Hello everyone,

I was wondering about the example query "Average number of children per year". When I try to parse this using OpenRDF, I get the error "projection alias 'year' was previously used", in Jena "Variable used when already in-scope: ?year in ((str ?year) AS ?year)". This seems to be in line with the sparql specifications.

However, query.wikidata.org accepts it just fine. So I was wondering how exactly this kind of situation is being resolved.

Greetings,

Adrian