title: How to use schema.org's actions to describe typical forms on websites?
body: <p>I recently stumbled upon <a href="http://schema.org/docs/full.html#Action" rel="nofollow">actions within the schema.org vocabulary</a>. As far as I understood them, they can be used to label forms and signalize their type of action.</p>
  
  <p>As I want to label the actions on websites I manage, I am not sure how to label typical use cases I have found.</p>
  
  <p>This are the cases I have currently deployed. Some are quite clear, others are rather fuzzy and for some of them I did not find any correspondent class at all. </p>
  
  <p><strong>Would you keep this labelling?</strong> </p>
  
  <ul>
  <li>search=SearchAction</li>
  <li>contact=CommunicateAction</li>
  <li>login=CheckInAction</li>
  <li>register=RegisterAction</li>
  <li>newsletter=SubscribeAction</li>
  <li>feedback=InformAction</li>
  <li>comment=CommentAction</li>
  </ul>
  
  <p><strong>And, how would you label this cases?</strong></p>
  
  <ul>
  <li>upload_files=?</li>
  <li>reset_pw=?</li>
  <li>filter=?</li>
  <li>abuse=?</li>
  <li>poll=?</li>
  <li>add2cart=? </li>
  <li>orderby=?</li>
  </ul>
  
  <p>'filter' is the typical limitation of a resultset and 'orderby' is to change the order of a resultset by some criteria.</p>
  
  <p>Cross Posting: <a href="https://github.com/schemaorg/schemaorg/issues/1149" rel="nofollow">https://github.com/schemaorg/schemaorg/issues/1149</a>. </p>