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-HTML as 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 DVBHTML. The format described in Annex E is intended 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. It is noted that there are other formats such as ETSI MHEG-5 (and the version in preparation specifying extended interactive services)@ which contain declarative functions are not covered in this Recommendation. However@ the migration from environments in current use to the harmonized environment is assisted by the identification of a common core and the translation using the intermediate format.