title: Keyword vs data metadata in DITA?
body: <p>There are two "generic" types of metadata tags in DITA, the data element and the keyword element. Of course there's also the othermeta, but apparently that's supposed to be deprecated soon, and the name suggests its sort of a last resort anyhow.</p>
  
  <p>So the keyword seems to closely resemble tags in web applications, i.e. what is commonly used for "folksonomies". But what is the exact difference between data and keyword, and when should you use which?</p>