title: Are Ant path-like structures immutable like properties?
body: <p>The Ant manual is pretty clear that <a href="https://ant.apache.org/manual/Tasks/property.html" rel="nofollow noreferrer">properties are immutable</a> (<em>ie</em> once a property value is set it cannot be changed by subsequent <code>&lt;property&gt;</code> element):</p>
  
  <blockquote>
    <h2>Property</h2>
    
    <h3>Description</h3>
    
    <p>Sets a property (by name and value), or set of properties (from file or resource) in the project. Properties are case sensitive.</p>
    
    <p><strong>Properties are immutable</strong>: whoever sets a property first freezes it for the rest of the build; they are most definitely not variables.</p>
  </blockquote>
  
  <p>I'm trying to understand whether the same is true <a href="http://ant.apache.org/manual/using.html#path" rel="nofollow noreferrer">path-like structures</a> like <code>&lt;path&gt;</code>, <code>&lt;classpath&gt;</code>, and so on. It's not jumping out at me in the Ant manual.</p>