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
I use emacs. you can try sgml-mode or nxml-mode.
Here is a good list:
Greg's Xml Editor is exactly what I need. Thanks anyway.
Try XmlAutoComplete - WPF control, written in C#, Net4.0