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The general
reference architecture for NLG systems has recently been presented in the
literature as an ideal organization of modules (and their interaction) that
are needed for the generation of an output text that realizes the content
given in the content structure.
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Given a content
structure, text planning creates a text plan that structures the
content as a text – i.e. a sequential presentation. This text plan
serves as input to the module for sentence planning. Sentence planning
divides the content into “digestable portions” that can be realised as
sentences. The output of the sentence planning module is a sequence of
sentence plans, whereby each sentence plan specifies how a portion of content
should be realised, with reference to the text plan and the flow of discourse
specified therein. These sentence plans then serve as input to the
lexico-grammatical generators, that generate the actual surface forms
(“sentences”).
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Text planning
together with sentence planning is usually called “strategic generation”,
whereas lexico-grammatical generation falls under “tactical generation”.
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On the next
slide we illustrate how the AGILE system captures this ideal.
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