Date: 2004-10-28.
XML Schema for Fair Contract Signing Protocol, defined in the Trusted Mobile Platform Protocol Specification Document (Revision 1.00), pages 75-79. See the news story "Trusted Mobile Platform Specifications Released for Industry Review."
From Section 6 'Fair Contract Signing Protocol': "...Reliable and atomic transaction is one of the key requirements for TMP. In the e-Ticket scenario described in the Phase 0 document, when the user purchases an electronic ticket using a mobile device, the paying event and the ticket receiving event must be atomic and inseparable; either they both occur or neither one occurs. Although this is a general requirement for virtually any network-based transactions, TMP has identified that this is a much more serious problem for mobile devices because wireless network connections are less reliable especially when the clients are moving... This section defines the TMP Fair Contract Signing Protocol, which allows exchanging signatures in an atomic way. The protocol uses the idea of Optimistic Fair Contract Signing recently proposed by Asokan, Shoup, and Waidner..." See literature references
<xsd:schema targetNamespace="http://schemas.trusted-mobile.org/protocol/2006/06/ofcs" xmlns:ofcs="http://schemas.trusted-mobile.org/protocol/2006/06/ofcs" xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/12/secext" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:import namespace="http://schemas.xmlsoap.org/ws/2002/12/secext" schemaLocation="wss.xsd"/> <xsd:element name="Commitment"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:Initiator"/> <xsd:element ref="ofcs:Responder"/> <xsd:element ref="ofcs:Broker"/> <xsd:element ref="ds:Signature" maxOccurs="1"/> </xsd:sequence> <xsd:attribute name="CommitmentID" type="ofcs:IDType" use="required"/> </xsd:complexType> </xsd:element> <xsd:element name="Contract"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:Initiator"/> <xsd:element ref="ofcs:Responder"/> <xsd:element ref="ds:Signature" minOccurs="1" maxOccurs="2"/> </xsd:sequence> <xsd:attribute name="ContractID" type="ofcs:IDType" use="required"/> </xsd:complexType> </xsd:element> <xsd:element name="AbortedContract"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:CommitmentRef"/> <xsd:element ref="ds:Signature"/> </xsd:sequence> <xsd:attribute name="ContractID" type="ofcs:IDType" use="required"/> </xsd:complexType> </xsd:element> <xsd:element name="CommitmentRequest"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:Commitment"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="CommitmentResponse"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:Commitment"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="ContractRequest"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:Contract"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="ContractResponse"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:Contract"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="AbortRequest"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:Commitment"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="AbortResponse"> <xsd:complexType> <xsd:choice> <xsd:sequence> <xsd:element ref="ofcs:Contract"/> </xsd:sequence> <xsd:sequence> <xsd:element ref="ofcs:AbortedContract"/> </xsd:sequence> </xsd:choice> </xsd:complexType> </xsd:element> <xsd:element name="ResolveRequest"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ofcs:Commitment" minOccurs="2" maxOccurs="2"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="ResolveResponse"> <xsd:complexType> <xsd:choice> <xsd:sequence> <xsd:element ref="ofcs:Contract"/> </xsd:sequence> <xsd:sequence> <xsd:element ref="ofcs:AbortedContract"/> </xsd:sequence> </xsd:choice> </xsd:complexType> </xsd:element> <xsd:element name="Initiator"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ds:Reference"/> <xsd:element ref="wsse:SecurityTokenReference"/> <xsd:element ref="ofcs:CommitmentRef" minOccurs="0" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="Responder"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ds:Reference"/> <xsd:element ref="wsse:SecurityTokenReference"/> <xsd:element ref="ofcs:CommitmentRef" minOccurs="0" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="Broker"> <xsd:complexType> <xsd:sequence> <xsd:element ref="wsse:SecurityTokenReference"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="CommitmentRef"> <xsd:complexType> <xsd:attribute name="RefID" type="ofcs:IDReferenceType" use="required"/> </xsd:complexType> </xsd:element> <xsd:simpleType name="IDType"> <xsd:restriction base="xsd:string"/> </xsd:simpleType> <xsd:simpleType name="IDReferenceType"> <xsd:restriction base="xsd:string"/> </xsd:simpleType> </xsd:schema>
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