RDF.XSD.nonNegativeInteger

You're seeing just the function nonNegativeInteger, go back to RDF.XSD module for more information.
Link to this function

nonNegativeInteger(value)

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See RDF.XSD.NonNegativeInteger.new/1.

Link to this function

nonNegativeInteger(value, opts)

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See RDF.XSD.NonNegativeInteger.new/2.