title: overpass api - requesting any node that has tag
body: <p>I was wondering if it's possible to request via overpass API "any node that has at least one tag of any kind".
  The only way I see right now is to sopecify all the existing tags in a huge union request (see below), or requesting nodes without the "tag filtering" at all, and getting many nodes that have no tag at all.
  I will appreciate if you know a better solution.
  Thanks!</p>
  
  <pre><code>[out:json];
  (
    node
      ["name"]
      (50.6,7.0,50.8,7.3);
    node
      ["amenity"]
      (50.6,7.0,50.8,7.3);
    AND SO ON (SPECIFY ALL THE OTHER TAGS)
  );
  out;
  </code></pre>