title: SpEL templates mixing expressions and literals
body: <p>how can i parse a "complex" template-like SpEL expression that mixes literal text and actual #{SpEL expressions}?  for example: </p>
  
  <pre><code>the dog says #{dog.getSound()}
  </code></pre>
  
  <p>Apache Camel supports this template-like capability in its expression languages (including SpEL), but i haven't been able to root out how to accomplish this directly with vanilla SpEL.  </p>