International audienceThis paper analyzes the main lines that structure the process of standardization of open data in France by confronting the discourses of producers and those of professional data re-users. How do open data standards contribute to the interoperability and durability of information serving the knowledge commons? In the information-communication approach to digital standards, the analyses are based on a documentary corpus, a corpus of metropolitan open data portals and on a two-year field survey of stakeholders in the French open data ecosystem, conducted for the ANR project 14-CE24-0029 OpenSensingCity. The choice of standards for publishing open data sets and their metadata have a decisive impact on data collection and p...