Open Source Xml Editor

I need to write a XML-based markup language. I'd like to provide an open source IDE for it, but I don't want to write it from scratch. So, I'm looking for an open source XML editor, written in C#, with WinForms or WPF UI, which I'll can extend it and add my markup language validation and etc, with the following features:

• XML Syntax Highlighting like VS
• Auto Completion
• Validation

It's license should be that I can edit it and then release i开发者_如何学编程t, with the source code.

Are there any things like that?

Thanks.

Here is a good list:

• DINAMIC XML Editor(Written all in C#)
• Open eXeed
• Serna Free - Open Source XML Editor
• XML Pro
• Jaxe
• Xerlin
• Rose India - Open Source XML Editor
• Open source XML editors examined
• Re: Open Source XML Editor
• Open Source XML Editor In Sight
• Emacs
• ViM

Greg's Xml Editor is exactly what I need. Thanks anyway.

Try XmlAutoComplete - WPF control, written in C#, Net4.0

I use emacs. you can try sgml-mode or nxml-mode.