The id attribute is the QIF id of the datum target definition, used for referencing.
Source
<xs:element name="DatumTarget" type="DatumTargetType" maxOccurs="unbounded"><xs:annotation><xs:documentation>Each DatumTarget element gives information about a datum target definition.</xs:documentation></xs:annotation></xs:element>
The required n attribute is the number of datum target definitions in the list.
Source
<xs:complexType name="DatumTargetDefinitionsType"><xs:annotation><xs:documentation>The DatumTargetDefinitionsType defines a list of datum target definitions.</xs:documentation></xs:annotation><xs:sequence><xs:element name="DatumTarget" type="DatumTargetType" maxOccurs="unbounded"><xs:annotation><xs:documentation>Each DatumTarget element gives information about a datum target definition.</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 datum target definitions in the list.</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 datum target definitions in the list.</xs:documentation></xs:annotation></xs:attribute>