Lightweight, spec-compliant OCL, QVT-O, QVT-R and MOFM2T engines — standalone Java libraries, no Eclipse platform required.
Fennec M2X (org.eclipse.fennec.m2x) provides clean-room, specification-compliant implementations of the OMG modeling-transformation stack — OCL, QVT Operational, QVT Relations and MOFM2T — that run as plain Java 21 libraries and as OSGi services. Every engine works without the Eclipse platform.
QVT-O, QVT-R and MOFM2T units can be compiled into a storable document — the AST together with its manifest, its dependencies and the fingerprints it was built against — and later loaded, prepared and executed without a parser. How that works, and what the dependency modes embed, pin and rebind mean, is described once for all languages in the Compiled Units guide.
The OCL engine ships as an Eclipse feature that adds OCL delegate support to the generic EMF editor. Install it from the Eclipse update site, or follow the installation guide.