But there is also
\ifxmlattempty{#1}{prefix} .. \else .. \fi
yours sincerely
dr. Hans van der Meer
> On 17 Oct 2023, at 13:37, Taco Hoekwater <t...@bittext.nl> wrote:
>
>
>
>> 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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