Binary package “swi-prolog-doc” in ubuntu eoan

Documentation for SWI-Prolog interpreter and XPCE

 SWI-Prolog is a Prolog implementation based on a subset of the WAM.
 It is accompanied by XPCE, a symbolic programming environment for
 user interfaces.
 .
 This package contains the documentation in PDF and HTML format for
 SWI-Prolog and XPCE/Prolog.