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|Adding IRI schemas|
The file handling predicates may be hooked to deal with
IRIs. An IRI starts with <scheme>
where <scheme> is a non-empty sequence of lowercase
ASCII letters. After detecting the scheme the file manipulation
predicates call a hook that is registered using register_iri_scheme/3.
Hooking the file operations using extensible IRI schemas allows us to place any resource that is accessed through Prolog I/O predicates on arbitrary devices such as web servers or the ZIP archive used to store program resources (see section 13.2). This is typically combined with file_search_path/2 declarations to switch between accessing a set of resources from local files, from the program resource database, from a web-server, etc.
file) and exists_directory/1 (Mode is
directory). The result argument must be unified with a boolean.