<element name="SenderNonRepudiation"> <complexType> <sequence> <element name="NonRepudiationProtocol" type="tns:protocol.type" /> <element ref="tns:HashFunction" /> <element ref="tns:SignatureAlgorithm" maxOccurs="unbounded" /> <element name="SigningCertificateRef" type="tns:CertificateRef.type" /> </sequence> </complexType> </element>