21. The computer accessible medium of claim 20 , wherein the program instructions, when executed, further implement: generating a data object tree of the one or more data objects based on relationships between the corresponding tag names as defined in the one or more input documents; and wherein said identifying one or more purchasing parameters comprises traversing the data object tree comparing each data object of the tree to one or more data objects in a database specifying the one or more purchasing parameters.
21. The computer accessible medium of claim 20 , wherein the program instructions, when executed, further implement: generating a data object tree of the one or more data objects based on relationships between the corresponding tag names as defined in the one or more input documents; and wherein said identifying one or more purchasing parameters comprises traversing the data object tree comparing each data object of the tree to one or more data objects in a database specifying the one or more purchasing parameters. 22. The computer accessible medium of claim 21 , wherein in said identifying one or more purchasing parameters the program instructions further implement identifying the one or more purchasing parameters based upon a configuration file defining relationships between the purchasing parameters and the one or more tag names.