15. The method of claim 13 , further comprising: determining a number of node records of said node vector after said replacing; and determining a content index as said resulting state corresponding to a number of node records equal to one.
15. The method of claim 13 , further comprising: determining a number of node records of said node vector after said replacing; and determining a content index as said resulting state corresponding to a number of node records equal to one. 16. The method of claim 15 , further comprising performing a specified editing action relevant to said content according to a value of said content index.