<schema targetNamespace="http://www.bea.com/wli/sb/context"
        xmlns:mc="http://www.bea.com/wli/sb/context"
        xmlns="http://www.w3.org/2001/XMLSchema"
        elementFormDefault="qualified"
        attributeFormDefault="unqualified">
    <!--============================================================== -->

    <!-- The context variable 'fault' is an instance of this element -->
    <element name="fault" type="mc:FaultType"/>

    <!-- The context variables 'inbound' and 'outbound' are instances of this element -->
    <element name="endpoint" type="mc:EndpointType"/>

    <!-- The three sub-elements within the 'inbound' and 'outbound' variables -->
    <element name="service" type="mc:ServiceType"/>
    <element name="transport" type="mc:TransportType"/>
    <element name="security" type="mc:SecurityType"/>

    <!-- The context variable 'attachments' is an instance of this element -->
    <element name="attachments" type="mc:AttachmentsType"/>

    <!-- Each attachment in the 'attachments' variable is represented by an instance of this element -->
    <element name="attachment" type="mc:AttachmentType"/>

    <!-- Element used to represent binary payloads and pass-by reference content -->
    <element name="binary-content" type="mc:BinaryContentType"/>

    <!-- =================================================================== -->

    <!-- The schema type for  -->
    <complexType name="AttachmentsType">
        <sequence>
            <!-- the 'attachments' variable is just a series of attachment elements -->
            <element ref="mc:attachment" minOccurs="0" maxOccurs="unbounded"/>
        </sequence>
    </complexType>
    
    <complexType name="AttachmentType">
        <all>
            <!-- Set of MIME headers associated with attachment -->
            <element name="Content-ID" type="string" minOccurs="0"/>
            <element name="Content-Type" type="string" minOccurs="0"/>
            <element name="Content-Transfer-Encoding" type="string" minOccurs="0"/>
            <element name="Content-Description" type="string" minOccurs="0"/>
            <element name="Content-Location" type="string" minOccurs="0"/>
            <element name="Content-Disposition" type="string" minOccurs="0"/>

            <!-- Contains the attachment content itself, either in-lined or as <binary-content/> -->
            <element name="body" type="anyType"/>
        </all>
    </complexType>

    <complexType name="BinaryContentType">
        <!-- URI reference to the binary or pass-by-reference payload -->
        <attribute name="ref" type="anyURI" use="required"/>
    </complexType>

    <!-- =================================================================== -->

    <complexType name="EndpointType">
        <all>
            <!-- Sub-elements holding service, transport, and security details for the endpoint -->
            <element ref="mc:service" minOccurs="0" />
            <element ref="mc:transport" minOccurs="0" />
            <element ref="mc:security" minOccurs="0" />
        </all>

        <!-- Fully-qualified name of the service represented by this endpoint -->
        <attribute name="name" type="string" use="required"/>
    </complexType>

    <!-- =================================================================== -->

    <complexType name="ServiceType">
        <all>
            <!-- name of service provider -->
            <element name="providerName" type="string" minOccurs="0"/>

            <!-- the service operation being invoked -->
            <element name="operation" type="string" minOccurs="0"/>
        </all>
    </complexType>

    <!-- =================================================================== -->

    <complexType name="TransportType">
        <all>
            <!-- URI of endpoint -->
            <element name="uri" type="anyURI" minOccurs="0" />

            <!-- Transport-specific metadata for request and response (includes transport headers) -->
            <element name="request" type="anyType" minOccurs="0"/>
            <element name="response" type="anyType" minOccurs="0" />

            <!-- Indicates one-way (request only) or bi-directional (request/response) communication -->
            <element name="mode" type="mc:ModeType" minOccurs="0" />

            <!-- Specifies the quality of service -->
            <element name="qualityOfService" type="mc:QoSType" minOccurs="0" />

            <!-- Retry values (outbound only) -->
            <element name="retryInterval" type="integer" minOccurs="0" />
            <element name="retryCount" type="integer" minOccurs="0" />
        </all>
    </complexType>

    <simpleType name="ModeType">
        <restriction base="string">
            <enumeration value="request"/>
            <enumeration value="request-response"/>
        </restriction>
    </simpleType>

    <simpleType name="QoSType">
        <restriction base="string">
            <enumeration value="best-effort"/>
            <enumeration value="exactly-once"/>
        </restriction>
    </simpleType>

    <!-- =================================================================== -->

    <complexType name="SecurityType">
        <all>
            <!-- Transport-level client information (inbound only) -->
            <element name="transportClient" type="mc:SubjectType" minOccurs="0"/>

            <!-- Message-level client information (inbound only) -->
            <element name="messageLevelClient" type="mc:SubjectType" minOccurs="0"/>
            
            <!-- Boolean flag used to disable outbound WSS processing (outbound only) -->
            <element name="doOutboundWss" type="boolean" minOccurs="0"/>
        </all>
    </complexType>

    <complexType name="SubjectType">
        <all>
            <!-- User name associated with this tranport- or message-level subject -->
            <element name="username" type="string"/>
        </all>
    </complexType>

    <!-- =================================================================== -->

    <complexType name="FaultType">
        <all>
            <!-- A short string identifying the error (e.g. BEA38229) -->
            <element name="errorCode" type="string"/>

            <!-- Descriptive text explaining the reason for the error -->
            <element name="reason" type="string" minOccurs="0" />

            <!-- Any additional details about the error  -->
            <element name="details" type="anyType" minOccurs="0" />

            <!-- Information about where the error occured in the proxy -->
            <element name="location" type="mc:LocationType" minOccurs="0" />
        </all>
    </complexType>

    <complexType name="LocationType">
        <all>
            <!-- Name of the Pipeline/Branch/Route node where error occured -->
            <element name="node" type="string" minOccurs="0" />

            <!-- Name of the Pipeline where error occured (if applicable) -->
            <element name="pipeline" type="string" minOccurs="0" />

            <!-- Name of the Stage where error occured (if applicable) -->
            <element name="stage" type="string" minOccurs="0" />

            <!-- Indicates if error occured from inside an error handler -->
            <element name="error-handler" type="boolean" minOccurs="0" />
        </all>
    </complexType>
    <!-- Encapsulates any stack-traces that may be added to a fault <details> -->
    <element name="stack-trace" type="string"/>
</schema>