title: XML Schema Constraint
body: <p>I have an XML schema that contains the following line.</p>
  
  <pre><code>&lt;Customer Customer_Id = "c5" Age = "24" Years_Of_Membership = "26"&gt;
  </code></pre>
  
  <p>Is it possible for me to make a constraint that the value of Years_Of_Membership must be less than the value of Age?</p>
  
  <p>Thanks</p>