Here’s a tool I really like, for editing XML files, especially ones that have useful “human readable” representations, like XHTML:

[1] XMLmind XML Editor

Features:

• There’s a “free” version (lacking some features). Professional version isn’t unreasonable for a single seat.
• Written in Java so it’s cross platform
• You can easily create new templates for new XML schemas (just create or point at a [2] DTD and a [3] CSS stylesheet from a valid, minimal, but otherwise empty XML file conforming to the DTD)
• Has a plug-in architecture, and there are a few plugins you can get right from their site, as well as write your own.

I find myself using it to edit [4] XHTML, [5] DocBook and other XML file types (e.g. [6] DITA).

The advantage over something like [7] JEdit is that rather than telling you when you create invalid markup, it won’t let you create invalid markup. And it certainly won’t let you create non-well-formed markup. (If the preceeding distinction isn’t clear then read the definitions of [8] well-formed and [9] valid.)

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