Msg#: 3785699 posted 12:47 am on Nov 15, 2008 (gmt 0)
You're probably seeking an XML editor with features like validation, syntax checking, and possibly even GUI-based DTD, XSLT, XPATH etc? I don't know of any free ones, though several good commercial packages have trial versions.
In the free zone I'd recommend Notepad++. It's not an XML editor per se, but it does a nice job of colorizing and highlighting XML, and comes with a bunch of plugins for checking well-formedness, finding nodes, and more.
moderator's note: please do not evangelize commercial products. But free ones are OK to mention by name as long as they're actually 100% free.