Hi,
depending on your need for speed and how many tasks already implemented you’re willing to redo, the choice is between the C API and the Tamino OCX which is a high level API capable of returning DOM objects from queries and so on.
If you need DOM, I think you should try Tamino.OCX first and stick to it if its speed suffices.
X-Tension is a different kind of animal, think of stored procedures. X-Tensions are used to do intra-server processing, like storing/retrieving data submitted to / queried from Tamino in / from another application. Here, the interface between Tamino and that other application would be a Server Extension.
Best regards, Andreas
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