docs/org.eclipse.jst.ws.doc.user/concepts/cws.html - webservices/webtools.webservices - Git at Google

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 <title>Web services overview</title>
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 <body id="cws"><a name="cws"><!-- --></a>

 <h1 class="topictitle1">Web services overview</h1>
 <div><p>A Web service is a set of related application functions that can
 be programmatically invoked over the Internet. Businesses can dynamically
 mix and match Web services to perform complex transactions with minimal programming.
 Web services allow buyers and sellers all over the world to discover each
 other, connect dynamically, and execute transactions in real time with minimal
 human interaction.</p>
 <p>Web services are self-contained, self-describing modular applications that
 can be published, located, and invoked across the Web.</p>
 <blockquote> <p> <span class="uicontrol">Web services are self-contained.</span>  On
 the client side, no additional software is required.  A programming language
 with XML and HTTP client support is enough to get you started.  On the
 server side, a Web server and servlet engine are required.  The client
 and server can be implemented in different environments.  It is possible
 to Web service enable an existing application without writing a single line
 of code.</p>
  <p> <span class="uicontrol">Web services are self-describing.</span>
 The client and server need to recognize only the format and content of request
 and response messages.  The definition of the message format travels
 with the message; no external metadata repositories or code generation tools
 are required.</p>
  <p> <span class="uicontrol">Web services are modular.</span>
 Simple Web services can be aggregated to form more complex Web services either
 by using workflow techniques or by calling lower layer Web services from a
 Web service implementation.</p>
 <p><span class="uicontrol">Web Services are platform independent.</span> Web
 services are based on a concise set of open, XML-based standards designed
 to promote interoperability between a Web service and clients across a variety
 of computing platforms and programming languages.</p>
  </blockquote>
 <p>Web services might be anything, for example, theatre review articles, weather
 reports, credit checks, stock quotations, travel advisories, or airline travel
 reservation processes. Each of these self-contained business services is an
 application that can easily integrate with other services, from the same or
 different companies, to create a complete business process. This interoperability
 allows businesses to dynamically publish, discover, and bind a range of Web
 services through the Internet.</p>
 <div class="section"><h4 class="sectiontitle">Categories of Web services</h4><p>Web services can be grouped
 into three categories:</p>
 <blockquote> <p> <span class="uicontrol">Business information.</span> A
 business shares information with consumers or other businesses. In this case,
 the business is using Web services to expand its scope. Examples of business
 informational Web services are news streams, weather reports, or stock quotations.</p>
  <p> <span class="uicontrol">Business
 integration.</span> A business provides transactional, "for fee" services
 to its customers. In this case, the business becomes part of a global network
 of value-added suppliers that can be used to conduct commerce. Examples of
 business integration Web services include bid and auction e-marketplaces,
 reservation systems, and credit checking.</p>
  <p> <span class="uicontrol">Business process
 externalization.</span> A business differentiates itself from its competition
 through the creation of a global value chain. In this case, the business uses
 Web services to dynamically integrate its processes. An example of business
 process externalization Web services is the associations between different
 companies to combine manufacturing, assembly, wholesale distribution, and
 retail sales of a particular product.</p>
  </blockquote>
 </div>
 <div class="section"><h4 class="sectiontitle">Service roles and interactions</h4><p>A network component
 in a Web Services architecture can play one or more fundamental roles: service
 provider, service broker, and service client.</p>
 <ul><li>Service providers create and deploy their Web services and can publish
 the availability of their WSDL-described services through a service registry,
 such as a UDDI Business Registry.</li>
 <li>Service brokers register and categorize published services and provide
 search services. For example, UDDI acts as a service broker for WSDL-described
 Web services.</li>
 <li>Service clients use broker services such as the UDDI Business Registry
 to discover a needed WSDL-described service and then bind to and call the
 service provider.</li>
 </ul>
 <p>Binding involves establishing all environmental prerequisites that
 are necessary to successfully complete the services. Examples of environmental
 prerequisites include security, transaction monitoring, and HTTP availability.
 The relationships between these roles are described in Figure 1.</p>
 <p>Figure
 1. Service roles and interactions.</p>
 <p> <img src="../images/roles.gif" alt="Figure 1 illustrates the interactions between the service broker, service provider, and service requestor." /> </p>
 </div>

 <p>For more information on Web services, refer to  <a href="http://www.ibm.com/developerworks/webservices" target="_blank">www.ibm.com/developerworks/webservices</a></p>

 </div>
 <div>
 <div class="linklist"><strong>Related Concepts</strong><br />

 <div><a href="cwsinwsa.html">Tools for Web services development</a></div>
 <div><a href="cwsiover.html" title="WS-I is an organization designed to promote Web service interoperability across platforms, operating systems, and programming languages.">Web services
 interoperability (WS-I)</a></div></div>

 <div class="linklist"><strong>Related Tasks</strong><br />

 <div><a href="../tasks/toverws.html" title="Use Web services tools to discover, create, and publish Web services that are created from Java beans, DADX files, enterprise beans, WSDL files, and URLs. The Rational Developer products support the creation of Web services using a top-down approach (which starts with a WSDL file) or a bottom-up approach (which starts with a Java bean or EJB)."> Developing Web
 services</a></div></div>
 </div>
 </body>
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	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE html
	PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html lang="en-us" xml:lang="en-us">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<!-- /*******************************************************************************
	* Copyright (c) 2000, 2005 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/ -->
	<link rel="stylesheet" type="text/css" href="../../org.eclipse.wst.doc.user/common.css" />
	<title>Web services overview</title>
	</head>
	<body id="cws"><a name="cws"><!-- --></a>

