A reference to an attribute group is created within an element, complex type, or attribute group, and makes the referenced attribute group available to its parent. You can create a reference to an attribute group as follows:
You can create an attribute group in the following way:
On the Attributes tab of the property sheet of an element, complex type, or attribute group, click the Add Group with Reference to Group tool (see Element Properties).
For general information about creating objects, see the Objects chapter in the Core Features Guide.