We describe an implementation in Carpenter's typed feature formalism, ALE, of a discourse gramm a r of the kind proposed by Scha, Polanyi, et al. We examine their method for resolving parallelism-dependent anaphora and show that there is a coherent feature-structural rendition of this type of grammar which uses the operations of prwrity union and generalization. We describe an augmentation of the ALE system to encompass these operations and we show that an appropriate choice of definition for priority union gives the desired multiple output for examples of vP-ellipsis which exhibit a strict/sloppy ambiguity. .
