  The situation of data sharing in astronomy is positioned in the current
general context of a political push towards, and rapid development of,
scientific data sharing. Data is already one of the major infrastructures of
astronomy, thanks to the data and service providers and to the International
Virtual Observatory Alliance (IVOA). Other disciplines are moving on in the
same direction. International organisations, in particular the Research Data
Alliance (RDA), are developing building blocks and bridges to enable scientific
data sharing across borders. The liaisons between RDA and astronomy, and RDA
activities relevant to the librarian community, are discussed.
