RDF.PrefixMap.merge-exclamation-mark

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

merge!(prefix_map1, prefix_map2, conflict_resolver \\ nil)

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Specs

merge!(t(), t() | map() | keyword(), conflict_resolver() | nil) :: t()

Merges two RDF.PrefixMaps and raises an exception in error cases.

See merge/2 and merge/3 for more information on merging prefix maps.