Book info/title ignored when processing an assembly/structure

[Peter Desjardins <peter.desjardins.us@gmail.com>]

Hi!

I'm using the new assembly/resource/structure method to construct
books from topic elements. Thank you to everyone who worked on that
feature, it's extremely useful!

I am having trouble getting the titles of books to appear in my
rendered book files.

Based on my reading, I understand that I can include book metadata
such as a title in the structure element. For example:

 <structure renderas="book" xml:id="myId">
    <info>
      <title>My Book Title</title>
      <copyright>
        <year>2016-2017</year>
        <holder>My Company, Inc.</holder>
      </copyright>
    </info>
    <module renderas="chapter" resourceref="myTopicId"/>
  </structure>

When I process the assembly, the rendered XML file has the correct
book root element and it includes chapter elements rendered from my
topics. It does not have the book title though.

I see that the assemble.xsl stylesheet explicitly ignores the info and
title for a structure:

  https://github.com/docbook/xslt10-stylesheets/blob/master/xsl/assembly/assemble.xsl#L44

Does anyone know how I can supply the title for a structure?

Thanks for your help!

Peter