OASIS-WSDL-2-0

WSDL 2.0 W3C Web Services description structure.

Definition

WSDL 2.0 structure: Types (XML Schema definitions), Interface (formerly PortType in 1.1, abstract operations definition), Operation (input/output messages with message reference), Binding (concrete protocol like SOAP HTTP, MIME, HTTP binding REST-ish), Service (endpoint URL). 4 message exchange patterns: in-only, robust in-only, in-out, in-optional-out (vs WSDL 1.1 only RPC + One-way + Request-Response + Notification). HTTP binding improved in WSDL 2.0 (REST support). Adoption: WSDL 2.0 W3C Recommendation 2007 but industry continues largely WSDL 1.1 (legacy investment, .NET WCF default WSDL 1.1, Apache CXF, Apache Axis2). Tools: XSLT transformations WSDL 1.1 <-> 2.0 available. Today REST API + OpenAPI 3.0 + GraphQL have supplanted WSDL for modern APIs ; WSDL maintained legacy SOAP enterprise SOA. WSDL 2.0 Working Group W3C closed 2007.

Origin

WSDL 1.0 IBM Microsoft Ariba release 2000 ; WSDL 1.1 W3C Note 2001 ; WSDL 2.0 Working Group W3C 2004 ; WSDL 2.0 W3C Recommendation 26 June 2007 ; WG closed 2007 ; usage REST/OpenAPI/GraphQL preferred 2020+.

Example in context

SAP NetWeaver Process Integration (legacy SOA platform) uses WSDL 1.1 dominant for SOAP Web Service interfaces between SAP modules + partner systems ; some WSDL 2.0 cases generated by tools but rare in production.

Related terms

• OASIS AMQP — modern alternative.