RDF.PrefixMap.drop

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

drop(prefix_map, prefixes)

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Specs

drop(t(), [coercible_prefix()]) :: t()

Drops the given prefixes from prefix_map.

If prefixes contains prefixes that are not in prefix_map, they're simply ignored.