You can create a new, empty XML file, which you can then edit in the XML editor. When you create a new, empty XML file, it is not associated with a DTD or XML schema file, so there are no restrictions on the kind of content it can contain.
The following instructions were written for the Resource perspective, but they will also work in many other perspectives.
To create an XML file from scratch, follow these instructions:
Related concepts
XML editor
Related tasks
Generating an XML file from a DTD
Generating an XML file from an XML schema
Editing XML files