Initial investigations aren’t good – I remember now why there is no explicit eaDocX support for the Rule Composer: the data it creates is not available via the EA API, nor is is even visible in the raw database. It seems they may have put the critical data into a binary field. I have a asked a question with Sparx Tech Support, so I’m waiting for a reply.
I’ve also asked The Man on the internals of EA ( Mr. “qwerty” on the EA forums) if he understands it, and he’s also looking.
Perhaps you might also put a question on the EA forum?