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[求助]Jena 抓 owl:thing 的 subclass問題? 小弟請問各位大大: Jena 如何抓取owl:thing的subclass(owl:thing的第一層),因為我用 ontModel.listNamedClasses()去抓取,它會所有定義的subclass和super-subclass的抓出來,但小弟只想抓取 owl:thing的第一層,該如何去抓取呢?    收藏   分享   顶(0)

	第2楼

可以递归调用，找到所有类的父类，父类的父类，直到父类没有父类了，就是第一层了： Interface OntClass ExtendedIterator listSuperClasses(boolean direct)Answer an iterator over all of the classes that are super-classes of this class. Each element of the iterator will be an OntClass. See listSubClasses( boolean ) for a full explanation of the direct parameter. Parameters: direct - If true, only answer the directly adjacent classes in the super-class relation: i.e. eliminate any class for which there is a longer route to reach that child under the super-class relation. Returns: an iterator over the resources representing this class's sub-classes. Throws: OntProfileException - If the Profile.SUB_CLASS_OF() property is not supported in the current language profile.

	第3楼

使用 listHierarchyRootClasses 方法，不过注意加载本体的时候要用OWL_MEM_MICRO_RULE_INF这个参数，否则结果不正确