Minimal domain for sphinx

I would like to use Sphinx for my own project and for that I want to create a new sphinx domain. But I have serious trouble getting started. My minimal sphinx domain would allow only a single instruction called 'command':

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.. xx:command:: Somecommand

I can't find any introduction to writing sphinx domains "on the internet", only some ready to run domains for ruby, erlang etc. Can someone advise me on how to get started?

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Checkout the reStructuredText domain in the Sphinx source code, it's fairly simple and should get you started. You may also find some good examples in the sphinx-contrib source.