A Schema corresponds to a UML package, which contains the type and element definitions for a particular targetNamespace. Drag this item onto an open diagram to create the package to contain your schema model elements. The package is stereotyped as XSDschema.

Open the logical diagram created under the XSDschema package and add additional schema elements as required.

To add an element to the current diagram, click on the required icon and drag it into position on the diagram. Set the name and other properties as prompted.

To add a relationship, click on the required icon, then click on the start element in the diagram and drag to the end element.