Hi all,

no real example, just snippets, sorry: I need to process xml documents in lua (because I want to collect information in tables). The structure is a bit irregular:

<document>
  <chapter title="One">
    <section title="One">
      <subsection title="One">
        Text
      </subsection>
    </section>
  </chapter>
  <chapter title="Two">
    <subsection title="One">
      Text
    </subsection>
  </chapter>
</document>

So chapters may or may not have sections. If, on the level of my subscetions, I want to extract the information of the chapter title, in a ConTeXt environment, I could say \xmlattribute{#1}{ancestor::chapter}{title}. How could I do the same in lua? I have something like
xml.attribute(e, "../../chapter", "title", "")
but that only works for the first case, not the second one. I tried to understand the lpegs in lxml-lpt.lua, but didn't succeed.

Thanks, and best wishes

Thomas
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