XTM 2.0 import is supported out of the box. Other parsers and importers may be implemented by other modules.
Warning
We intend to replace the current parser infrastructure with Lars Heuers tm package and its system for plugging in parsers before 1.0.
You can subclass ztm.topicmaps.parsers.base.TopicMapsParser and register it with the ZCA. See the XTM parser for an example.