hyperlink in NOTES is exported (as gpml) in the Comment, cannot open file in pathvisio

Celld NOTES are not exported as gpml except tag <a>, what crushes open file in pathvisio.
<Comment><a href="http://vmh.uni.lu/#metabolite/h2o">h2o</a></Comment>
Deleting <a>...</a> "fixes" the gpml file.

original cellD file h20-notes.xml
exported as gpml: output-01.gpml