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If you are simply wanting to edit the XML, you can do that as simple as using Notepad (or vi). You do not need a schema to edit an XML file. A schema is simply defines a structure/format that certain XML should adhere to and only if you validate the XML against the schema.
If you are wanting to create a schema based on an XML, many XML editors should offer this feature. Some of the pay ones are XMLSpy, Stylus Studio, and Oxygen XML Editor.