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The idea of this module is to introduce additional ordering fields to speed up hierarchical data retrieval. See http://iamcam.wordpress.com/2006/03/24/storing-hierarchical-data-in-a-database-part-2a-modified-preorder-tree-traversal http://articles.sitepoint.com/article/hierarchical-data-database TODO: * Adding nodes: add 2 to each LHS and RHS where LHS or RHS is greater than the RHS where you are adding the node. * Re-Ordering nodes: add X to LHS and RHS for all greater nodes, where X is the total number of nodes being shifted (+2?). Might need to run a 'cleanup' also that removes gaps? * Live vs Stage + roll back etc? not sure what to do here. * Handle the query cases where a node should not be visible, and the children should not be visible. -This could be done by running a second query that excludes the range of values between the parent's LHS and RHS. Or perhaps by a sub-query.