<!ENTITY ap_keyboard SYSTEM "keyboard.xml">
<!ENTITY ap_glossary SYSTEM "glossary.xml">
<!ENTITY ap_ack SYSTEM "ack.xml">
+ <!ENTITY ap_gpl SYSTEM "gpl.xml">
]>
<article>
<title>The Sylpheed-Claws User Manual</title>
&ap_keyboard;
&ap_ack;
&ap_glossary;
+ &ap_gpl;
</article>