The XSLT mapper helps you compose XSLT that aggregates data from one or more source documents, regardless of their origin or XML. For example, an inventory application might use information from multiple vendors, each of whom organizes invoices in a different way. You can use the XSLT mapper to identify source documents, map the relevant nodes from each to a target document, and in doing that define any required XSLT instructions, XPath or Java functions, and logical operators graphically.