Learning XML

Hey I am beginning to learn XML, It has been about 3 months since I started and I'm just getting the basics.

[code]
<ToBeHonestY>
   <tag>add something here</tag>
</ToBeHonestY>
[code]

So Anyone got any recommendations or sites/books I can expand my xml knowledge with?  I really want to add XML to my list of known languages/technologies.

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