XML file with links to others XML files

[wxdqz]

I have the following xml file but it can become quite large because it is related to a family genealogy. Is there a way of introducing a link to another XML file?

<?xml version="1.0" encoding="UTF-8"?>
<family>
<relative id="1">
<name></name>
<birth></birth>
<death></death>
<fwife>
<name></name>
<birth></birth>
<death></death>
</fwife>
<descendants>
<relative id="11">
<name></name>
<birth></birth>
<death></death>
<fwife>
<name></name>
<birth></birth>
<death></death>
</fwife>
<descendants>
<LINK TO ANOTHER XML FILE>
</descendants>
</relative>
</descendants>
</relative>
</family>

Thanks.