| http://www.w3.org/ns/prov#value | - each W is a linker and may be the same or different such as a chemical bond; optionally substituted alkylene, preferably C1-12 alkylene, more preferably C1-6 alkylene; optionally substituted alkenylene, preferably C2-12 alkenylene, more preferably C2-6 alkenylene; optionally substituted alkynylene, preferably C2-12 alkynylene, more preferably C2-6 alkynylene; optionally substituted heteroalkylene,
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