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Soit le schéma suivant. Quels documents sont valides ?
<xs:element name="livraison">
<xs:complexType>
<xs:sequence>
<xs:element name="colis" minOccurs="1" maxOccurs="2">
<xs:complexType>
<xs:sequence>
<xs:element name="article" type="xs:string"
maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="note" type="xs:string" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
</xs:element>