Having a series of nodes in setups in a helper module:\startxmlsetups xmlcommon:setups
\xmlsetsetup{#1}{error|comment|... etcetera}{xmlcommon:*}
\stopxmlsetups
\xmlregistersetup{xmlcommon:setups}
I would like to check if a certain node is in that series of nodes. For example doing \doifelse{\xmltag{#1}}... where the true branch is taken when \xmltag{#1} is one of those registered in the xmlcommon:setups.
Is that possible? Then what macro has to be called?