Knowledge Base

• The Knowledge Base consists of rules and working memory (WM)
• Rules are if then statements
• On the if side you have conditional expressions, (e.g. (Feature ?X colour green))
• You can have variables in here, in this case ?X is a variable.
• On the then side you usually have assignments.
• That is you set or modify working memory items.
• In Clips you set values by (assert (fact)); so on the then side we (assert (Feature ?X1 subtype watermelon))
• You compare by stating the fact in the if part or by using (test (func params)). E.g (test (> ?a 3))
• The if part is conjoined by and by default
  and you can use the and or, and not functions
• Variables cross expression e.g.:
• If (favorite-colour ?Val) then (assert (pick Colour ?Val)