The required n attribute is the number of Id elements in this array.
Source
<xs:element name="Ids" type="ArrayReferenceType" minOccurs="0"><xs:annotation><xs:documentation>The optional Ids element is the array of QIF id references.</xs:documentation></xs:annotation></xs:element>
Complex Type StatsNonNegativeIntegerWithReferencesType
Annotations
The StatsNonNegativeIntegerWithReferencesType defines a non negative integer statistical result and optionally defines a list of references to QIF ids associated with this value.
<xs:complexType name="StatsNonNegativeIntegerWithReferencesType"><xs:annotation><xs:documentation>The StatsNonNegativeIntegerWithReferencesType defines a non negative integer statistical result and optionally defines a list of references to QIF ids associated with this value.</xs:documentation></xs:annotation><xs:complexContent><xs:extension base="StatsNonNegativeIntegerType"><xs:sequence><xs:element name="Ids" type="ArrayReferenceType" minOccurs="0"><xs:annotation><xs:documentation>The optional Ids element is the array of QIF id references.</xs:documentation></xs:annotation></xs:element></xs:sequence></xs:extension></xs:complexContent></xs:complexType>