Leolion7, you may be interested in this Simple Object Access Protocol (SOAP) Tutorial from our sister site, SearchSOA.com. I’ve pasted the opening paragraph below to give you an idea of what’s covered.
Quote: “SOAP has gained status as a common messaging protocol in Web services and SOA projects. This SOAP tutorial provides insight as to what SOAP standard is and when to use it. SOAP basics, how it compares to REST, SOAP attachments and how SOAP functions with WSDL will be covered.”