The NonShapeFeatureNominalBaseType is the abstract base type for non-shape feature nominals. A non-shape feature nominal holds that portion of non-shape feature nominal information which cannot be shared among several features, e.g. feature location.
The id attribute is the QIF id of the feature, used for referencing.
Source
<xs:complexType name="NonShapeFeatureNominalBaseType" abstract="true"><xs:annotation><xs:documentation>The NonShapeFeatureNominalBaseType is the abstract base type for non-shape feature nominals. A non-shape feature nominal holds that portion of non-shape feature nominal information which cannot be shared among several features, e.g. feature location.</xs:documentation></xs:annotation><xs:complexContent><xs:extension base="FeatureNominalBaseType"/></xs:complexContent></xs:complexType>