The link to "Initialising and Managing.." has to be changed to
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|Where is the reconsult/1 predicate?|
Some old Prologs used to have consult/1 that simply added the clauses to the database and reconsult/1 to reload during development. It lead to a lot of confusion. SWI-Prolog always wipes clauses loaded from a file that was already loaded. If you wish to load clauses from different files you need the ISO standard :- multifile Name/Arity ... directive; see multifile/1.