<xs:complexType name="ToType">
<xs:sequence>
<xs:element name="to" maxOccurs="unbounded">
<xs:complexType>
<xs:complexContent>
<xs:extension base="abc:AddressType">
<xs:attribute name="xyz" type="xs:boolean"
default="true"/>
</
</
</
</xs:element>
</xs:sequence>
</xs:complexType>
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference