13. A computing system in accordance with claim 12 , wherein the act of determining that there is a default group identifier associated with any of a plurality of hierarchically-structured documents including the hierarchically-structured document comprises the following: an act of reading the default group identifier from a schema definition document that defines the structure of the element.
13. A computing system in accordance with claim 12 , wherein the act of determining that there is a default group identifier associated with any of a plurality of hierarchically-structured documents including the hierarchically-structured document comprises the following: an act of reading the default group identifier from a schema definition document that defines the structure of the element. 14. A computing system in accordance with claim 13 , wherein the act of reading the default group identifier from the schema definition document that defines the structure of the element comprises the following: an act of reading the default group identifier from an extensible markup language schema description (XSD) language document.