[GRAAP-WG] Extension of agreement states for WS-Agreement-Negotiation

26 Sep 2008

      Dear all,

After the discussion in the GRAAP group concerning the extension of the
AgreementState port type for the negotiation protocol, it turned out that
this is not necessary. It is still possible to define substates for the
states defined in the WS-Agreement recommendation. The important
structures for this are listed below:

    <xs:simpleType name="AgreementStateDefinition">
        <xs:restriction base="xs:string">
            <xs:enumeration value="Pending"/>
            <xs:enumeration value="PendingAndTerminating"/>
            <xs:enumeration value="Observed"/>
            <xs:enumeration value="ObservedAndTerminating"/>
            <xs:enumeration value="Rejected"/>
            <xs:enumeration value="Complete"/>
            <xs:enumeration value="Terminated"/>
        </xs:restriction>
    </xs:simpleType>

AgreementStateDefinition defines the WS-Agreement states as an
enumeration.

    <xs:complexType name="AgreementStateType">
      <xs:complexContent>
        <xs:extension base="wsag:InnerAgreementStateType">
          <xs:sequence>
            <xs:element name="State"
type="wsag:AgreementStateDefinition"/>
          </xs:sequence>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="InnerAgreementStateType">
        <xs:sequence>
            <xs:any minOccurs="0" namespace="##other"
processContents="lax"/>
        </xs:sequence>
    </xs:complexType>

The AgreementStateType defines one element State that can take a value
defined in AgreementStateDefinition. AgreementStateType also extends
InnerAgreementStateType, which allows extending AgreementStateType with an
abritary XML document. Therefore, it is possible to add a document in the
WS-Agreement-Negotiation namespace, which defines e.g. a substate for an
AgreementState.

How these extensions (e.g. substates) are defined, is then part of the
WS-Agreement-Negotiation specification. However, this approach would be a
fully compliant and compatible way to introduce substates in
WS-Agreement-Negotiation with respect to the base WS-Agreement
specification.

Best regards,
Oliver

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                          Oliver Wäldrich
  Fraunhofer-Institute for Algorithms and Scientific Computing (SCAI)
         Schloss Birlinghoven, D-53754 Sankt Augustin, Germany
             Tel: +49 2241 14 2830; Fax: +49 2241 14 42830

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