A new edition of the ISO international standard on the International Standard Serial Number (ISSN) – ISO 3297: 2007 – has just been published. The main new feature is the Linking ISSN or ISSN-L.The ISSN-L is a mechanism which enables collocation or linking among different media versions of a continuing resource. While keeping a separate ISSN assigned to each of the various media versions of a title, it will be possible to designate one single ISSN-L for all those media versions of the title. Among other improvements, the ISSN-L will facilitate search, retrieval and delivery across all media versions for services like OpenURL, library catalogues, search engines, or knowledge bases.