--- /dev/null
+[[template id=plugin name=hnb author="[[XTaran]]"]]
+[[tag type/format]]
+
+This plugin allows ikiwiki to process `.hnb` XML files, as created by
+the Hierachical Notebook [hnb](http://hnb.sourceforge.net/). To use it, you need to have
+hnb installed, since it uses the commandline interface of `hnb` program.
+
+It is roughly based on the `otl` plugin but uses `mktemp` to create temporary files since `hnb` has no "quiet" switch and otherwise the hnb version number and other as well as the output file name always would be in the output itself.