3 ) loom , cycl and owl are ontology specification languages which are perfecter than others , though they have some shortcomings : loom is not easy to learn and use , cycl is not used widely since it ' s not based on xml , and owl ' s all functions needs to be excavated since it is a recently recommended standard ( 3 ) loom 、 cycl和owl都是较为理想的本体表示语言，但它们又各有不足: loom是高级编程语言，不易于学习掌握. cycl不是基于xml的，在通用性上受到限制. owl是w3c最新推出的本体表示语言，现有许多本体编择工具还不能体现owl的特有功能
