MLW-LT, an FP7 funded coordination action, is going to set up a W3C Working Group (WG) for standardizing metadata exchange between Web CMS, Localization Tools and Language Technologies. This session will open the public discussion of the WG Charter and encourage participation in the WG from outside of the initial EC funded consortium. The WG aims to address three major interoperability gaps in the multilingual web content lifecycle, namely between Deep Web meta-data and localization (L10n); Surface Web meta-data and Real time Machine Translation; and Deep Web meta-data and meta-data driven MT training. Addressing these gaps will include alignment with other existing and ongoing LT and L10n standardization activities; prominently W3C ITS and OASIS XLIFF TC effort, as XLIFF will be used for prototyping MLW-LT metadata round-trips in the three main scenarios outlined above.