> On 17 Oct 2023, at 12:43, Michael Guravage <gurav...@literatesolutions.com>
> wrote:
>
> Hi,
>
> I am typesetting a very simple address list whose source is written in XML.
> Typesetting choices need to be made dependent on the presence of various
> attributes; consider the following <family> element.
>
> <family surname="Boer" prefix="den">
>
> If the prefix attribute exists I'l like the name to appear as, e.g. 'Boer,
> den." The several XML attribute testing functions in the XML manual appear
> to discriminate on an attribute's value. I tried \xmldoifnotatt in an
> attempt to say, "TRUE if prefix does not match an empty string", since I am
> not interested in the attribute's value but only whether or not it exists.
> The code below doesn't work. If someone who knows why it doesn't work would
> enlighten my ignorance I would be most grateful. A brief explanation and
> example of \xmldoifatt, \xmldoifnotatt, and \xmldoifelseatt would be
> exceedingly helpful.
>
> \startxmlsetups xml:list:family
> {\bf \xmlatt{#1}{surname} \xmldoifnotatt{#1, prefix, ''} {,
> \xmlatt{#1}{prefix}}} \crlf
Syntax error there, you need:
\xmldoifnotatt{#1}{prefix}{}{, \xmlatt{#1}{prefix}}
Best wishes,
Taco
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