4.1 Metadata system(s)
For both statistical and non-statistical sphere, the metadata are disseminated in e-resources according to Dublin Core metadata standard. Dublin Core metadata standard is considered as the most popular universal metadata system from internet resources using standpoint. This standard simplifies access of producers and users of statistical data to global information network by means of small amount. Dublin Core metadata standard is also used for preparation of metadata catalogue and indicating the existing data sources. Moreover, in international practice Statistical Data and Metadata eXchange standards (SDMX) are more preferable for statistical data and metadata exchange. Recommended by Eurostat and consisted of 21 concepts and they sub concepts, these standards are prepared for statistical purposes and will be the main standards in the next future. The eXtensible Markup Language (XML) format is used in these standards for description and exchange of metadata. Based on SDMX standards, the countries could easily integrate all disseminated data with its own metadata system; also the international organizations obtain single access to the countries’ metadata. Along with Dublin Core and SDMX, one of the best examples in the field of documentation of statistical processes is Data Documentation Initiatives (DDI). DDI standard is mainly used for internal use, Dublin Core and SDMX- processes is foreseen for user. This standard is of XML format and makes possible integration of processes by web technologies.