The required index attribute is an index identifying a logical operation within the LogicalOperations set.
Source
<xs:element name="LogicalOperation" type="LogicalOperationType" maxOccurs="unbounded"><xs:annotation><xs:documentation>Each LogicalOperation element is a logical operation.</xs:documentation></xs:annotation></xs:element>
The required n attribute is the number of LogicalOperation elements in this set.
Source
<xs:complexType name="LogicalOperationsType"><xs:annotation><xs:documentation>The LogicalOperationsType defines a logical operations tree.</xs:documentation></xs:annotation><xs:sequence><xs:element name="LogicalOperation" type="LogicalOperationType" maxOccurs="unbounded"><xs:annotation><xs:documentation>Each LogicalOperation element is a logical operation.</xs:documentation></xs:annotation></xs:element></xs:sequence><xs:attribute name="n" type="NaturalType" use="required"><xs:annotation><xs:documentation>The required n attribute is the number of LogicalOperation elements in this set.</xs:documentation></xs:annotation></xs:attribute></xs:complexType>
<xs:attribute name="n" type="NaturalType" use="required"><xs:annotation><xs:documentation>The required n attribute is the number of LogicalOperation elements in this set.</xs:documentation></xs:annotation></xs:attribute>