7. The method of claim 6 , wherein all siblings of a new category that are sub-categories of the new category are moved to be direct children of the new category in the category graph.
7. The method of claim 6 , wherein all siblings of a new category that are sub-categories of the new category are moved to be direct children of the new category in the category graph. 8. The method of claim 7 , wherein each category is assigned a namespace, and the namespace of a category contains entries of direct sub-categories.