title: Required Whitespace missing while validating DTD/XML
body: <p>I am using w3 schools validation tool to validate my xml file with my dtd. Here is what I have, but I get required whitespace missing:</p>
  
  <pre><code>&lt;?xml version="1.0" ?&gt; 
  &lt;!DOCTYPE COUNTRYINFO
  [
  &lt;!ELEMENT COUNTRY(NAME, POPULATION, AREA)&gt;
  &lt;!ELEMENT NAME(#PCDATA)&gt;
  &lt;!ELEMENT POPULATION(#PCDATA)&gt;
  &lt;!ELEMENT AREA(#PCDATA)&gt;
  ]&gt; 
  &lt;COUNTRYINFO&gt;
   &lt;COUNTRY&gt;
    &lt;NAME&gt;UNITED STATES&lt;/NAME&gt;
    &lt;POPULATION&gt;314867000&lt;/POPULATION&gt;
    &lt;AREA&gt;3794101&lt;/AREA&gt;
   &lt;/COUNTRY&gt;
  &lt;/COUNTRYINFO&gt;
  </code></pre>