Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
assert library != null;
		assert theme != null;
		
		
		String name = theme.getName( );
		assert !StringUtil.isBlank( name )
				&& ModelMessages.getMessage( IThemeModel.DEFAULT_THEME_NAME )
						.equals( name );
		NameSpace ns = library.getNameSpace( Module.THEME_NAME_SPACE );
		assert library.getModuleNameSpace( Module.THEME_NAME_SPACE )
				.canContain( name );
		ns.insert( theme );
		
		library.add( theme, ILibraryModel.THEMES_SLOT );
	}
	/**
	 * Uses the new name space of the current module for reference property
	 * values of the given element. This method checks the <code>content</code>
	 * and nested elements in it.
	 * 
	 * @param module
	 *            the module that <code>content</code> attaches.
	 * @param content
	 *            the element to revise
	 * @param nameSpace
	 *            the new name space
	 */
	public static void reviseNameSpace( Module module, DesignElement content,
			String nameSpace )
	{