Abstract: The inconsistencies in metadata have remarkable influence on the stability and reliability of data warehouse system. During the metadata creation based on Common Warehouse Metamodcl(CWM)，the different experiences and views of describing data of organizations involved in metadata creation bring metadata inconsistencies inevitably. However, detecting and resolving these inconsistencies in CWM metadata automatically is difficult because CWM metamodel and metadata are rendered to users by graphs, which lack precise semantics. In this paper, we researched how to check and resolve CWM metadata inconsistencies in terms of a logic belonging to Description Logics. First,how to formalize CWM metamodel and metadata by means of the presented Description Logic DLid which supports identification constraints on concepts was researched. Then the approach for checking metadata inconsistencies by query and reasoning mechanism of DLid was researched. At last, the approach for resolving inconsistencies through defining inconsistency resolution rules in DLid knowledge base was proposed. The results of the experiments with reasoning engine RACER are cncouragmg.

Key words: Common warehouse mctamodcl(CWM)，Description logic, Metadata integration, Inconsistency checking, Inconsistency resolving