yours sincerely

dr. Hans van der = Meer

On 17 Jun 2024, at 16:52, = Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> = wrote:

Hans van = der Meer schrieb am 17.06.2024 um 09:01:
I = want to show an errormessage when the macro is undefined. It requires = expansion of \xmlatt{#1}{name}.
\ifdefined\xmlatt{#1}{name} didn't = worked nor \expandafter\ifdefined
I thought of the expanding = \doif's.
See the attached output of this xmlsetup = attached.
\startxmlsetups = hvdm:system:macrocall
%
\doifelsedefined{\xmlatt{#1}{name}}
{
= %
%macro without = argument
%
\ifxmlattempty{#1}{arg}
\begincsname\xmlatt{#1}{name}\= endcsname
%
%macro with = argument
%
\else
\begincsname\xmlatt{#1}{name}\endcsname{\xmlatt{= #1}{arg}}
\fi
}
{
\ERROR{macro \xmlatt{#1}{name} is not = defined}
}
\stopxmlsetups

I have no idea = what's wrong in your code without a proper minimal example. As the = example below shows you can use \doifelsedefined in combination with = \xmlatt.

\startbuffer[ifdefined]
<document>
= <macro name=3D"bold" arg=3D"text"/>
<macro = name=3D"hvdm" = arg=3D"text"/>
</document>
\stopbuffer

\startxmlsetu= ps xml:document
= \xmlflush{#1}
\stopxmlsetups

\startxmlsetups = xml:macro

\doifelsedefined{\xmlatt{#1}{name}}
=    {\texdefinition{\xmlatt{#1}{name}}{\xmlatt{#1}{arg}}}    {{\tttf macro \tex{\xmlatt{#1}{name}} not = defined}}

% \ifcsname\xmlatt{#1}{name}\endcsname
% =   \lastnamedcs{\xmlatt{#1}{arg}}
% \else
% =   %
% \fi

\stopxmlsetups

\startxmlsetups = xml:hvdm
\xmlsetsetup{\xmldocument}{document|macro}{xml:*}
\stopxmls= etups

\xmlregistersetup{xml:hvdm}

\starttext
\xmlprocessb= uffer{hvdm}{ifdefined}{}
\stoptext

Wolfgang
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