title: Can GeoJSON FeatureCollections be used to create PostGIS geometries using ST_GeomFromGeoJSON?
body: <p>It's a simple question which I have yet to find a definite answer. On the specs page for <code>ST_GeomFromGeoJSON</code>, it states:</p>
  
  <blockquote>
    <p>ST_GeomFromGeoJSON works only for JSON Geometry fragments. It throws
    an error if you try to use it on a whole JSON document.</p>
  </blockquote>
  
  <p>Does this refer to a FeatureCollection?</p>
  
  <p>If it is not possible, is there a standard workaround to store FeatureCollection-esque data as geometries?</p>