Help:How do I search FactGrid?
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- https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual
- https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/queries/examples
How do I create new properties?
There is a Directory of Properties in the link list in the menu. Check whether the statement you want to make is already available with a P-number.
If you miss a particular P-number you can create it, but it is recommendable to discuss the new property first on Talk:Directory of Properties.
If you create a new property make sure that you have considered the data type. Do you want to link Q-numbers to other Q-numbers? Do you want to link them to dates, to URLs, to external identifiers like a GND number? This needs to be decided when creating the P-number for the respective statement.