1. A method for processing data, the method comprising: identifying a processing pipeline defining a series of markup language processing steps; inserting at least one debugging step into the processing pipeline, the at least one debugging step defining processing to collect debug data associated with application of the markup language processing steps to markup language data to be processed by the processing pipeline; and executing the series of markup language processing steps, including the at least one debugging step, upon input markup language data as a transaction, execution of the at least one debugging step capturing the debug data for at least one of the series of markup language processing steps in the processing pipeline, the debug data allowing analysis of operation of the markup language processing steps of the processing pipeline on the input markup language data.