RDF.XSD.DateTime.canonical_lexical_with_zone

You're seeing just the function canonical_lexical_with_zone, go back to RDF.XSD.DateTime module for more information.
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canonical_lexical_with_zone(xsd_datetime)

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Specs

canonical_lexical_with_zone(RDF.Literal.t() | t()) :: String.t() | nil

Converts a datetime literal to a canonical string, preserving the zone information.