protege下插件。简单插件，打开owl文件，获取类，获取实例，并显示。-protege under the plug. Simple plug-in, open the owl file, get the class to obtain an instance, and display.

本体论owl文件范例，文件的打开，保存，类的获取，等等。owl文件操作例子-Sample ontology owl file, the file open, save, access class, and so on. the owl file operation example