position
	 * @throws SemanticException
	 *             if error is encountered when shifting
	 */
	public void shiftLibrary( LibraryHandle library, int toPosn )
			throws SemanticException
	{
		if ( library == null )
			return;
		ShiftLibraryCommand command = new ShiftLibraryCommand( module );
		command.shiftLibrary( (Library) library.getElement( ), toPosn );
	}
	/**
	 * Returns whether this module is read-only.
	 * 
	 * @return true, if this module is read-only. Otherwise, return false.
	 */
	public boolean isReadOnly( )