[NTG-context] Testing whether an XML attribute exists

[NTG-context] Testing whether an XML attribute exists

[Michael Guravage]

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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
  \xmlflush{#1}
\stopxmlsetups

I have attached three files below: an XML address list, the ConTeXt source
file and the typeset result.

-- 
With kind regards,

Michael Guravage

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<?xml version="1.0" encoding="utf-8"?>

<addressBook>

  <family surname="Horwitz" prefix="">
    <address street="Bowery" housenumber="42-1" postcode="10003" city="New York"  telephone="(934) 012-3456" />
    <members>
      <member name="Jerome (Curly)" birthday="22.11.1903" email="curly@stooges.com" mobile="(934) 123-4567" />
      <member name="Moses (Moe)" birthday="10.06.1897" email="moe@stooges.com" mobile="(934) 234-5678" />
      <member name="Samuel (Shemp)" birthday="11.03.1895" email="shemp@stooges.com" mobile="(934) 345-6789" />
    </members>
  </family>


  <family surname="Feinberg" prefix="den">
    <address street="Bowery" housenumber="42-2" postcode="10003" city="New York"  telephone="(934) 012-3456" />
    <members>
      <member name="Louis (Lary)" birthday="05.10.1902" email="larry@stooges.com" mobile="(934) 456-7890" />
      <member name="Mabel" maiden_name="Haney" birthday="05.21.1904" email="mabel@stooges.com" />
    </members>
  </family>

</addressBook>

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\startxmlsetups xml:list:base
  \xmlsetsetup{#1}{addressBook|family|address|members|member}{xml:list:*}
\stopxmlsetups

\xmlregisterdocumentsetup{list}{xml:list:base}

\startxmlsetups xml:list:addressBook
  \title{Address List}
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:list:family
  %% {\bf \xmlatt{#1}{surname} \xmldoifnotatt{#1, prefix, ''} {, \xmlatt{#1}{prefix}}} \crlf
  {\bf \xmlatt{#1}{surname}}\crlf
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:list:address
  \xmlatt{#1}{street} \xmlatt{#1}{housenumber}\crlf
  \xmlatt{#1}{postcode}\crlf
  \xmlatt{#1}{city}\crlf
  \xmlatt{#1}{telephone}\crlf
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:list:members
  \starttabulate[|l|l|l|l|]
    \xmlflush{#1}
  \stoptabulate
\stopxmlsetups


\startxmlsetups xml:list:member
 \NC \xmlatt{#1}{name} {\tfxx \xmlatt{#1}{maiden_name}} \NC \xmlatt{#1}{birthday} \NC \xmlatt{#1}{email} \NC \xmlatt{#1}{mobile} \NC\NR
\stopxmlsetups

\starttext
  \xmlprocessfile{list}{stooges.xml}{}
\stoptext

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[NTG-context] Re: Testing whether an XML attribute exists

[Taco Hoekwater]

> On 17 Oct 2023, at 12:43, Michael Guravage <guravage@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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___________________________________________________________________________________

[NTG-context] Re: Testing whether an XML attribute exists

[Hans van der Meer via ntg-context]

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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 <taco@bittext.nl> wrote:
> 
> 
> 
>> On 17 Oct 2023, at 12:43, Michael Guravage <guravage@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
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> archive  : https://github.com/contextgarden/context
> wiki     : https://wiki.contextgarden.net
> ___________________________________________________________________________________


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___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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___________________________________________________________________________________