Example of using external DTD in XML document

<?xml version="1.0"?>

<!DOCTYPE earth SYSTEM "earthArea.dtd">

<!-- Above statements are prolog -->

 <earth totalArea="100">

    <!-- Area given below is in percentage -->

    <?Country mapping?>

    <country>Russia</country>

    <capital>Moscow</capital>

    <area>11.5</area>

    <country>Canada</country>

    <capital>Ottawa</capital>

    <area>6.7</area>

    <country>USA</country>

    <capital>Washington</capital>

    <area>6.5</area>

    <country>India</country>

    <capital>Delhi</capital>

    <area>2.3</area>

 </earth>