| http://www.w3.org/ns/prov#value | - wherein M is a group containing two or more aromatic rings bridged by a rigid central linkage selected from the group consisting of a direct bond, --CR.sup.1 .dbd.CR.sup.1 --, --C.vertline.C--, --N.dbd.N--, --CR.sup.1 .dbd.N--, --CR.sup.1
|
