https://tools.ietf.org/html/draft-ietf-mmusic-rid-15#section-10 Formal Grammar rid-syntax = %s"a=rid:" rid-id SP rid-dir [ rid-pt-param-list / rid-param-list ] rid-id = 1*(alpha-numeric / "-" / "_") rid-dir = %s"send" / %s"recv" rid-pt-param-list = SP rid-fmt-list *( ";" rid-param ) rid-param-list = SP rid-param *( ";" rid-param ) rid-fmt-list = %s"pt=" fm
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