// only expect a single argument that will name a device
assertArgumentCount(values, 1);
// Default to a UNKNOWN relationship
DeviceAncestorRelationship deviceRelationship =
DeviceAncestorRelationship.UNKNOWN;
// retrieve the DevicePolicyValueAccessor
DevicePolicyValueAccessor policyAccessor =
(DevicePolicyValueAccessor) expressionContext.getProperty(