Description:

SVN::Dumpfilter reads a Subversion <http://subversion.tigris.org/>
dumpfile.

The file is parsed and a call-back subfunction is called with a
hash-reference for every 'node'. This function can modify, add or
delete headers, properties and the content of the node. After
processing of the call-back function the node is re-assembled and
stored in an output file.

The parse and re-assemble processes are done by dedicated subfunctions
which can be also exported ('internal' tag) for special filters (e.g.
merging filter which has to write the output file by its own).