| http://www.w3.org/ns/prov#value | - Examples of the optionally substituted alkyl group having 1 to 8 carbon atoms represented by R3 and R4 include unsubstituted alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, hexyl, heptyl, octyl and the like as well as these alkyl groups substituted with one or more hydroxy groups, alkoxy groups as defined with respect to R2, halogen atoms (e.g., fluorine, c
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