title: In Neo4j 2.0, can numbers be labels?
body: <p>I read in the documentation that labels can be string or numbers. However, using only numbers gives an error:</p>
  
  <pre><code>start u=node(5) set u:1234 return labels(u);
  </code></pre>
  
  <p>The error is:</p>
  
  <pre><code>Invalid input '1': expected whitespace or an identifier (line 1, column 23)
  </code></pre>