 in order to describe what data is shared
or published. This metadata is defined in an <em>SDMX registry</em> where data
producers can download or query the necessary metadata. Alternatively metadata
is distributed in a so-called <em>Data Structure Definition</em> (DSD) file, which is
usually an XML format. Both types of modes should result in exactly the same
metadata agreements.</p>
<p>SDMX registries can be accessed through a <a href="https://en.wikipedia.org/wiki/Representational_state_transfer">REST
AP