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I’m creating an ontology using Protege and would like to specifiy restrictions on data properties. Let’s say there is a data property named hasCode. I’ve defined string as range and would like to further define that the maximum length is 3 characters.
Protege in OWL2 allows you to use the Manchester syntax to define data range expressions.
Open the range window, and enter a data range expression.
In this case to limit the length, you can have string[length x].
For more, see http://www.w3.org/TR/owl2-manchester-syntax/