<p>Sure, I'll go ahead and merge this.  I've been reading a bit about Spirit, it seems very weird-looking, so please be sure to document thoroughly what everything does, so that some maintainer who doesn't know what Spirit is can have some idea of how the code works.</p>

<p>What version of Spirit are you planning to use?  I think we should stick with Spirit 2 (I guess 2.5 and up?) since that is available from Boost 1.47 onwards.</p>

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