<xs:attributeGroup name="occurs"> <xs:annotation> <xs:documentation> for all particles</xs:documentation> </xs:annotation> <xs:attribute name="minOccurs" type="xs:nonNegativeInteger" use="optional" default="1" /> <xs:attribute name="maxOccurs" type="xs:allNNI" use="optional" default="1" /> </xs:attributeGroup>