The specification was submitted by Microsoft, IBM and other co-sponsors to the W3C last year. Microsoft released a first version of the toolkit for use with Visual Studio last summer. Since then, it says there have been hundreds of thousands of downloads of the toolkit.
The software giant has also released a free plug-in for its Internet Explorer Browser that allows developers to use Web services from scripts.
The releases continue Microsoft's efforts to promote its .Net strategy, in which the line between proprietory services and software becomes less distinct. The .Net approach encourages developers to build in standard links to Microsoft-backed web services, such as those offered by its bCentral portal for SMEs.