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Web service Is a applications that can expose an API that can be accessed through the web. This means you can call the application via the web, and the applications that call is called a client. This is possible because the standard web service to allow clients and servers communicate via HTTP with the platform or programming language that is different.

Web Services Platform specification requires a minimum feature to be able to build applications are. Platforms have any exact format of a representation of data and system data type. To be able to interact, the Web Services Platform should provide a standard system of the type of data system to bridge differences in the type of data that exist in various platforms, programming languages and the different components of modeling different. Web Service Platform must also provide information about the description of the interface, functions, and parameters for the needs of the client in the service call. Finally, the Web Service must also provide a mechanism for calling the web service in the remote, this protocol must be independent of platforms and programming languages.

Technology that makes Web Service Platform is realized between the XML (Extensible Markup Language) and XSD (Xml Schema Definition Language) format that provides the basis for the representation of data. And SOAP (Simple Object Acess Protocol), which provides a standard mechanism for the Remote Procedure Call calling Web Services. Then also WSDL (Web Services Description Language) is a grammar to explain the functions and parameters of the web service in XML format. WSDL as one of the supporting technology interoperability Specifically we will discuss how to create a WSDL that supports the interoperability of an application. WSDL (Web Services Description Language) is an XML grammar to describe the web service interface, the protocol be the web service and location. WSDL Version 1.1 specifications made by IBM and Microsoft Research. Although not a WSDL or the W3C standards that must make the call and a web service, but supported the implementation of the various SOAP client and development tools.

Web Service fully web-based standards and xml. Web Service can help:
• The integration of the platform along the virtual machine execution.
• Integration between the Web and OO middleware.
• Integration isolated from the flow of work and sevice-service (Web Services Flow Language - WSFL).
• Exchange of data on the application of different (X-Schema, XSLT)
• (future: the standardization of information between the context of web services and client - horizontal integration services).
• Cast and standards
Microsoft:. NET SUN: Open Net Environment (ONE) IBM: Web Service Conceptual Architecture (WSCA) W3C: Web Service Workshop Oracle: Web Service Broker Hewlett-Packard: Web Service Platform
• The ability of the application, function or operation of the exposure to other programs through the open standard, and interoperable.
• "payloads" is defined as XML.
• "transports" via http or other open Internet protocol.
• Data is accessed from a variety of programming languages, hardware platform or operating system.
• Middleware from the Internet.

XML documents form the plaintext files using standard ISO 8859-1 or using unicode UTF-8 and UTF-16. Symbol markup described by the symbol angle brackets . <...> And called tags. Data, or content, fill the space between the tags was. Tag is used as a sign to navigate the document. Anatomy of an XML document consists of two main parts, namely prologue and elements of the document or the root element.

The Prologue

Consists of the XML declaration and comments.
Declaration

Starting with

Version "1.0" indicates that the XML file written according to the rules XML version 1.0. Encoding = "UTF-8" indicates that the XML file with code written UTF-8. Stand = "yes" means that the XML file stand alone or not there are other supporting files.

Profits can use the XML mentioned as follows.
o simplification of the application, where a database written in XML can be accessed anywhere and facilitate the application in the data because it can save memory.
o Separate data with the presentation, where the tags in XML documents can be

explain the contents of the data and defines the contents of the data. For instance, the XML data indebted , the explanation that a name is tact.
Unlike with HTML, which is used to display data, XML is not designed to display the data. XML is designed to store and exchange data. With XML data can be exchanged between the format of the system that are not compatible. Conversion of data to XML can reduce the complexity and make the data can be read by applications that bebeda carriers.

In the XML file format (plaintext) can be used to share data, making it easier to create different data applications that work with it, also allows for system upgrades to the operating system, server and application of the new.

XML can be used to store data in a file or database. Applications can be made to store and call information from file storage to display the data.
XML, independent of hardware, software and applications, can cause the application to access the XML file as a data source, such as access to the database. The data can be used for almost all types of machine data readers.

XML is a language Markup Language, which is
XML is currently an important role for some of the information transaction conducted through the Internet, because the XML format has become a structure of the exchange of data between the web service on the internet. Growth is not clear from the many advantages of the XML format, among others:
XML allows a transaction to run in connectionless oriented, transaction means the perpetrator does not need to build a special connection that is connected in real time.

XML, short for Extensible Markup Language, is a markup language designed for the delivery of information via the website and can also be used to exchange information between the database system. Markup language (markup language) is a programming language to mark a record. Examples of the markup language that is known is the hypertext markup language (HTML) used to create web pages.
XML provides a format to describe structured data or Terurut. Facilities provided to create XML content (content) data into a more easily understood. XML data format, can be treated with various data-processing tools vary, and for the purpose different. For instance, a program that is used to display the data, while the other program to edit the data.