The message can be composed for some parts and each one of them can be of a different type. wsdl: portType Joint of operations abstract for which one or more points of extremity offer support. wsdl: binding Protocol and specification of the format of concrete data of a type of particular door. wsdl: service Collection of related points of extremity. This is projected to also invoke remote applications through RPC (Remote Procedure Calls or Chamada de Remote Procedimento) or exchanges of messages in an independent environment of platform and programming language. SOAP guarantees the interoperabilidade and intercommunication between different systems, through the use of the language (XML) and mechanisms of transport standards (HTTP Hypertext Transfer Protocol or Protocolo de Transferncia de Hipertexto), of this form protocol SOAP if is become standard for the exchange of messages between application and Web Services. Erl (2005) defines SOAP as. Although to have been initially conceived as the technology to transpose the breach between platforms based on dog RPC communicates, SOAP if became in one of the most known formats of messages and protocol used for web services based on XML. For this reason, acronym SOAP is related freqentemen you as Service-Oriented Architecture (or Application) Protocol (protocol of guided architecture the services) instead of Simple Object Access Protocol. Generally serving serving SOAP are implemented using HTTP, even so this are not a restriction for its functioning, messages SOAP are in the truth documents XML, that adhere to a specification supplied for agency W3C the Figure below show the project of the structure of a message SOAP. Available source in The three basic parts in the structure of a message SOAP: Envelope: what defines what it is in the message and as to process it, a style of codification (encoding style) to express instance of the type of data defined in the application, and a convention to represent called procedures and answers.? Header: It is an optional heading.