Exporting full-fidelity model and/or tuned UML export

Are there any options or macros that will export a model without data loss. Also, is the source available for any of the exports, like UML? Is there an OWL export?

I have exported to UML-2 but there are issues with the way relationships and enumerations are handled and the source metadata is not available to fix it. So I would either like to "tune" an export or export an entire model and then decide how to translate it to other formats.