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Pack prologmud -- prolog/prologmud_web/src_webui/model/substance.pl
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 substance(-Term:term) is nondet
Term is a partially bound term, used to interrogate state of the MUD.
map_origin(X, Y) - absolute coordinates Y down location of UL corner cell

map_size(X, Y) - size to display, in cells across and down

cell(+Player, +X, +Y, -Semantics) -

  • called with Player, X, and Y bound, binds Semantics to a term understandable by style/1