Hi, is this comma mistakenly left in? I don't think it is needed there because the last element of the parallel structure is 'influencing the lifespan of discourse referents,' or so I think. What do you think?
Still, it has remained puzzling in many ways just what discourse referents are and where they fit into semantic theory. It seems appropriate to say that we are describing some aspect of the meaning of a word or construction of English when we talk about its capacity for introducing, picking up, or influencing the lifespan of, discourse referents. But is that an entirely separate aspect of meaning, or is it dependent upon other aspects of meaning, such as the referential and truth-conditional aspect? ---
(page 225 of 'File Change Semantics and the Familiarity Theory of Definiteness' by Irene Heim)