W3C defines Web Services Description Language (WSDL) as an XML-based language that describes a Web service, including the data exchanged, the protocol to use and its location on the Web. WSDL 1.2 Bindings is a description about use of WSDL 1.2 with Soap 1.2, HTTP and Multipurpose Internet Mail Extension (MIME).
WSDL, along with Soap, XML and Universal Description, Discovery, and Integration (UDDI), form the core set of protocols on which industry giants have more or less agreed, and Web services are being constructed.
According to W3C, WSDL 1.2 is easier and more flexible for developers than the previous version. The latest iteration of WSDL includes better component definition, language clarifications, a conceptual framework that defines description components and support of the XML Schemas and XML Information Set standards. Furthermore, 1.2 removes non-interoperable features from WSDL 1.1 and more effectively works with HTTP and Soap.
These public working drafts are the first in the series of WSDL 1.2 drafts, according to the W3C, and the Web development community will review and comment on these before finalisation.
Looking towards the future, the W3C plans to include in WSDL mapping to Semantic Web Foundations and Outside Co-ordination, although no definitive timeframe was given.