Hey,

> and it's DataType should be  "Commons media file"  ? not "string" ?

The DataType is not specified in the JSON segment you pasted. It is not stored in entity pages. The "string" indicates the type of DataValue, which is a more low level concept. We have a limited set of these DataValue types, and a potentially much bigger set of DataTypes build on top of that. For instance the DataTypes "integer", "positive integer", "percentage" and "probability" would presumably all use the "number" DataValue.

> another Question : should i usually rely on the datatypes written in the json dumps or should i build and index of wkidata properties and their datatypes to avoid such situation ?

If you need the actual DataType, you will indeed need to build an index with the properties.

Cheers

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Jeroen De Dauw
http://www.bn2vs.com
Don't panic. Don't be evil. ~=[,,_,,]:3
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