value space of "extends" attribute Info Item [2.2.2.2 WSL 2.0 Core Language]

Hi All,
I had a question.
Section 2.2.2.2 of WSDL 2.0 Core Language quotes
"The type of the extends *attribute information item* is a list of *xs:QName
*.".

Would it be better to explicitly mention that the type is list of QNames
that are "whitespace separated", or the fact that the "list" used here is
congruent with the "list" type as per XML Schema.
Am I missing something here ?
rgds,
Menon

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