[Pki-users] Any guide on how to design custom certificate profiles for FreeIPA Dogtag?

Currently I found only way to customize certificate profile is editing text file like caOtherCert.cfg. There are no manuals about file format, nor about possible classes or constants found (validityConstraintImpl, validityDefaultImpl, URIName, etc.) Please point me to any kind of tool or guide to help me designing certificate template usable with FreeIPA dogTag from stratch.