I will also not adopt the Strict Layer Hypothesis (Selkirk, 1984) which holds that elements of a given prosodic category (such as Intonational Phrase) must be exhaustively analysed into a sequence of elements of the next lower category (such as Phonological Phrase).
in the longer term, the intention is to integrate prosodic realisation within the framework of an HPSG-based concept-to-speech system.