The difference between Saxon-B and Saxon-SA was that B was "basic" while SA was "schema-aware". These terms are references to terms in the XSLT 2.0 and XQuery 1.0 specification. A processor that is "schema-aware" is able to use a W3C XML Schema to define the data types of the various elements in the source XML document(s). These data types can then be used in XPath 2.0 and XSLT 2.0 commands. A "basic" XSLT 2.0 processor is unable to use data typing information.