I have the same doubts as Ian about which kinds of transformations you
are looking for, so I'll give you a summary 
Here we have done several works regarding data instance transformation
based on archetypes:
- Maldonado, J. A., Moner, D., Tomás, D., Ángulo, C., Robles, M., &
Fernández, J. T. (2007). Framework for clinical data standardization
based on archetypes. Studies in health technology and informatics,
129(1), 454.
- Moner, D., Maldonado, J. A., Bosca, D., Fernández, J. T., Angulo,
C., Crespo, P., ... & Robles, M. (2006, August). Archetype-based
semantic integration and standardization of clinical data. In
Engineering in Medicine and Biology Society, 2006. EMBS'06. 28th
Annual International Conference of the IEEE (pp. 5141-5144). IEEE.
- Moner, D., Maldonado, J. A., Boscá, D., Angulo, C., Robles, M.,
Pérez, D., & Serrano, P. (2010, May). CEN EN13606 normalisation
framework implementation experiences. In Seamless Care, Safe Care: The
Challenges of Interoperability and Patient Safety in Health Care:
Proceedings of the EFMI Special Topic Conference, June 2-4, 2010,
Reykjavik, Iceland (Vol. 155, p. 136). IOS Press.
- Maldonado, J. A., Moner, D., Bosca, D., Angulo, C., Marco, L., Reig,
E., & Robles, M. (2011, July). Concept-based exchange of healthcare
information: The LinkEHR approach. In Healthcare Informatics, Imaging
and Systems Biology (HISB), 2011 First IEEE International Conference
on (pp. 150-157). IEEE.
- Martínez Costa, C., Menárguez-Tortosa, M., & Fernández-Breis, J. T.
(2011). Clinical data interoperability based on archetype
transformation. Journal of biomedical informatics, 44(5), 869-880.
- Moner, D., Moreno, A., Maldonado, J. A., Robles, M., & Parra, C.
(2012, August). Using archetypes for defining CDA templates. In MIE
(pp. 53-57).
- Moner D. LinkEHR Studio: a tool for archetype-based data
transformations. Arctic Conference 2014
(http://vimeo.com/channels/764149)
Model transformations:
- Martínez-Costa, C., Menárguez-Tortosa, M., & Fernández-Breis, J. T.
(2010). An approach for the semantic interoperability of ISO EN 13606
and OpenEHR archetypes. Journal of biomedical informatics, 43(5),
736-746.
- Martínez-Costa, C., Bosca, D., Legaz-García, M. C., Tao, C.,
Fernández, B. J., Schulz, S., & Chute, C. G. (2012). Isosemantic
Rendering of Clinical Information Using Formal Ontologies and RDF.
Studies in health technology and informatics, 192, 1085-1085.
- Lezcano, L., Sicilia, M. A., & Rodríguez-Solano, C. (2011).
Integrating reasoning and clinical archetypes using OWL ontologies and
SWRL rules. Journal of biomedical informatics, 44(2), 343-353.
- Detailed Clinical Models to facilitate inter-standard
interoperability of data types. Diego Boscá, José Alberto Maldonado,
David Moner, Montserrat Robles. XXIII International Conference of the
European Federation for Medical Informatics (MIE 2011), Oslo;
Proceedings (2011)
GUI
- Menárguez-Tortosa, M., Martínez-Costa, C., & Fernández-Breis, J. T.
(2012). A generative tool for building health applications driven by
iso 13606 archetypes. Journal of medical systems, 36(5), 3063-3075.
- Brass, A., Moner, D., Hildebrand, C., & Robles, M. (2010).
Standardized and flexible health data management with an archetype
driven EHR system (EHRflex). Studies in health technology and
informatics, 155, 212.
One about combining all the above
- Maldonado, J. A., Costa, C. M., Moner, D., Menárguez-Tortosa, M.,
Boscá, D., Miñarro Giménez, J. A., ... & Robles, M. (2012). Using the
ResearchEHR platform to facilitate the practical application of the
EHR standards. Journal of biomedical informatics, 45(4), 746-762.
Transformations for the use of archetypes for clinical guidelines
- Marcos, M., Maldonado, J. A., Martínez-Salvador, B., Moner, D.,
Boscá, D., & Robles, M. (2011). An archetype-based solution for the
interoperability of computerised guidelines and electronic health
records. In Artificial Intelligence in Medicine (pp. 276-285).
Springer Berlin Heidelberg.
(there are plenty of papers on the modeling of clinical guidelines in openEHR)
Transformations of archetypes for the validation of clinical data
- Pfeiffer, Klaus, Georg Duftschmid, and Christoph Rinner. “Validating
EHR Documents: Automatic Schematron Generation Using Archetypes.”
Studies in Health Technology and Informatics 198 (2014): 101–7.
We are currently working on a paper for the generation of
implementation guides from archetypes. Archetypes are transformed into
NRL (natural rules language), Schematron and other validation
artifacts
If you don't have access to any of the above papers I can probably
provide you with preprints.