<Middle-ages 
xmlns:xlink="http://www.w3.org/1999/xlink/namespace">
<!—This is warfare.xml-->
[lots of text and markup here]
These <xlink:extended
role="xlink:external-linkset"
title="Description of Weapons"
<xlink:locator href= "weaponlinkset.xml"/> weapons
<xlink:extended>
revolutionized medieval warfare, making it more lethal and bloody
[lots more text and markup here]
</Middle-ages>