Query languages and keywords based search engines are\ud conventionally specified and implemented with the\ud emphasis put on syntactic rules to which query typing and\ud answering must be bound. MDDQL is a query language\ud and system that operates on a semantic model in terms of a\ud graph based ontology. As a software technology, MDDQL\ud allows the meaning of/and associations between\ud information to be known and processed at execution time at\ud following levels: (a) driving the user to the construction of,\ud as meaningful as possible, queries with an advanced\ud concept-based search method, (b) resolving high level\ud queries into various data source specific query statements.\ud In addition, queries can be posed in more than one natural\ud sub-language. The major goal behind this approach has\ud been the simplification and scalability of both tasks: query\ud construction, even within multi-lingual user communities,\ud and addressing of a large number of possibly semantically\ud heterogeneous data sources in a distributed environment.\u
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