The capabilities for the event service is returned in the Capabilities element. Indicates that the WS Subscription policy is supported. Indicates that the WS Pull Point is supported. Indicates that the WS Pausable Subscription Manager Interface is supported. Maximum number of supported notification producers as defined by WS-BaseNotification. Maximum supported number of notification pull points. Indication if the device supports persistent notification storage. Optional XPATH expression to select specific topics. Initial termination time. Refer to Web Services Base Notification 1.3 (WS-BaseNotification). Endpoint reference of the subscription to be used for pulling the messages. Current time of the server for synchronization purposes. Date time when the PullPoint will be shut down without further pull requests. Maximum time to block until this method returns. Upper limit for the number of messages to return at once. A server implementation may decide to return less messages. The date and time when the messages have been delivered by the web server to the client. Date time when the PullPoint will be shut down without further pull requests. List of messages. This list shall be empty in case of a timeout. Maximum timeout supported by the device. Maximum message limit supported by the device. The date and time to match against stored messages. Reverse the pull direction of PullMessages. List of topic namespaces supported. True when topicset is fixed for all times. Set of topics supported. Defines the XPath expression syntax supported for matching topic expressions.
The following TopicExpressionDialects are mandatory for an ONVIF compliant device :

• http://docs.oasis-open.org/wsn/t-1/TopicExpression/Concrete
• http://www.onvif.org/ver10/tev/topicExpression/ConcreteSet.

Defines the XPath function set supported for message content filtering.
The following MessageContentFilterDialects should be returned if a device supports the message content filtering:

• http://www.onvif.org/ver10/tev/messageContentFilter/ItemFilter.

A device that does not support any MessageContentFilterDialect returns a single empty url. Optional ProducerPropertiesDialects. Refer to Web Services Base Notification 1.3 (WS-BaseNotification) for advanced filtering. The Message Content Description Language allows referencing of vendor-specific types. In order to ease the integration of such types into a client application, the GetEventPropertiesResponse shall list all URI locations to schema files whose types are used in the description of notifications, with MessageContentSchemaLocation elements.
This list shall at least contain the URI of the ONVIF schema file. Optional ONVIF defined pull point subscription policies The pullpoint should not provide Initialized nor Deleted events for Properties. Returns the capabilities of the event service. The result is returned in a typed answer. This method returns a PullPointSubscription that can be polled using PullMessages. This message contains the same elements as the SubscriptionRequest of the WS-BaseNotification without the ConsumerReference.
If no Filter is specified the pullpoint notifies all occurring events to the client.
This method is mandatory. The WS-BaseNotification specification defines a set of OPTIONAL WS-ResouceProperties. This specification does not require the implementation of the WS-ResourceProperty interface. Instead, the subsequent direct interface shall be implemented by an ONVIF compliant device in order to provide information about the FilterDialects, Schema files and topics supported by the device. This method pulls one or more messages from a PullPoint. The device shall provide the following PullMessages command for all SubscriptionManager endpoints returned by the CreatePullPointSubscription command. This method shall not wait until the requested number of messages is available but return as soon as at least one message is available.
The command shall at least support a Timeout of one minute. In case a device supports retrieval of less messages than requested it shall return these without generating a fault. This method readjusts the pull pointer into the past. A device supporting persistent notification storage shall provide the following Seek command for all SubscriptionManager endpoints returned by the CreatePullPointSubscription command. The optional Reverse argument can be used to reverse the pull direction of the PullMessages command.
The UtcTime argument will be matched against the UtcTime attribute on a NotificationMessage. Properties inform a client about property creation, changes and deletion in a uniform way. When a client wants to synchronize its properties with the properties of the device, it can request a synchronization point which repeats the current status of all properties to which a client has subscribed. The PropertyOperation of all produced notifications is set to “Initialized”. The Synchronization Point is requested directly from the SubscriptionManager which was returned in either the SubscriptionResponse or in the CreatePullPointSubscriptionResponse. The property update is transmitted via the notification transportation of the notification interface. This method is mandatory.