However, RL can undergo not only expansion but also replacement: For color, speaker B proposes both purple and pinkish, but only pinkish is then accepted by A.
to a literary model of reference, a collaborative model represents reference resolution as a process of iteratively presenting RL to the other participant(s) in a dialog, which is then either accepted as being sufficient to identify a referent or rejected as insufficient (Clark and Wilkes-Gibbs, 1986, 9).