The optional label attribute is the model entity "nameplate". Normally it can be seen at the entity item in the project tree.
Source
<xs:element name="DisplayStyle" type="DisplayStyleType" maxOccurs="unbounded"><xs:annotation><xs:documentation>Each DisplayStyle element defines a display style.</xs:documentation></xs:annotation></xs:element>
The required n attribute is the number of display styles in this set.
Source
<xs:complexType name="DisplayStyleSetType"><xs:annotation><xs:documentation>The DisplayStyleSetType defines a collection of display style types.</xs:documentation></xs:annotation><xs:sequence><xs:element name="DisplayStyle" type="DisplayStyleType" maxOccurs="unbounded"><xs:annotation><xs:documentation>Each DisplayStyle element defines a display style.</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 display styles 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 display styles in this set.</xs:documentation></xs:annotation></xs:attribute>