Digitalisation of TV broadcast (Digital Terrestrial Television, DTT) is going to modify the way of work of many local televisions and content providers. In Catalonia (northeast of Spain) this will certainly happen since many current channels will not get a DTT license to broadcast. In this context, they need to get facilities for content selling and interchange in order to cover more audience and be able to use new different distribution channels, like second generation Internet. The “Xarxa IP Audiovisual de Catalunya” (XAC, Audiovisual IP Network of Catalonia) project aims to develop a marketplace for television content providers, defining mechanisms for searching, cataloguing and selling television programs in a secure way, also considering Digital Rights Management (DRM) issues. It must be noted that the project also considers other audiovisual content providers, such as the educational ones. In order to be able to perform searches over heterogeneous environments, a metadata set (XAC-MS) has been defined. Alignment of XAC-MS with standards like MPEG-7, MPEG-21 and TV-Anytime has been done to promote future standardisation of the metadata set.