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By definition, metadata is outside the document as you might read it (although it might be included.) So, usefulness depends on the reader software. The standardized Dublin Core metadata would be available for whatever system might want it, although most readers fail to make much use of it.
Of course, as it's machine readable, it can be used for a lot of purposes besides reading.
Don't mistake the current level of exploitation as the ceiling of what is possible. It's always good to add good metadata and clean markup. Future-you, and others, will appreciate it.
m a r
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