title: XML DTD Specify a cdata/text pattern for attribute
body: <p>Is there a way, in a DTD, to specify a "pattern" for a given attribute.</p>
  
  <p>Example: I want to have an attribute called "<em>position</em>" which is a string of the form <strong>"X,Y"</strong>.</p>
  
  <p>I would like to have something in my DTD similar to: </p>
  
  <pre><code>&lt;!ATTLIST MyElement 
      myattribute "*,*"
  &gt;
  </code></pre>
  
  <p><em>(I know, for this example two attributes X and Y would certainly be better, but that's just to highlight what I want to do)</em></p>
  
  <p>Thanks</p>