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While the existing Checkstyle modules are targeted at the Java Language, the Checkstyle core engine is open to support other languages as well. I know for at least on extension to Checkstyle which adds support for another language (http://sourceforge.net/projects/checkstyle4ada/).
I think those users would be very unhappy if I would confine the plugin to Java projects.

I see your point, however, and I am looking for a way to make it configurable for which project natures the Checkstyle plugin should be offered. Currently I don't know if it is possible to do this dynamically.