Summary

Recommendation ITU-T J.201 identifies the functional commonality among the declarative application environments for interactive TV application specifications DVB-HTML, ACAP-X and BML. Based on the analysis of such commonality, this Recommendation describes the harmonized declarative application environment and additional elements to implement those specifications. It complements the harmonized procedural applications environment in Recommendation ITU-T J.202 whose relationship with the declarative environment is described in Recommendation ITU-T J.200. Common elements, media types, and APIs of the declarative environment are specified and additional elements to satisfy regional requirements are identified. This harmonization assists content authors to create internationally exchangeable programmes and provides an opportunity to obtain the benefits of economies of scale.