Hi, the first thing I notice is that your XML is not valid.
You should have only one root element and you have three (Sword, armor, potion). It should look like:
<items>
<swords></swords>
<potions></potions>
<armor></armor>
</items>
[/code:ktuz9q49]
Also these are valid ways of closing an element:
[code:ktuz9q49]
<item />
<item></item>
[/code:ktuz9q49]
but this isn't:
[code:ktuz9q49]<item/></item>[/code:ktuz9q49]