A concept hierarchy is composed of relation schemes with the same concept, in which specialization and generalization can be specified to enrich the semantics of the relational view. Based on the concept hierarchies, a procedure is designed to decompose a global query to local subqueries and a ...
embodiments and advantages are merely illustrative and are not considered elements or limitations of the appended claims except where explicitly recited in a claim(s). Likewise, reference to “the invention” shall not be construed as a generalization of any inventive subject matter disclosed herein ...
embodiments and advantages are merely illustrative and are not considered elements or limitations of the appended claims except where explicitly recited in a claim(s). Likewise, reference to “the invention” shall not be construed as a generalization of any inventive subject matter disclosed herein ...