http://www.w3.org/ns/prov#value | - Essentially, green means exact match on a complete date or place or name, yellow means the information matched but some pieces are missing (e.g., the date is a year only, or the place is just a country or a US state), or the information is a partial-match (e.g., the name sounds similar but is spelled differently, or one place is a county but the other one includes the town also).
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