If you want to work with XML schema files that you created outside of the product, you can import them into the workbench and open them in the XML schema editor. The XML schema editor provides you with a structured view of the XML schema.
The following instructions were written for the Resource perspective, but they will also work in many other perspectives.
To import an XML schema into the workbench:
The imported schema now appears in the Navigator view. Double-click it to open it in the XML schema editor.