There are many confusing definitions of metadata, not helped by the fact that one man's data is another man's metadata. We will use a very simple definition by exclusion.
Metadata is everything other than the raw data that we will analyse.
This definition runs the risk of being too broad, but there is a greater danger from too little metadata being stored and shared rather than too much, so anything that might accidentally lead to an over abundance of metadata is a risk worth taking.
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