About the character used, I was in favor of "_" before I read Brian's comment about "_" being vanishing when the URI is underlined. Considering the number of places where URIs are underlined (word underlines the URIs, web pages underline the URIs etc), I don't think using "_" will be a good idea.
I tend to agree. The underscore will cause more transcription and copying problems than it is worth.
Eric
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