If a schema is available it should be possible to use it to check query correctness. Queries should incorporate variables from a local context. Ability to name, store and retrieve queries. Support for annotating XML documents. 2.6 Other Requirements Support for constraints on elements.
Several papers worry about the problem of semantic mismatch between the query and the data.
We Did Not Consider Papers were omitted from the above summary for a variety of reasons. This is prefectly legitimate in a position paper but our summary only attempted to extract requirements rather than list proposed solutions. While these area are undoubtedly important, they did not provide new and different requirements for XML query. Perhaps we missed some subtle distinctions.