like any good free IDE's that allow you to mess around with xml related technologies?

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I used this in school however I think you need to buy the license: http://www.altova.com/products/xmlspy/xml_editor.html

For free editors, you can try:
1) http://www.xmlcooktop.com/
2) http://www.freedownloadscenter.com/Best/free-xml-ide.html

Hope that these will help you.

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