Re: html table with three columns - following-sibling

following-sibling::/Base/Art_group/Art[position() <

you can never have a / after ::, as the error message you quoted says
you need an element name or  a node test such as node() or * after ::
following-sibling is no different from the default child axis: you don't
want to start back at / you want to move relative to your current node
so

following-sibling::Art[position() <

David

-- 
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