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Modify anaphoric relation

TUcurrent is calculated by modifying the interpretation of the previous temporal reference. The times differ in the filler of a field F, where F is at least as specific as time of day, but are consistent in all fields less specific than F. The resolvent contains the information in TUprevious that is less specific than Ftogether with the information in TUcurrent that is of the same or greater specificity as F. (See rule A-modify in Section 5.3.)

For example (see also (3)-(5) of the corpus example in Figure 1):

Utterance Interpretation
Monday looks good. Assume: Monday 19 August
How about 2? (co-reference relation) 2pm, Monday 19 August
Hmm, how about 4? (modify relation) 4pm, Monday 19 August