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Predicate xref_source_directory/2
 prolog:xref_source_directory(+Source, -Dir)[multifile, library(pce_prolog_xref)]
Find the directory of a PceEmacs buffer to resolve relative paths.
 prolog:xref_source_directory(+Source, -Dir)[multifile, library(pce_prolog_xref)]
Find the directory of a PceEmacs buffer to resolve relative paths.