A reception apparatus, comprising: a receiver configured to receive a triggered declarative object, TDO, that includes a notification of an alert service, wherein the TDO is a downloadable software object created by a content provider which includes declarative content whose function is tied to the content it accompanies; a display interface configured to present the notification of the alert service on a display when the received TDO is executed; an input unit configured to receive a request from a user to subscribe to the alert service via the TDO; and a processor configured to receive a trigger via a transport stream from the content provider after the TDO has been received by the receiver, wherein the trigger causes the processor to retrieve the TDO and to execute the TDO, such that the notification of the alert service is presented on the display, determine whether a request from the user to subscribe to the alert service is received, and when a request from the user to subscribe to the alert service has been received, register a location of new content information associated with the alert service in a memory, wherein the TDO identifies the location of the new content information associated with the alert service, monitor the new content information to determine whether new content corresponding to the alert service is available based on the new content information, and when the new content is determined to be available, download the new content and cause the display interface to present a pop-up alert based on the new content. a receiver configured to receive a triggered declarative object, TDO, that includes a notification of an alert service, wherein the TDO is a downloadable software object created by a content provider which includes declarative content whose function is tied to the content it accompanies; a display interface configured to present the notification of the alert service on a display when the received TDO is executed; an input unit configured to receive a request from a user to subscribe to the alert service via the TDO; and a processor configured to receive a trigger via a transport stream from the content provider after the TDO has been received by the receiver, wherein the trigger causes the processor to retrieve the TDO and to execute the TDO, such that the notification of the alert service is presented on the display, determine whether a request from the user to subscribe to the alert service is received, and when a request from the user to subscribe to the alert service has been received, register a location of new content information associated with the alert service in a memory, wherein the TDO identifies the location of the new content information associated with the alert service, monitor the new content information to determine whether new content corresponding to the alert service is available based on the new content information, and when the new content is determined to be available, download the new content and cause the display interface to present a pop-up alert based on the new content. receive a trigger via a transport stream from the content provider after the TDO has been received by the receiver, wherein the trigger causes the processor to retrieve the TDO and to execute the TDO, such that the notification of the alert service is presented on the display, determine whether a request from the user to subscribe to the alert service is received, and when a request from the user to subscribe to the alert service has been received, register a location of new content information associated with the alert service in a memory, wherein the TDO identifies the location of the new content information associated with the alert service, monitor the new content information to determine whether new content corresponding to the alert service is available based on the new content information, and when the new content is determined to be available, download the new content and cause the display interface to present a pop-up alert based on the new content. register a location of new content information associated with the alert service in a memory, wherein the TDO identifies the location of the new content information associated with the alert service, monitor the new content information to determine whether new content corresponding to the alert service is available based on the new content information, and when the new content is determined to be available, download the new content and cause the display interface to present a pop-up alert based on the new content.