The Reference enum specifies whether a name pertains to a relation, permission, or attribute. - REFERENCE_UNSPECIFIED: Default, unspecified reference. - REFERENCE_RELATION: Indicates that the name refers to a relation. - REFERENCE_PERMISSION: Indicates that the name refers to a permission. - REFERENCE_ATTRIBUTE: Indicates that the name refers to an attribute.
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REFERENCE_UNSPECIFIED(value:'REFERENCE_UNSPECIFIED') -
REFERENCE_RELATION(value:'REFERENCE_RELATION') -
REFERENCE_PERMISSION(value:'REFERENCE_PERMISSION') -
REFERENCE_ATTRIBUTE(value:'REFERENCE_ATTRIBUTE')