RDF.XSD.non_positive_integer

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

non_positive_integer(value)

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See RDF.XSD.NonPositiveInteger.new/1.

Link to this function

non_positive_integer(value, opts)

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See RDF.XSD.NonPositiveInteger.new/2.