The required n attribute is the number of polyline curves in this set.
Source
<xs:element name="Polylines" type="Polylines2dType" minOccurs="0"><xs:annotation><xs:documentation>The optional Polylines element is a set of 2D polylines.</xs:documentation></xs:annotation></xs:element>
The required n attribute is the number of areas in this set.
Source
<xs:element name="Areas" type="Areas2dType" minOccurs="0"><xs:annotation><xs:documentation>The optional Areas element is a set of 2D areas.</xs:documentation></xs:annotation></xs:element>
The GraphicsType defines additional graphical presentation data. These visualization data allow specifying user-defined 3D annotations that have no semantic representation in a QIF file.
<xs:complexType name="GraphicsType"><xs:annotation><xs:documentation>The GraphicsType defines additional graphical presentation data. These visualization data allow specifying user-defined 3D annotations that have no semantic representation in a QIF file.</xs:documentation></xs:annotation><xs:sequence><xs:element name="Polylines" type="Polylines2dType" minOccurs="0"><xs:annotation><xs:documentation>The optional Polylines element is a set of 2D polylines.</xs:documentation></xs:annotation></xs:element><xs:element name="Areas" type="Areas2dType" minOccurs="0"><xs:annotation><xs:documentation>The optional Areas element is a set of 2D areas.</xs:documentation></xs:annotation></xs:element></xs:sequence></xs:complexType>