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

 <?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 content="text/html; charset=utf-8" http-equiv="Content-Type" />
 <meta name="copyright" content="Copyright (c) 2000, 2007 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" />
 <meta name="DC.rights.owner" content="(C) Copyright 2000, 2007" />
 <meta content="public" name="security" />
 <meta content="index,follow" name="Robots" />
 <meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
 <meta content="concept" name="DC.Type" />
 <meta name="DC.Title" content="Web services overview" />
 <meta name="abstract" content="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." />
 <meta name="description" content="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." />
 <meta content="Web services, overview" name="DC.subject" />
 <meta content="Web services, overview" name="keywords" />
 <meta scheme="URI" name="DC.Relation" content="cwsinwsa.html" />
 <meta scheme="URI" name="DC.Relation" content="cwsstandards.html" />
 <meta scheme="URI" name="DC.Relation" content="../tasks/toverws.html" />
 <meta content="XHTML" name="DC.Format" />
 <meta content="cws" name="DC.Identifier" />
 <meta content="en-us" name="DC.Language" />
 <link href="../../org.eclipse.wst.doc.user/common.css" type="text/css" rel="stylesheet" />
 <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>
 <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>
 <div class="linklist"><strong>Related Concepts</strong><br />

 <div><a href="cwsinwsa.html" title="">Tools for Web services development</a></div>
 <div><a href="cwsstandards.html" title="One of the key attributes of Internet standards is that they focus on protocols and not on implementations. The Internet is composed of heterogeneous technologies that successfully interoperate through shared protocols. This prevents individual vendors from imposing a standard on the Internet. Open Source software development plays a crucial role in preserving the interoperability of vendor implementations of standards.">Web services standards</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, enterprise beans, and WSDL files. You can create 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>
	<?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 content="text/html; charset=utf-8" http-equiv="Content-Type" />
	<meta name="copyright" content="Copyright (c) 2000, 2007 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" />
	<meta name="DC.rights.owner" content="(C) Copyright 2000, 2007" />
	<meta content="public" name="security" />
	<meta content="index,follow" name="Robots" />
	<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
	<meta content="concept" name="DC.Type" />
	<meta name="DC.Title" content="Web services overview" />
	<meta name="abstract" content="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." />
	<meta name="description" content="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." />
	<meta content="Web services, overview" name="DC.subject" />
	<meta content="Web services, overview" name="keywords" />
	<meta scheme="URI" name="DC.Relation" content="cwsinwsa.html" />
	<meta scheme="URI" name="DC.Relation" content="cwsstandards.html" />
	<meta scheme="URI" name="DC.Relation" content="../tasks/toverws.html" />
	<meta content="XHTML" name="DC.Format" />
	<meta content="cws" name="DC.Identifier" />
	<meta content="en-us" name="DC.Language" />
	<link href="../../org.eclipse.wst.doc.user/common.css" type="text/css" rel="stylesheet" />
	<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>
	<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>
	<div class="linklist"><strong>Related Concepts</strong><br />

	<div><a href="cwsinwsa.html" title="">Tools for Web services development</a></div>
	<div><a href="cwsstandards.html" title="One of the key attributes of Internet standards is that they focus on protocols and not on implementations. The Internet is composed of heterogeneous technologies that successfully interoperate through shared protocols. This prevents individual vendors from imposing a standard on the Internet. Open Source software development plays a crucial role in preserving the interoperability of vendor implementations of standards.">Web services standards</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, enterprise beans, and WSDL files. You can create 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>