If you use Eclipse, be sure to select the Java EE version, or you can find web server tools, XML, and other Internet-related tools available in the update manager. I almost completely used the SpringSource ToolSuite, a proprietary version of Eclipse with several useful plugins, even if you are not using Spring, it has m2eclipse, WST, and several other useful plugins, predefined presets.
The good parts of the Eclipse XML editing tools are for WSDL and Schema, where you easily browse files and a graphical interface to render the file.
Otherwise, the basic XML editor is just a simple XML editor, with line coloring, some auto-completion, etc.
Note that not all XML tools were built the same way, and you can find one tool that says everything is valid and the other is not. The best known was with WSDL and schemas for web services.
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