Base type definition for threshold types. Specifies 'label' which is used to identify the specific threshold, along with the qualified name. Policy: opt-in-source The associated service(s) uses 'willing', or 'ignore' as opt-in indicator. The default is 'ignore' which means no opt-in indicator is relevant. Policy: applicable-access-network-type Indicator of applicable access network for the given communication service. Policy: threshold-value-equals Comparison operation (equality) threshold for 'label' for qualified element name 'qn-elem' with value specified as 'value'. Policy: threshold-value-less-than Comparison operation (less-than) threshold for 'label' for qualified element name 'qn-elem' with value specified as 'value'. Policy: threshold-value-greater-than Comparison operation (greater-than) threshold for 'label' for qualified element name 'qn-elem' with value specified as 'value'. Policy: unavailable-activities-set Used to describe all activities related to an application or enabler that would render an individual unavailable. Policy: undef-barring-state Indicate how to interpret the absence or omission of specific <barring-state> sub-elements in presence meta-data. Policy: undef-registration-state Indicate how to interpret the absence or omission of specific <registration-state> sub-elements in presence meta-data. Default value of 'ignore' indicates that the sub-element has no meaning in this context. Policy: undef-willingness Indicator of how to interpret absence or omission of <willingness> sub-element for the given service. Default value is 'closed/indefinite'.