In our previous work, we proposed the ontology-based integration of data warehousing to make existing data warehouse system more user-friendly, adaptive and automatic. This paper further outlines a high-level picture of the ontological engineering in data warehousing. Its basic theory includes building ontology profiles for warehousing in terms of domain ontology and problemsolving ontology, analyzing ontological commitment and semantic relationships of ontological items, aggregating,

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... ng, mapping, querying and discovering semantic relationships and/or ontological items crossing multiple relevant ontological domains. We introduce and illustrate them very briefly in terms of a web-based electronic institution F-Trade.