1997wmmis J.Z. Li, M.T. Özsu, D. Szafron and , V. Oria, MOQL: A Multimedia Object Query Language, The Third International Workshop on Multimedia Information Systems, Como Italy, September 1997, pp. 19-28. abstract or pdf.
Abstract:

We describe a general multimedia query language, called MOQL, based on ODMG's Object Query Language (OQL). In contrast to previous multimedia query languages, MOQL is general in its treatement of multiple media and different applications. The language includes constructs to capture the temporal and spatial relationships in multimedia data as well as functions for query presentation. MOQL is implemented for a multimedia database built on top of ObjectStore.