Conversion Engines

Often it is simplest to use Unix scripts or Perl (Python), esp. on normalised instances of SGML documents.

A freely available SGML processing engine is Omnimark Light (Omle). A snippet from an Omnimark program:

;
; Handle Images...
;
ELEMENT IMG 
        OUTPUT "<%q "
        DO WHEN ATTRIBUTE src IS SPECIFIED
                OUTPUT "  src=%"%v(src)%" "
        DONE
        DO WHEN ATTRIBUTE align IS SPECIFIED
                OUTPUT "  align=%"%v(align)%" "
        DONE
        DO WHEN ATTRIBUTE ismap IS SPECIFIED
                OUTPUT "  ISMAP"
        DONE
        OUTPUT ">%sc"