| http://www.w3.org/ns/prov#value | - ide thereof, a phosphonic acid group or a salt, ester, or amide thereof, or, if Y is a direct bond, an amino or ammonium group or a halogen atom; Y represents a direct bond or a ???O???, ???S???, ???NR2???, ???SO2???, ???CO???, ???Alk2???, or ???Ar2??? bridging group or a chemically reasonable combination of one or more ???O???, ???S???, ???NR2???, ???SO2???, ???CO???, ???Alk2???, or ???Ar2??? gro
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