Abstract
DOIs (Digital Object Identifiers) have become essential in the scientific landscape for data citation and preservation. DOI design follows open data requirements: they are fully integrated in the Web architecture, and they provide a canvas of documented resources that can be linked by cross references. The key to success is the DOI metadata description and its documentation that improves the data visibility and citation. In this context, members of the Data Curation and Preservation (DCP) Interest Group of the International Virtual Observatory Alliance (IVOA) worked together to identify the state of the art of different aspects of the DOI in operation in astronomy. This state of the art shows different aspects for several types of data in the landscape - for example, the VizieR catalogue service of the Strasbourg Astronomical Data Center (CDS) provides DOIs for catalogues (tables and associated data). We highlight the status of the IVOA Note, and give feedback from the DOI implemention experience in VizieR.
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