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Is there a limit for queries on Wikidata (SPARQL queries only, not editing)? I couldn't find any official documentation about this. I wonder how strong queries are limited per minute/hour (and per IP-address).
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The /entity/ (wd:) represents Wikidata entity (Q-number values). The /prop/direct/ (wdt:) is a "truthy" property — a value we would expect most often when looking at the statement. The truthy properties are needed because some statements could be "truer" than others.
You can query the data in Wikidata through our SPARQL endpoint, the Wikidata Query Service. The service can be used both as an interactive web interface, or programmatically by submitting GET or POST requests to https://query.wikidata.org/sparql .
OPTIONAL is a binary operator that combines two graph patterns. The optional pattern is any group pattern and may involve any SPARQL pattern types. If the group matches, the solution is extended, if not, the original solution is given (q-opt3. rq).
Yes, there are limits.
Single query is currently limited to 1 minute runtime. Docs are here: https://www.mediawiki.org/wiki/Wikidata_query_service/User_Manual
Also, each IP is limited to 5 concurrent requests currently. There's no limit on how many sequential requests can be processed.
These limits may be adjusted depending on capacity and traffic.
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