11. The method of claim 10 wherein the versioning information of a vNode comprises at least one of a start date corresponding to a check-in date of a version of the structured document in which the vNode is first detected in the structured document, and an end date corresponding to a check-in date of another version of the structured document in which the vNode no longer exists in the structured document.
11. The method of claim 10 wherein the versioning information of a vNode comprises at least one of a start date corresponding to a check-in date of a version of the structured document in which the vNode is first detected in the structured document, and an end date corresponding to a check-in date of another version of the structured document in which the vNode no longer exists in the structured document. 12. The method of claim 11 wherein the index information in the index key associated with the first vNode includes at least one of the start date and the end date.