element  PrincipalDesignReference  
diagram
version V3_2
namespace http://www.wipo.int/standards/XMLSchema/ST96/Design
type xsd:string 
used by
complexType     dgn:PrincipalDesignRelationType 
source <xsd:element  name="PrincipalDesignReference"  type="xsd:string">
<xsd:annotation>
<xsd:documentation>
Reference to the specific design contained in the document
</xsd:documentation>
</xsd:annotation>
</xsd:element>