/* 
 * accessSubtree -- table to store access subtree info 
 */
CREATE TABLE xml_accesssubtree (
	docid		VARCHAR(250),	-- the document id #
  rev 		INT8 default 1, --the revision number of the docume
  controllevel VARCHAR(50), -- the level it control -- document or subtree
  subtreeid VARCHAR(250), -- the subtree id 
	startnodeid	INT8,	-- the start node id of access subtree
  endnodeid INT8 -- the end node if of access subtree
);