...number but is not in fact valid," he said. "If you try to use that invalid number on Amazon, it will you that it's a wrongcredit card number." To date, most development has involved text-based screens, but the software could potentially...
http://www.internetnews.com/software/article.php/3829106
This primer is only intended to be a starting point toward use of WSDL 2.0, and hence does not describe every feature of the language. Users are expected to consult the WSDL 2.0 specification if they wish to make use of more sophisticated features or techniques.
http://www.w3.org/TR/2007/PR-wsdl20-primer-20070523