DB2 V9.5 lifts this restriction, and now users can annotate and decompose the data even when the schema is recursive.
DB 2 V9.5解除了这个限制，现在即使模式是递归的，用户也可以对数据进行注释和分解。
2
One is to get a full XML description of the whole category schema, and the other is a recursive style using the methods defined in the Asset Manager Web service API.
The problem to find out all candidate keys of relation schema is solved satisfactorily. And a new recursive algorithm of finding out all candidate keys is given.