Discovery Service
Plain HTML
<html>
  <!--  HTML -->
  <form
      method="post"
      action="?entityID=https://aai-demo.switch.ch/shibboleth&return=https://aai-demo.switch.ch/Shibboleth.sso/Login?SAMLDS=1&target=cookie">
    <select
        name="user_idp">
      <option
          value="-">
        Select the Home Organization you are affiliated with ...
      </option>
      <!--  Other Home Organzations -->
      <option
          value="https://aai-demo-idp.switch.ch/idp/shibboleth">
        AAI Demo Home Organization (Shibboleth IdP 2.0)
      </option>
    </select>
    <input
        type="submit"
        name="Select"
        value="Select"/>
  </form>
  <!--  HTML -->
</html>