I have not used this program before, but will check it out.
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After looking at it, I don't believe XML Notepad has this feature; what a crappy product!
If you are using an XSL to transform the XML, you can create a doctype in your result xml, by using <xsl:output>' s doctype-public and doctype-system attributes. See http://www.w3schools.com/xsl/el_output.asp
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