一个可视知识查询语言CAOBS／VKQL

SCAOBS/VKQL:One Visual Knowledge Query Language

介绍的ＣＡＯＢＳ／ＶＫＱＬ是一个可视知识查询语言，它以灵活、直观、方便的图形操纵方式提供给用户访问、查询知识库的强大能力。该语言的查询模型以ＲＩＫＯＭ知识模型为基础。用户通过构造查询图（ＱｕｅｒｙＧｒａｐｈ）来表达查询要求。ＣＡＯＢＳ／ＶＫＱＬ具备完整的ＯＯ查询语言的能力，不仅可以访问数据级知识，还可以访问模式级知识，而且吸收了现有的其它可视查询语言的一些优点，同时采用了更为直观、灵活的图形表示方法，更有利于用户理解和掌握。

AOBS / VKQL is the visual knowledge query language we have designedunder our RIKOM knowledge model. With it, users express their query requirements byconstructing Query Graph. On function, CAOBS / VKQL has the complete capability ofan object-oriented query language, not only refering the data-level knowledge, but also theschema- level knowledge. On form it absorbs some advahtages of other visual query languages and adopts some more straight and flexible graphical expressive methods. In thisway CAOBS / VKQL reaches two important goals of the good query language, i.e, strongexpressive capability and high convenience.