描述本体类，用来描述OWL,DAML.RDFS类的一个本体函数。-Simple example of describing the basic attributes of a OWL, DAML or RDFS class using the ontology API.　This is not meant as a definitive solution to the problem,but as an illustration of one approach to solving the problem. This example should be adapted as necessary to provide a given application with the means to render a class descr iption in a readable form.