11. The system of claim 10 wherein the query includes search criteria relating to content of the structured document and the versioning information of a leaf vNode further includes content of the leaf vNode, and wherein the query handler is configured to identify the first vNode by comparing, for each leaf vNode, the content of a leaf vNode with the search criteria of the query to identify a matching vNode that includes versioning information matching the search criteria of the query.
11. The system of claim 10 wherein the query includes search criteria relating to content of the structured document and the versioning information of a leaf vNode further includes content of the leaf vNode, and wherein the query handler is configured to identify the first vNode by comparing, for each leaf vNode, the content of a leaf vNode with the search criteria of the query to identify a matching vNode that includes versioning information matching the search criteria of the query. 12. The system of claim 11 wherein a first argument of the vFunction includes a version identifier, and wherein the query handler is further configured to identify the first vNode by comparing the version identifier included in the versioning information of the matching vNode to the version identifier of the first argument of the vFunction, and determining that the matching vNode is the first vNode when the version identifier of the matching vNode matches the first argument of the vFunction included in the query.