XMI21 — Remarks to chapter "3.4.3 Derived Types and References" in XMI Spec. , v 2

Remarks to chapter "3.4.3 Derived Types and References" in XMI Spec. , v 2.0, S. 3-15
There it says:

"... An instance of Company can use xsi:type to
indicate that its HQAddress is actually of type USAddress and includes a zipcode:
<Company xmi:id="Company_1" name="Acme">
<HQAddress xmi:type="USAddress" xmi:id="Address_1"
Street="Side Street" City="Hometown" zipcode="90210"
... "
The 'HQAdress'-Element has a 'xmi:type'-Attribute. Parsing this with Xerces 2.4.0 gives problems, since a 'xsi:type' Attribute is required. Derived types must be specified with the 'xsi:type'-Attibute. Maybe the line
"... An instance of Company CAN use xsi:type ..."
should be changed in
" ... An instance of Company MUST use xsi:type ..."