When the value for the format attribute is unknown or unsupported by a processor, it must render the contained text as if no value were specified for the format attribute. This test is labelled as platform dependent since currently the SSML specification does not currently specify any allowed values for the interpret-as or format attributes.In this test, both reference and test utterances should sound identical. Manual='PLAT_DEP' The six wives of King Henry VIII . The six wives of King Henry VIII .