This attribute identifies the classification data that is associated with this policy. It identifies either an individual classifier or a block of classifiers, based on the value of the ntnQosPolicyClassifierType attribute. A value of 'individualClfr(1)' means this value references entries in the Classifier Component Table (ntnClfrComponentTable) using the component set identifier. A value of 'blockOfClfrs(2)' means this value reference entries in the Classifier Block Table (ntnClfrBlockTable) using the classification block number Referenced classification data must be defined prior to being referenced. Version 1/2 attribute.