The prefix "wsdl" for element "wsdl:definitions" is not bound

the prefix wsdl: indicates a namespace.
The prefix requires a binding to a namespace, in order to have meaning

<wsdl:description...>
does not mean anything

<wsdl:description xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"...>
does mean something since now you now that in this XML document
the wsdl: prefix means that the element is in this namespace "http://schemas.xmlsoap.org/wsdl/"

即要指明“wsdl”的命名空间。


引用： http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/WSDL/Q_24703594.html