This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
"wsdl" is an XML namespace prefix. In your first example the WSDL namespace http://schemas.xmlsoap.org/wsdl/ is the default namespace In your second example the WSDL namespace http://schemas.xmlsoap.org/wsdl/ is assigned the wsdl namespace prefix. Your particular examples aren't complete enough to show the significant difference.