18. The method of claim 17 , consolidating the nodes further comprising: identifying a similarity degree of the different node paths of the matching nodes; and consolidating the matching nodes in the document index only if the similarity degree of the different node paths exceeds a similarity degree threshold.
17. The method of claim 14 , generating the document index further comprising: for at least two matching nodes matching a query node path through different node paths, consolidating the nodes in the document index.