title: Polymer Dom-Repeat Binding to Content
body: <p>In polymer 1.2.3, Is it possible for a <code>dom-repeat</code> to use content as a template and bind values to the elements provided?</p>
  
  <p>Custom Element:</p>
  
  <pre><code>&lt;dom-module id="modify-collection"&gt;
    &lt;template&gt;
      &lt;div&gt;
        &lt;template is="dom-repeat" items="[[collection]]"&gt;
          &lt;content&gt;&lt;/content&gt;
        &lt;/template&gt;
      &lt;/div&gt;
    &lt;/template&gt;
  &lt;/dom-module&gt;
  </code></pre>
  
  <p>Usage:</p>
  
  <pre><code>&lt;modify-collection collection="{{things}}"&gt;
    &lt;list-item resource="[[item]]"&gt;&lt;/list-item&gt;
  &lt;/modify-collection&gt;
  </code></pre>
  
  <p>I've looked at the following resources without help: </p>
  
  <p><a href="https://stackoverflow.com/questions/24699624/polymer-how-to-watch-for-change-in-content-properties">Polymer: How to watch for change in &lt;content&gt; properties</a></p>
  
  <p><a href="https://stackoverflow.com/questions/30516697/polymer-1-0-template-bind-ref-equivalent">Polymer 1.0 template bind ref equivalent</a></p>
  
  <p><a href="https://stackoverflow.com/questions/23522037/data-binding-between-nested-polymer-elements">Data-binding between nested polymer elements</a></p>
  
  <p><a href="https://github.com/grappendorf/grapp-template-ref">https://github.com/grappendorf/grapp-template-ref</a></p>
  
  <p><a href="https://github.com/Trakkasure/dom-bindref">https://github.com/Trakkasure/dom-bindref</a></p>
  
  <p><a href="https://github.com/Polymer/polymer/issues/1852">https://github.com/Polymer/polymer/issues/1852</a></p>
  
  <p><a href="https://github.com/Polymer/polymer/pull/2196">https://github.com/Polymer/polymer/pull/2196</a>
  <hr>
  <strong>Update 2016-02-03</strong>: From the Polymer Team<a href="https://github.com/Polymer/polymer/pull/2196">(PR #2196)</a>, better support for this is planned in the future, to help address some of the shortcomings.</p>