unmodified.

 <p>
 This is used for debugging purposes but also for the purposes of comparison (e.g. to ensure the expression in a
 configuration file has not changed).
 </p>

 <p>
 This method does not provide sufficient information to re-create an expression. Two different expressions can have
 exactly the same expression string but different function mappings. Serialization should be used to save and restore
 the state of an <code>Expression</code>.
 </p></div>
<dl>
<dt><span class="overrideSpecifyLabel"