Compared with conventional query languages, more factors should be considered in developing multimedia query languages because multimedia information is composed of large unformatted media data and also has multiple complex structures such as hyperlink networks and spatial/temporal layout structures, as well as logical structures. In this paper, we propose an object-oriented multimedia query language for handling multi-structure information. The query language is specified in compliance with the SQL3 standard, and the type hierarchy and query expressions are enriched to support various query types (i.e. attribute, content, structure, hyperlink queries) and all the structures (i.e. logical, spatial/temporal layout, hyperlink network structures).
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