Hi,
every Virtuoso SPARQL endpoint now includes a checkbox called "Strict
checking of void variables". Unfortunately, I haven't been able to find
documentation describing what exactly this checkbox (or debug=on GET
parameter) does. Can you please point me to its authoritative description?
My motivation: As others in the past (e.g.,
http://boards.openlinksw.com/support/viewtopic.php?f=12&t=1381) I have on
numerous occasions encountered the "Virtuoso 37000 Error SP031: SPARQL
compiler: Variable '_::trans_subj_XYZ is used in subexpressions of the
query but not assigned" error when using SPARQL 1.1 property paths. With
"Strict checking of void variables" turned off, this error goes away. I'd
like to know what exactly is changed.
Best,
Jindřich
--
Jindřich Mynarz
http://mynarz.net/#jindrich
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