1. In a computing system that has access to a hierarchically-structured document having a plurality of elements that may each be associated with one or more namespaces, a method for establishing a plurality of abbreviated namespace identifiers for a hierarchically-structured document, the method comprising the following: an act of associating each of a plurality of hierarchical namespaces with an associated abbreviated namespace identifier; an act of accessing a hierarchically-structured document; and an act of determining that at least one group identifier is associated with the hierarchically-structured document, the group identifier representing that when any of the abbreviated namespace identifiers are found associated with an element in the hierarchically-structured document, that the associated namespace is also associated with that element.