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Semantic heads
The success of the generation strategy that is used by BUG very much depends on the definition of semantic head of a rule. The semantic heads are used to make it possible to compute links between a feature structure and a seed. Furthermore, by using these links, it is assumed that the semantics of other daughters of a rule get instantiated, to make a directed generation process possible. Therefore, the following condition <11> on semantic heads applies.
The first part of this condition states that the semantics of
the semantic head of a rule must be predictable from the
semantics of the mother node of this rule.
The second part of <11> states that the semantics of the
daughters of a rule must be predictable from the semantics
of the mother and the syntax of the semantic head.
The first part of the condition is a condition on rules, whereas
the second part of the condition is a condition on grammars,
because it is not clear what the syntax of the head
can turn out to be, without looking at the complete grammar.
Gertjan van Noord
Fri Nov 25 13:48:52 MET 1994