XML files not valid

[7890]

Validating the XML files against ladspa-swh.dtd shows several problems.
The following diffs might be of interest to make all files pass the validation:

Changes to the DTD:
https://github.com/7890/ladspa/commit/da95d05364901de4cd550e3c4373079b90403f3f.patch
https://github.com/7890/ladspa/commit/d6f45a22c815efbe1255bb05d4baf545aa1b37ef.patch

Changes to the XML files:
https://github.com/7890/ladspa/commit/8ffab71f0ff0566de11dda314f8fc26207b081f1.patch
https://github.com/7890/ladspa/commit/3bc7ea34346d0fde09c90cce54cb06dbaf899238.patch
https://github.com/7890/ladspa/commit/7e9cf39af6777118abea545f46d1f3e2b83eeccc.patch

ls -1 *.xml | while read line; do xmlstarlet val -e -d ladspa-swh.dtd "$line" 2>&1 | grep -v " valid"; done

Greetings