The xsd2cnd converts JackRabbit custom XML node-types definitions into compact node type definition format, which is described in the standard.
This was written as a replacement for https://github.com/ceefour/xsd2cnd which is obsolete and non-trivial to compile (it's based on Maven 1.0 & JR 1.0)
Usage:
$ java -jar xsd2cnd.jar custom-nodetypes-file.xml