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Aperture is a Java framework for extracting and querying full-text content and metadata from various information systems (e.g. file systems, web sites, mail boxes) and the file formats (e.g. documents, images) occurring in these systems.
J. Broekstra, A. Kampman, and F. van Harmelen. The Semantic Web -- ISWC 2002: First International Semantic Web Conference Sardinia, Italy, volume 2342 of Lecture Notes in Computer Science, Springer, Berlin, (2002)
J. Broekstra, A. Kampman, and F. van Harmelen. Proceedings of the first International Semantic Web
Conference (ISWC 2002), 2342, page 54--68. Sardinia, Italy, Springer Verlag, Heidelberg Germany, (June 2002)See also http://www.openrdf.org/.