<element name="ReceiverDigitalEnvelope"> <complexType> <sequence> <element name="DigitalEnvelopeProtocol" type="tns:protocol.type" /> <element ref="tns:EncryptionAlgorithm" maxOccurs="unbounded" /> <element name="EncryptionCertificateRef" type="tns:CertificateRef.type" /> </sequence> </complexType> </element>