How to get svn:mergeinfo in pre-commit hook?

To block svn:mergeinfo on single files or directories except root on some branches, I'm trying to filter it in a pre-commit hook.
While other properties like svn:log are accessible in the python based pre-commit script with the following lines, the property svn:mergeinfo is not, although it is set by the client and written if the pre-commit script is disabled.

  log = fs.svn_fs_txn_prop(txn_handle, 'svn:log')
  mergeinfo = fs.svn_fs_txn_prop(txn_handle, 'svn:mergeinfo')
  proplist = fs.svn_fs_txn_proplist(txn_handle)

Is it possible to access svn:mergeinfo before committing?
svn 1.6.4 is used on client and server.

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Received on 2009-09-18 17:53:37 CEST