	<h1 class="topictitle1">Web services overview</h1>
	<div><p>A Web service is a set of related application functions that can
	be programmatically invoked over the Internet. Businesses can dynamically
	mix and match Web services to perform complex transactions with minimal programming.
	Web services allow buyers and sellers all over the world to discover each
	other, connect dynamically, and execute transactions in real time with minimal
	human interaction.</p>
	<p>Web services are self-contained, self-describing modular applications that
	can be published, located, and invoked across the Web.</p>
	<blockquote> <p> <span class="uicontrol">Web services are self-contained.</span> On
	the client side, no additional software is required. A programming language
	with XML and HTTP client support is enough to get you started. On the
	server side, a Web server and servlet engine are required. The client
	and server can be implemented in different environments. It is possible
	to Web service enable an existing application without writing a single line
	of code.</p>
	<p> <span class="uicontrol">Web services are self-describing.</span>
	The client and server need to recognize only the format and content of request
	and response messages. The definition of the message format travels
	with the message; no external metadata repositories or code generation tools
	are required.</p>
	<p> <span class="uicontrol">Web services are modular.</span>
	Simple Web services can be aggregated to form more complex Web services either
	by using workflow techniques or by calling lower layer Web services from a
	Web service implementation.</p>
	<p><span class="uicontrol">Web Services are platform independent.</span> Web
	services are based on a concise set of open, XML-based standards designed
	to promote interoperability between a Web service and clients across a variety
	of computing platforms and programming languages.</p>
	</blockquote>
	<p>Web services might be anything, for example, theatre review articles, weather
	reports, credit checks, stock quotations, travel advisories, or airline travel
	reservation processes. Each of these self-contained business services is an
	application that can easily integrate with other services, from the same or
	different companies, to create a complete business process. This interoperability
	allows businesses to dynamically publish, discover, and bind a range of Web
	services through the Internet.</p>
	<div class="section"><h4 class="sectiontitle">Categories of Web services</h4><p>Web services can be grouped
	into three categories:</p>
	<blockquote> <p> <span class="uicontrol">Business information.</span> A
	business shares information with consumers or other businesses. In this case,
	the business is using Web services to expand its scope. Examples of business
	informational Web services are news streams, weather reports, or stock quotations.</p>
	<p> <span class="uicontrol">Business
	integration.</span> A business provides transactional, "for fee" services
	to its customers. In this case, the business becomes part of a global network
	of value-added suppliers that can be used to conduct commerce. Examples of
	business integration Web services include bid and auction e-marketplaces,
	reservation systems, and credit checking.</p>
	<p> <span class="uicontrol">Business process
	externalization.</span> A business differentiates itself from its competition
	through the creation of a global value chain. In this case, the business uses
	Web services to dynamically integrate its processes. An example of business
	process externalization Web services is the associations between different
	companies to combine manufacturing, assembly, wholesale distribution, and
	retail sales of a particular product.</p>
	</blockquote>
	</div>
	<div class="section"><h4 class="sectiontitle">Service roles and interactions</h4><p>A network component
	in a Web Services architecture can play one or more fundamental roles: service
	provider, service broker, and service client.</p>
	<ul><li>Service providers create and deploy their Web services and can publish
	the availability of their WSDL-described services through a service registry,
	such as a UDDI Business Registry.</li>
	<li>Service brokers register and categorize published services and provide
	search services. For example, UDDI acts as a service broker for WSDL-described
	Web services.</li>
	<li>Service clients use broker services such as the UDDI Business Registry
	to discover a needed WSDL-described service and then bind to and call the
	service provider.</li>
	</ul>
	<p>Binding involves establishing all environmental prerequisites that
	are necessary to successfully complete the services. Examples of environmental
	prerequisites include security, transaction monitoring, and HTTP availability.
	The relationships between these roles are described in Figure 1.</p>
	<p>Figure
	1. Service roles and interactions.</p>
	<p> <img src="../images/roles.gif" alt="Figure 1 illustrates the interactions between the service broker, service provider, and service requestor." /> </p>
	</div>

	<p>For more information on Web services, refer to <a href="http://www.ibm.com/developerworks/webservices" target="_blank">www.ibm.com/developerworks/webservices</a></p>

	</div>
	<div>
	<div class="linklist"><strong>Related Concepts</strong><br />

	<div><a href="cwsinwsa.html">Tools for Web services development</a></div>
	<div><a href="cwsiover.html" title="WS-I is an organization designed to promote Web service interoperability across platforms, operating systems, and programming languages.">Web services
	interoperability (WS-I)</a></div></div>

	<div class="linklist"><strong>Related Tasks</strong><br />

	<div><a href="../tasks/toverws.html" title="Use Web services tools to discover, create, and publish Web services that are created from Java beans, DADX files, enterprise beans, WSDL files, and URLs. The Rational Developer products support the creation of Web services using a top-down approach (which starts with a WSDL file) or a bottom-up approach (which starts with a Java bean or EJB)."> Developing Web
	services</a></div></div>
	</div>
	</body>
	</html>