This is the first test

On Wed, 16 Nov 2022 at 16:11, Thomas A. Schmitz v= ia ntg-context <ntg-context@ntg.nl= > wrote:

= Hi all,

I thought this was easy, but I overestimated my competence=E2=80=A6 I want = to filter xml elements via their attributes and retrieve and typeset parts = belonging together. Here is a small test file that explains what I=E2=80=99= m trying:

\startbuffer[test]
<document>
=C2=A0 =C2=A0<topics>
=C2=A0 =C2=A0 =C2=A0 <topic id=3D"test1">
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <title>This is the first test</title&g= t;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <date>22/11/16</date>
=C2=A0 =C2=A0 =C2=A0 </topic>
=C2=A0 =C2=A0 =C2=A0 <topic id=3D"test2">
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <title>This is the second test</title&= gt;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <date>22/11/17</date>
=C2=A0 =C2=A0 =C2=A0 </topic>
=C2=A0 =C2=A0</topics>
=C2=A0 =C2=A0<chapters>
=C2=A0 =C2=A0 =C2=A0 <chapter id=3D"test1">
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <content>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 This will be the content of the <emph= >first</emph> chapter.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 </content>
=C2=A0 =C2=A0 =C2=A0 </chapter>
=C2=A0 =C2=A0 =C2=A0 <chapter id=3D"test2">
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<content>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 This will be the content of the <emph= >second</emph> chapter.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</content>
=C2=A0 =C2=A0 =C2=A0 </chapter>
=C2=A0 =C2=A0</chapters>
</document>
\stopbuffer

\startxmlsetups xml:testsetups
=C2=A0 =C2=A0 =C2=A0 =C2=A0 \xmlsetsetup{#1}{*}{-}
=C2=A0 =C2=A0 =C2=A0 =C2=A0 \xmlsetsetup{#1}{document|chapters|chapter|cont= ent|emph}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:testsetups}

\startxmlsetups xml:document
=C2=A0 =C2=A0 =C2=A0 =C2=A0 \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:chapters
=C2=A0 =C2=A0 =C2=A0 =C2=A0 \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:chapter
=C2=A0 =C2=A0 =C2=A0 =C2=A0 \xmlfunction {#1} {chapter}
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0\xmlflush {#1}
\stopxmlsetups

\startxmlsetups xml:chapter:content
=C2=A0 =C2=A0 =C2=A0 =C2=A0 \xmltext {#1} {content}
\stopxmlsetups

\startxmlsetups xml:emph
=C2=A0 =C2=A0{\em \xmlflush {#1}}
\stopxmlsetups

\startluacode
function xml.functions.chapter (t)
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0local ch_id =3D t.at.id
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 local metadata =3D = xml.filter (root, '../../topics/topic[@id=3D=3D"%s"]', ch= _id)
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 print (inspect(meta= data))
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 lxml.command(t, &qu= ot;.", "xml:chapter:content")
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 context.par ()
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 context (ch_id)
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 context.par ()
end
\stopluacode

\starttext
=C2=A0 =C2=A0 =C2=A0 =C2=A0 \xmlprocessbuffer{main}{test}{}
\stoptext

The line with xml.filter does not work as I expected. How can I walk the tr= ee, find the =E2=80=9Ctopic=E2=80=9D element with the same =E2=80=9Cid=E2= =80=9D attribute as the chapter I=E2=80=99m currently in, and then typeset = the different children of the topic element?

Thanks a lot and all best

Thomas

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