Help needed with screeninfo and informaltable in docbook5

Good Morning!

I need your support again on two points where I am not getting further.

At the moment I converting the darktable documentation from docbook4 to docbook5

A first preliminary result can be seen here.

https://github.com/mepi0011/darktable/tree/docBook5_port/doc/usermanual

1.) In some xml-files I have a screenshot element with an screeninfo element.

For the docbook5 adaptation I changed this as follows, but I'm not sure if this is correct.

docbook4:

<para>

<screenshot>

<screeninfo>The map view</screeninfo>

<graphic fileref="images/map_view.png" scalefit="1" width="80%"></graphic>

</screenshot>

</para>

docbook5 apaption:

<para>

<screenshot>

<info>

<title>

The map view

</title>

</info>

<mediaobject>

<imageobject>

<imagedata fileref="images/map_view.png" scalefit="1" width="80%" />

</imageobject>

</mediaobject>

</screenshot>

</para>

2.) My second Problem is that emacs mark "width" in an informaltable as non valid.

<informaltable frame="none" width="80%">

How do I change this to make it docbook5 compliant?

Thank you for your answers!

Pierre