The type dcr:serviceFeatureListType provides a list of elements of the type dx:serviceFeatureType, which gives a list of service features belong to the certificate request.
The tree structure of the type dcr:serviceFeatureListType has the following appearance:
<xs:complexType name="serviceFeatureListType">
<xs:sequence>
<xs:element name="serviceFeature" type="dcr:serviceFeatureType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>