Is it possible to define a multi-highlighter?

The builtin highlighters work quite well and I wonder how to best support highlighting files that contain multiple languages in the autotest context. This has the "autotest syntax" and another language defined within. Short example:

### GnuCOBOL Test Suite

AT_SETUP([cobc with standard configuration file]) AT_KEYWORDS([configuration misc])

AT_DATA([prog.cob], [ IDENTIFICATION DIVISION. PROGRAM-ID. prog. AUTHOR. tester. DATA DIVISION. WORKING-STORAGE SECTION. PROCEDURE DIVISION. STOP RUN. ])

# default configuration permits this extension AT_CHECK([$COMPILE_ONLY prog.cob], [0], [], [prog.cob: 4: warning: AUTHOR is obsolete in GnuCOBOL ])

AT_CLEANUP

Is it possible to define something like this (one language "outside", another one "inside") or is the only option to define an autotest syntax highlighter (feature-request, wink, wink) and switch between this one and the highlighter for the "included" language?

Not bow. When I will change editor engine, it will be possible. All highlighters will be external