BPEL Extensions to WSDL

BPEL provides three extensions to WSDL definitions: partner link types, properties, and property aliases. Each extension element is in a BPEL-specific namespace.

• For partner link types:

  • Namespace URI: "http://docs.oasis-open.org/wsbpel/2.0/plnktype"

  • Usual prefix: plink

• For properties and property aliases:

  • Namespace URI: "http://docs.oasis-open.org/wsbpel/2.0/varprop"

  • Usual prefix: vprop

Our examples do not show namespace URIs.

Partner Link Types

A partner link type specifies the roles that are enacted during a runtime conversation between the BPEL process and a partner service. We describe partner link types in Chapter 7.

 <wsdl:definitions name="NCName" targetNamespace="anyURI" ...> <plnk:partnerLinkType name="NCName">        <plnk:role name="NCName" portType="QName" />        <plnk:role name="NCName" portType="QName" />?     </plnk:partnerLinkType> </wsdl:definitions> 

Here's an example.

 <wsdl:definitions name="properties">    <plnk:partnerLinkType name="ProcessQuotePLT">       <plnk:role name="ProcessQuoteRole"                   portType="ProcessQuote" />    </plnk:partnerLinkType>    <plnk:partnerLinkType name="PartnerPLT">       <plnk:role name="partnerRole"                   portType="RiskAnalysis" />    </plnk:partnerLinkType> </wsdl:definitions> 

Property

A property creates a name that refers to an XML Schema type. Creating a property of a given name is a prerequisite to creating a property alias. We describe properties in Chapter 7.

 <wsdl:definitions name="NCName" targetNamespace="anyURI" ...>    <vprop:property name="NCName" type="QName"? element="QName"? /> </wsdl:definitions> 

Here's an example.

 <wsdl:definitions name="properties">    <vprop:property name="quote" type="xsd:string" /> </wsdl:definitions> 

Property Alias

A property alias allows your BPEL process associate a property name with a field in a BPEL variable. We describe property aliases in Chapter 7.

 <wsdl:definitions name="NCName" targetNamespace="anyURI" ...>    <vprop:propertyAlias propertyName="QName"            messageType="QName"?            part="NCName"?            type="QName"?            element="QName"?>        <vprop:query queryLanguage="anyURI"?>?           queryContent        </vprop:query>     </vprop:propertyAlias> </wsdl:definitions> 

Here's an example.

     <wsdl:definitions name="properties">        <vprop:propertyAlias messageType="NewPolicyRequestMsg"                             part="NewPolicyParameters"                             propertyName="tns:quote">           <vprop:query>/quote/quoteID</bpws:query>        </vprop:propertyAlias>        <vprop:propertyAlias messageType="statusRequestMsg"                             part="statusParameters"                             propertyName="tns:quote">           <vprop:query>/quote/quoteID</bpws:query>        </vprop:propertyAlias>     </wsdl:definitions>