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To be according XEP-0060, the element "items" must contain attribute "node", because it is required.
<xs:element name='items'>
xs:complexType
xs:choice
<xs:element ref='item' minOccurs='0' maxOccurs='unbounded'/>
<xs:element ref='retract' minOccurs='0' maxOccurs='unbounded'/>
</xs:choice>
<xs:attribute name='node' type='xs:string' use='required'/>
</xs:complexType>
</xs:element>