[...] a theory of computational lexical semantics needs to make reference to four levels of representations: "Argument structure" encodes the conventional mapping from a word to a function, and relate the syntactic realization of a word to the number and type of arguments that are identified at the level of syntax and made use of at the level of semantics. "Event structure" identifies the particular event type for a verb or a phrase. There are essentially three components to this structure: the primitive event type - state ("S"), process ("P") or transition ("T"); the focus of the event; and the rules for event composition."Qualia structure" defines the essential attributes of objects, events, and relations, associated with a lexical item. By positing separate components [...] in what is, in essence, an argument structure for nominals, nouns are elevated from the status of being passive arguments to active functions [...]. "Lexical inheritance structure" determines the ways in which a word is related to other words in the lexicon. In addition to providing information about the organization of a lexical knowledge base, this level of word meaning provides an explicit link to general word (commonsense) knowledge. [...] A set of generative devices connects the four levels, providing for the compositional interpretation of words in context.
- Pustejovsky & Boguraev (2004), a pag.342