Accessibility is in the first instance a relation between DRSs; derivatively, it is also a relation between discourse referents. [6c1] is accessible to [6c2], but not the other way round, and therefore the discourse referents introduced in [6c1], i.e., x and z, are accessible from [6c2], but conversely, if we are in [6c1] we have no access to [6c2] and its discourse referents, i.e., y. Thus in [6c] anaphora is not possible because y is not accessible to z. In [4a], by contrast, anaphora is poss