STX is a transformation language in XML syntax that works event-based. Like in XSLT we can define templates that represent rules. These rules are evaluated while processing the input XML document in a linear way.
"This document defines two Session Description Protocol (SDP) attributes: 'group' and 'mid'. They allow to group together several 'm' lines for two different purposes: for lip synchronization and for receiving media from a single flow (several media strea