Architecting and designing : XML schema design : Creating a new XML diagram : Creating a new diagram
  
Creating a new diagram
When creating a new XML diagram, you will need to attach an XML schema definition to the diagram’s property set. You may reuse an existing schema definition or create a new one at diagram creation time.
To create a new diagram, do one of the following:
▪On the File menu, click New Diagram.
▪Click the New Diagram icon.
See also
Creating a new XML diagram