Various embodiments of a computer-implemented method, computer program product, and data processing system are provided that identify a range filter in a mark-up language query. In response to receiving a query of at least one mark-up language document, the query comprising a plurality of singleton filters, at least one group of the plurality of singleton filters are identified. Each group of comprises at least two singleton filters, wherein each group is equivalent to a range filter having a start value and a stop value. The start value and stop value are based on at least two singleton filters of each group. A query plan is generated to process the query based on, at least in part, a range defined by the start value and the stop value of the at least two singleton filters of each group.