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Yep. Not only this but in the sample "wd:Q9682" is a lie. wd is a namespace shortcut which is expended to an URI, and the prefix to URI mapping has to be define

Yep. Not only this but in the sample "wd:Q9682" is a lie. wd is a namespace shortcut which is expended to an URI, and the prefix to URI mapping has to be defined as part of the query, otherwise it won't work. Notice how the sample use two of those prefixes (wd and wdt): data is segregated in different namespace that one have to search for and remember each time they want to make a query. And I mean remembering the prefix value, ie a partial URI, not the little cute prefix like wd that semweb sample always use.

bawolff 5y ago
The sparql endpoint that is typically used with wikidata has some namespaces implicitly predefined, including wdt and wd. You do not need to declare the wd: prefix if you are using the endpoint at https://query.wikidata.org https://query.wikidata.org I think its safe to assume in context that the newbie sparql user is not setting up their own sparql endpoint but using the official wikidata endpoint.