This read-create string object defines the VLAN membership of this OAMFlowPoint using the same comma-separated X-Y / X-* / *-Y / X1:X2 syntax as the regular FlowPoint membership list, determining which tagged OAM traffic this flow point classifies. An administrator populates this to ensure OAM protocol frames tagged with the right VLAN and priority are captured by this dedicated OAM flow point rather than falling into a regular service flow point. For example, matching this membership list to the same VLAN used by the associated service flow ensures OAM messages for that circuit are correctly segregated into their own monitoring flow point.