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Inge Henriksen announced the release of his open source C++ Topic Maps engine. It has bindings for lots of scripting languages:
My first main goal with this new engine was to enable C++ programmers (the same programming language in which TM++ is written) to be able to use topic maps in their programs. The second goal was to make a really fast topic maps engine without having to fall back on caching and the likes. The engine is based around TMDM 1.0, and you can also work with XTM 1.0 and XTM 2.0 files.