“Semantic Interpretation” (interpret.lsp)

• The basic idea: extract the command name and object attributes from the parse tree to facilitate precondition verification and action execution

(defstruct command

action

object

destination)

(defstruct location

(abs-position NIL)

(rel-direction NIL)

(rel-object NIL))

(defstruct object

ref

color

shape

place)

Parse the SENTENCE subtree

Parse the LOCATION subtree

Parse the OBJECT subtree

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