Converting Docbook epub to Kindle shows warnings

Hello,

I'm using Apache Ant to create an epub with the XSL stylesheets. This
works fine.

During the conversion to .mobi via the Amazon command line tool
kindlegen I get several warnings which may indicate that the generated
epub has some issues. See below for the error messages. I attached the
file in question. I noted that in the Kindle version several TOC
entries are in the same line: I think this might be the reason for
this.

Has anyone seen such issues and know how to solve them?

Best regards, Lars

Warning(inputpreprocessor):W29004: Forcefully closed opened Tag: <dl>
      in file: /tmp/mobi-v0Xfht/OEBPS/bk01-toc.html     line: 0000004
Warning(inputpreprocessor):W29004: Forcefully closed opened Tag: <dd>
      in file: /tmp/mobi-v0Xfht/OEBPS/bk01-toc.html     line: 0000004
Warning(inputpreprocessor):W29010: Tag rejected due to being used in
unauthorized scope: <dt>
      in file: /tmp/mobi-v0Xfht/OEBPS/bk01-toc.html     line: 0000004
Warning(inputpreprocessor):W29010: Tag rejected due to being used in
unauthorized scope: <dd>
      in file: /tmp/mobi-v0Xfht/OEBPS/bk01-toc.html     line: 0000004
Warning(inputpreprocessor):W29010: Tag rejected due to being used in
unauthorized scope: <dt>
      in file: /tmp/mobi-v0Xfht/OEBPS/bk01-toc.html     line: 0000005
Warning(inputpreprocessor):W29010: Tag rejected due to being used in
unauthorized scope: <dd>
      in file: /tmp/mobi-v0Xfht/OEBPS/bk01-toc.html     line: 0000005
Warning(inputpreprocessor):W29004: Forcefully closed opened Tag: <dl>
      in file: /tmp/mobi-v0Xfht/OEBPS/bk01-toc.html     line: 0000005
Warning(inputpreprocessor):W29004: Forcefully closed opened Tag: <dd>
      in file: /tmp/mobi-v0Xfht/OEBPS/bk01-toc.html     line: 0000005