On 8/16/20 11:46 AM, Taco Hoekwater wrote:
> \xmlfilter is your friend:
>
>  \startxmlsetups xml:initialize
>    \xmlsetsetup{#1}{html}{xml:gen}
>  \stopxmlsetups
>
>  \xmlregistersetup{xml:initialize}
>
> \startxmlsetups xml:gen
>     \xmlfilter{#1}{/**/span[@class='special']/command(xml:special)}
> \stopxmlsetups
>
>  \startxmlsetups xml:special
>    \bgroup\bfd\ssd\xmlflush{#1}\egroup
>  \stopxmlsetups

Many thanks for your reply, Taco.

This was extremely handy and helpful (it is also the first time I
understand what \xmlfilter is used for).

My final solution required nesting filters, which worked perfectly fine
(included below).

Many thanks for your help,

Pablo


Just for the record:

  \startbuffer[demo]
  <html>
    <body>
      <div id="First">
        <p>This is
          <span class="special">One</span> a paragraph.</p>
        <p>This is another paragraph.</p>
        <p>This is another
          <span class="special">Two</span> paragraph.</p>
        <p>This is another
          <span class="special">Three</span> paragraph.</p>
        <p>This is another
          <span class="special">Four</span> paragraph.</p>
      </div>
      <div id="Second">
        <p>This is
          <span class="special">A</span> a paragraph.</p>
        <p>This is another paragraph.</p>
        <p>This is another
          <span class="special">B</span> paragraph.</p>
        <p>This is another
          <span class="special">C</span> paragraph.</p>
        <p>This is another
          <span class="special">D</span> paragraph.</p>
      </div>
    </body>
  </html>
  \stopbuffer

  \startxmlsetups xml:initialize
    \xmlsetsetup{#1}{html}{xml:gen}
  \stopxmlsetups

  \xmlregistersetup{xml:initialize}

  \startxmlsetups xml:gen
     \xmlfilter{#1}{/**/div/command(xml:chapter)}
  \stopxmlsetups

  \startxmlsetups xml:chapter
    \startsection[title=\xmlatt{#1}{id}]
      \startitemize[packed]
        \xmlfilter{#1}{**/span[@class='special']/command(xml:special)}
      \stopitemize
    \stopsection
  \stopxmlsetups

  \startxmlsetups xml:special
    \startitem\xmlflush{#1}\stopitem
  \stopxmlsetups

  \starttext
    \xmlprocessbuffer{main}{demo}{}
  \stoptext
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