assemble.xsl: empty info element when omittitles is true

[janiveer]

When an assembly contains this module:

<module renderas="simplesect">
  <merge>
    <title>My new title</title>
  </merge>
  <!-- other modules -->
  <module resourceref="my_ref" contentonly="1" omittitles="1"/>
</module>

And the resource referenced by my_ref contains the following:

<topic>
  <info>
    <title>Unwanted title</title>
  </info>
  <!-- other content -->
</topic>

Then the output file contains an empty <info> element, as follows:

<simplesect>
  <info>
    <title>My new title</title>
  </info>
  <!-- content from other modules -->
  <info>
  </info>
  <!-- other content -->
</simplesect>

Where the second, empty info element is copied from the resource my_ref with all titles omitted.

[janiveer]

Just to clarify, in most cases this problem will probably only arise when aggregating content from several resources into a single module.

[janiveer]

My proposal would be that when omittitles is true, the stylesheet should omit the entire <info> element from the resource, as well as the <title>, <titleabbrev>, and <subtitle> elements. There may be several other ways of fixing this issue; this seems like the simplest way, although it would involve a change in behaviour.

[bobstayton]

Sorry for the delay in responding. I don't think an empty info element is a problem. It is still valid DocBook. Deleting the info element when it might have other content would also be a problem because that is not the documented behavior of the attribute, which says only titles will be omitted. https://tdg.docbook.org/tdg/5.1/module.html