In order to differentiate between the case of an absent or an empty
attribute on an xml-element I now use the following macro to set a TeX-
\if:
% #1=node #2=attribute #3 defaultvalue: execute \attributetrue/false
\def\setFlagToAttribute#1#2#3{%
\doifnot{\xmlattdef{#1}{#2}{NOTPRESENT}}{NOTPRESENT}%
{\doifelse{\xmlatt{#1}{#2}}{\empty}%
{\xmlvalue{choice}{#3}{\iftrue}}%
{\xmlvalue{choice}{\xmlatt{#1}{#2}}{\iftrue}}%
\csname#2true\endcsname\else\csname#2false\endcsname\fi
}%
}
I find the use of the NOTPRESENT not very elegant. Is there a path
expression and function that can tell the presence or absence of an
attribute, just as its value can be filtered with a/b...@option==value]?
Hans van der Meer
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