ant/org.eclipse.ant.ui/Ant Tools Support/org/eclipse/ant/internal/ui/preferences/SyntaxPreviewCode.txt

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE project   [
<!ENTITY common SYSTEM "common.xml">
]>
<project default="greetings">
	&common;
    <target name="greetings">
    <!--Saying HI
    to the world-->
        <echo>
             Eclipse!
        </echo>		  
    </target>
</project>