7 External entities
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Availability::- use_module(library(sgml)).(can be autoloaded)
Sourcesgml_register_catalog_file(+File, +Location)
Register the indicated File as a catalog file. Location is either start or end and defines whether the catalog is considered first or last. This predicate has no effect if File is already part of the catalog.

If no files are registered using this predicate, the first query on the catalog examines SGML_CATALOG_FILES and fills the catalog with all files in this path.