One rewrite a query on the global ontology to queries on the local ontology, the other rewrite a query on the local ontology to queries over the data sources.
算法一将用户提出的对全局本体的查询转化为对局部本体的查询，算法二将对局部本体的查询转化为对数据源的查询。
One rewrite a query on the global ontology to queries on the local ontology, the other rewrite a query on the local ontology to queries over the data sources.
算法一将用户提出的对全局本体的查询转化为对局部本体的查询，算法二将对局部本体的查询转化为对数据源的查询。
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