The following concrete components resolve to the following abstract components:

The figure above illustrates how some concrete components resolve to the other concrete components:

• XSDModelGroupDefinition: a group reference resolves to a global group
• XSDAttributeGroupDefinition: an attribute group reference resolves to a global attribute group
• XSDElementDeclaration: an element declaration reference resolves to a global element declaration
• XSDAttributeDeclaration: an attribute declaration reference resolves to a global attribute declaration