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MachineTagBook

Machine tags (MachineTag) are just standard tag with extra information to extend the information in the tag. They are called machine tags because there are often use by program to get extra information from the tagged work.

example of use

book:isbn=3791337335 (ISBN-10 versus ISBN-13 ?)
book:isbn=9783791337333
book:lang=en

why not using iso or urn as namespace?