An approach may reduce a frequency of subscription.Logical formLearned from2 sentences. A notifier may maintain a map of subscriptions to elements.Logical formLearned from2 sentences. (Subscription rights) can be for a subscriber.Logical formLearned from2 sentences. Subscriptions to collections may have feature.Logical formLearned from2 sentences. A subscription may contain a parameter.Logical formLearned from2 sentences. A document may preclude subscriptions to lists of resources.Logical formLearned from2 sentences. A system may perform a subscription with some duration.Logical formLearned from2 sentences. Subscription can be for (listener mobility).Logical formLearned from2 sentences. (Client subscription) can be to (ssm groups).Logical formLearned from2 sentences. Some groups can be under subscription of a node.Logical formLearned from2 sentences. A node may undergo a subscription.Logical formLearned from2 sentences. A subscription may suffer from handovers.Logical formLearned from2 sentences. A user may send a (presence subscription request) to a contact.Logical formLearned from2 sentences. A (presence system) may provide (presence subscription) to users.Logical formLearned from2 sentences. A (completion subscription) may undergo a suspension.Logical formLearned from2 sentences.