Select Retrieval [NPE] filed suit against retailers headquartered in Illinois and Texas for alleged infringement of two patents related to graphical representation of hierarchical database records.  6/2, Northern District of Texas, 3:2011cv01166 and Northern District of Illinois, 1:2011cv03752.  Select Retrieval is likely controlled by the same entity as CodePro.  Both entities filed suit yesterday against multiple retailers for patents that were assigned to them on February 10, 2011.  The patents in both suits passed through earlier assignees with a common listed correspondent.  Both NPEs are represented by the firm Dietz & Jarrard in the Texas actions.  RPX client, Walgreen, is a named defendant in the Illinois suit.