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We use PostgreSQL DBMS for storing XML metadata, described by the IVOACharacterisation Data Model. Initial XML type support in the PostgreSQL hasrecently been implemented. We make heavy use of this feature in order toprovide comprehensive search over Characterisation metadata tree. We built aprototype of the Characterisation metadata query service, implementing twoaccess methods: (1) HTTP-GET/POST based interface implements almost directtranslation of the query parameter name into XPath of the data model element inthe XML serialisation; (2) Web-Service based interface to receive XQuery whichis also directly translated into XPath. This service will be used in theASPID-SR archive, containing science-ready data obtained with the Russian 6-mtelescope.

Comprehensive Metadata Query Interface for Heterogeneous Data Archives Based on Open Source PostgreSQL ORDBMS