title: Projectional Textual Editor?
body: <ol>
  <li>are there any textual, projectional Editors available? How do they work especially regarding updating subtrees?</li>
  <li>Are there any frameworks available for building them? </li>
  <li>Do you know any papers describing their design?</li>
  <li>How is this style of "parsing" called? </li>
  <li><p>Where do I start if I want to implement a textual projectional editor by myself?</p>
  
  <ul>
  <li>I would prefer using EMF / ECore, but that's optional. </li>
  <li>As far as I know, xText uses unidirectional transformations from text to model, or at least replaces Elements cascading / whole subtrees instead of updating them.</li>
  </ul></li>
  </ol>