Input to a transformation engine is produced, responsive to a client computer providing a data access service (DAS) computer with XML data for transformation, by creating a graph shell and XML store for the XML data, determining if the graph has a store; and, if so, requesting an empty TrAX result; requesting to fill the empty TrAX result using TrAX source, and requesting a store parser for events related to the XML store; while avoiding wrapping by the TrAX DAS of a graph shell with TrAX source, requesting by a TrAX source of a graph for one or more nodes, requesting by a graph from a store for one or more nodes, parsing of a buffer by a store, returning events from a store to a graph, building of a graph by the same graph, returning nodes from a graph to a TrAX source; and building events by a TrAX source.