LumenVox provides complete support for SRGS Grammars in the XML-based format called GrXML.
While the grammar writing tutorial in this help file mainly covers the ABNF format, both
formats are equivalent. There is no real advantage as to which format you use.
If you have existing GrXML grammars, you can simply load them as normal.
If you are new to writing GrXML grammars, the SRGS specification
includes examples and a complete guide to the syntax of GrXML and ABNF.