This Recommendation is intended to harmonize the application environment for declarative content for interactive TV. It specifies common elements, media types and APIs at the syntactic level of the declarative application environment to satisfy regional application requirements for the four standards ACAP-X, BML, Ginga-NCL and DVB-HTMLas specified in the normative references below. This Recommendation is divided into six annexes. Annex A describes the common core for XHTML-related technologies of the four standards. Annex B describes additional functionality outside the common core for BML. Annex C describes additional functionality outside the common core for ACAP-X. Annex D describes additional functionality outside the common core for DVB-HTML. The format described in Annex E isintended as the intermediate format for translation between formats including the common core and the standards covered in this Recommendation. The format described in Annex F is a framework to bind content authored in multiple formats into single content.