Page content filling can be done by pointing your template (without a script) to an external update service (for example third party), that can return updated data using the Vizrt Data Format VDF.
In addition to the service mechanism, you can also select which actions are triggered on the Media Sequencer during an update (Read, Take etc.) and set the timeout for each action.
Tip: Vizrt has developed a small stub-implementation for an external update service called ExternalUpdateServiceSample for interested developers and third party integrators.
This project is available as source code on request from your Support organization at no cost. It can be used as a starting point for developing external update services.