Acronym for Simple Object Access Protocol.
A way for a computer program to call a function on a website. The usual SOAP example is quering a web server at IBM which returns (delayed) stock quotes.
This Wiki has a SOAP source letting you grab the wiki source of a webpage.
the WSDL file describing this source is 
http://www.wlug.org.nz/phpwiki/soap.wsdl, a webbrowser friendly URL is http://www.xmethods.net/ve2/WSDLAnalyzer.po;?wsdlurl=http%3A%2F%2Fwww.wlug.org.nz%2Fphpwiki%2Fsoap.wsdl
9 pages link to SOAP:
