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The new role of XML in cloud data integration
Learn how to leverage XML Web services to integrate cloud data with enterprise
applications, and build a sample application using the Salesforce Web Services API
with the Java API for XML Web Services (JAX-WS).
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Articles |
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30 Jun 2009 |
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Create a Java applet to download information in remote Web services
Start with a Java applet and build a server-based
proxy system that uses your browser to access an arbitrary Web service. You'll use
JavaScript code to access applet-based information and call a servlet, which retrieves
the remote information. Thus, you bypass the same-server restrictions on what an
applet can and cannot do.
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Articles |
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04 Sep 2008 |
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Ten XML Schemas you should know
In this article, look at some top XML schemas that provide solutions for all sorts of problems, from the basics of Web services to data description. You'll also cover database-like solutions that involve contacts and invoices. The schemas in this article were chosen for their usefulness and utility, plus their impact on the XML community in how information is shared and exchanged using the XML format.
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01 Jul 2008 |
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Services-based enterprise integration patterns made easy, Part 3: Web services and registry
Part 1 and Part 2 of this series covered the basic concepts necessary to
develop services-based integration patterns. This article, the third in the series,
and the upcoming Part 4 further develop these ideas so the services-based
integration patterns become full-blown services-based patterns. This article in
particular deals with the components that are together commonly referred to as Web
services, which were originally designed for services that can be accessed over the
Internet. You'll also see that many of the Web services components can be used with
services that don't use the Internet and that only require a network connection.
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14 Apr 2008 |
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Define, configure, and process topics for notification producers
WS-Notification (WSN) is an OASIS standard that describes, among other things, a
system for categorizing the types of notifications that are emitted from a manageable
resource. By grouping notifications into categories, the designer of a resource's Web
service interface makes it much easier for clients to find the data they need while
ignoring data that is irrelevant. The Apache Muse project contains an implementation of
WS-Notification, including all of the topic data structures and processing logic described
in the specification. This article reviews how to define and configure topics for your notification producers, as well as how to process topic-based notifications in your notification consumers.
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29 May 2007 |
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Optimal message processing with WS-Notification filters
WS-Notification (WSN) is an OASIS standard that describes a system for subscribing to and receiving notifications from a manageable resource; these notifications may reference changes in state, fatal errors, status updates, and more. The standard also describes a way of filtering notifications so that clients can specify a subset of a resource's notifications that they are truly interested in. The Apache Muse project contains an implementation of WS-Notification that includes all of the filtering options. This article reviews all of the different filtering options, the positives and negatives of each, and shows you how you can leverage them in your Muse-based Web service endpoints.
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08 May 2007 |
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Enforce resource property semantics with metadata
The WS-ResourceProperties specification defines a standard for declaring strongly-typed properties as part of a Web service interface, but it does not say anything about permissions, validation, and other important topics. Fortunately, the WS-ResourceFramework authors have provided a new specification, WS-ResourceMetadata, that can help you deal with these issues in a standard way. The Apache Muse project provides implementations of both of these specs and lets you associate metadata with your resource properties with just a small XML file. This article describes how to use metadata to secure and validate your properties and how to test different metadata settings.
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24 Apr 2007 |
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Muse and WEF eases event reporting
The Web Services Distributed Management (WSDM) Event Format (WEF) is an OASIS standard that describes how to serialize events related to systems management in XML. The standard goes into detail about required values, optional values, and the semantics of both, but it offers no instruction for actually implementing the system. Fortunately, the Apache Muse project has an implementation of WEF that lets you create, send, and receive WEF events using a simple Java API. This article shows you how to handle these tasks from within an Apache Muse application.
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03 Apr 2007 |
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Meet the specs: WS-RT 1.0 operations, Part 3
Meet the WS-ResourceTransfer 1.0 initial draft specification, a proposed
open standard that extends certain operations by allowing fragments of XML code in a
single resource to be addressed instead of having to affect the entire resource. This
article provides a closer look at how the WS-ResourceTransfer 1.0 specification handles faults.
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Articles |
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06 Mar 2007 |
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Meet the specs: WS-RT 1.0 operations, Part 2
Meet the WS-ResourceTransfer 1.0 initial draft specification, a proposed open standard that extends certain operations by allowing fragments of XML code in a single resource to be addressed instead of having to affect the entire resource. This article provides a closer look at how the WS-ResourceTransfer 1.0 specification extends the Create operation.
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Articles |
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06 Feb 2007 |
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Meet the specs: WS-RT 1.0 operations, Part One
Meet the WS-ResourceTransfer 1.0 initial draft specification, a proposed open standard that extends certain operations by allowing fragments of XML code in a single resource to be addressed instead of having to affect the entire resource. This article provides a closer look at how the WS-ResourceTransfer 1.0 specification extends the Get operation.
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29 Nov 2006 |
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XML Schema considerations for WSDL design in conformation with WS-I Basic Profile
A valid XML schema is not necessarily valid in a WSDL definition. Learn how design decisions in XML schema definition (XSD) can have significant impact on Web service design. We've included some sample XSDs and WSDLs and we'll briefly discuss them.
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24 Oct 2006 |
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Meet the specs: Intro to WS-ResourceTransfer 1.0
Meet the WS-ResourceTransfer 1.0 initial draft specification (WS-RT), a proposed open standard that extends certain operations by allowing fragments of XML code in a single resource to be addressed instead of having to affect the entire resource. This introduction provides an overview of the specification, examines its heritage, and starts climbing the learning curve by uncovering the definition of fragments and discovering the three expression dialects employed in WS-RT.
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19 Sep 2006 |
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XML in Firefox 1.5, Part 1: Overview of XML features
The open source Firefox Web browser continues to grow in popularity. Users like the security and convenience features it offers. Developers like the Firefox attention to standards compliance, inherited from its Mozilla roots. The most recent version, Firefox 1.5, comes with many features for XML developers, including XML parsing, XHTML, CSS, XSLT, SVG, XML Events in JavaScript, and XForms. Additional third-party extensions provide even more XML support. In this article, Uche Ogbuji provides an overview of XML features in Firefox 1.5.
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21 Mar 2006 |
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Processing WSDL documents with XSLT
Explore a variety of methods that can be used to express WSDL documents with XSLT. The author outlines approaches and discusses the benefits and challenges of working with this powerful XML-based tool.
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14 Feb 2006 |
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Tip: xsd:any: A cautionary tale
xsd:any is a popular feature for people designing XML schema. But it's often more trouble than it's worth. Explore some of the shortcomings of xsd:any, both in XML itself and in the JAX-RPC Java language binding, so that, even if you decide to use xsd:any, you will be more prepared to deal appropriately with it.
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13 Dec 2005 |
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Develop apps with Web services and the eBay SDK, Part 3: Develop eBay applications with PHP5 and Web services
Create applications in PHP5 that interact with eBay through Web services. Almost half of eBay's transactions occur through its Web services platform. In this tutorial, you'll acquire a solid understanding of the mechanics of the eBay XML API and learn how to use the Services_Ebay PHP extension.
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Tutorials |
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08 Nov 2005 |
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Model-driven XML forms generation, Part 2: Generate forms targeting Web services
Take a closer look at XML Forms Generator. Part 1 of this two-part series showed you how this alphaWorks technology uses Model Driven Development concepts with Eclipse Modeling Framework (EMF) to permit generation of forms from XML instance data. Here in Part 2, the authors show you how XML Forms Generator can generate forms from Web Services Description Language (WSDL) documents.
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25 Aug 2005 |
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Model-driven XML forms generation, Part 1: Start using the XML Forms Generator
Find out how the XML Forms Generator utilizes Model Driven Development concepts with the Eclipse Modeling Framework to permit generation of forms from XML instance data. The XML Forms Generator, which is available from IBM alphaWorks, is a standards-based, model-driven tool that enables the immediate generation of working forms. Part 2 of the series will demonstrate how this solution also provides for the generation of forms from Web Services Description Language (WSDL) documents.
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19 Aug 2005 |
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Web services choreography in practice
Find out how you can use the Web Service Choreography Interface (WSCI) to weave different Web services into meaningful business processes. Jerome Josephraj presents a simple stock trading example that highlights the shortfalls of using Web Services Description Language (WSDL) for business process integration, and how you can utilize Web Service Choreography (WSC) to overcome these shortfalls.
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10 May 2005 |
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Introduction to Web Services for Remote Portlets
Get an introduction to Web Services for Remote Portlets (WSRP), a specification which defines how to leverage SOAP-based Web services that generate mark-up fragments within a portal application. By defining a set of common interfaces, WSRP allows portals to display remotely-running portlets inside their pages without requiring any additional programming by the portal developers. To the end-user, it appears that the portlet is running locally within their portal, but in reality the portlet resides in a remotely-running portlet container, and interaction occurs through the exchange of SOAP messages. Leveraging WSRP within a Service-Oriented Architecture provides a powerful combination whereby presentation-oriented portlet applications can be discovered and reused without engaging in additional development or deployment activities.
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15 Apr 2005 |
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Web services programming tips and tricks: Improve interoperability between J2EE technology and .NET, Part 1
Explore the source of some common interoperability challenges facing Web services integration across platforms and join the author in analyzing a number of interoperability problems resulting from interaction styles, basic data types and structures, and namespace issues between .NET and J2EE technology. Wangming Ye offers best practices that you can use to avoid problems and improve the chances of successful integration. The first part of the series stresses the importance of WSDL design and analyzes the strength and pitfalls of the traditional RPC/encoded style in Web services interoperability.
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21 Dec 2004 |
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Supporting policies in Service-Oriented Architecture
Explore this proposal to extend the Web Services Description Language (WSDL)-based service definition to incorporate support for policy-based endpoints description. This solution is based on combining several emerging standards -- WSDL 2.0, WS-Addressing, and WS-Policy. Additionally the author describes a generic EMF-based approach for creating APIs that support dynamic processing of the proposed WSDL extension.
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Articles |
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30 Nov 2004 |
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Tip: Send multiple Web services requests from XForms
A typical HTML form only lets you submit to one URL at a time, which makes it difficult to retrieve information from multiple Web services. This tip shows you how to use XForms to solve that problem by using multiple submissions from a single form.
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Articles |
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03 Sep 2004 |
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Analyze with XSLT: Tie in data with Web services and XSL Transformations
In Part 5 of this tutorial series on analyzing data with XSLT, the MindMap Research Team decides to tie their data in with other services, pulling information from Amazon Web Services in response to information unearthed in the analysis. Web services provide information in XML, but it's rarely in the form that you want it, so this tutorial explains how to create an application that not only retrieves the Amazon data but also transforms it into XHTML and outputs it to the browser. The stylesheet shows how to pull XML information from multiple sources within a single transformation and also includes a device that alerts developers when Amazon changes the Web service, since changes in the feed can break the application.
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Tutorials |
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17 Aug 2004 |
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Tip: Send part of an XForms instance to a Web service
An XForms form is handy as a Web service client because it enables you to easily send and receive an XML document, but what if you don't necessarily want to send the entire data instance? This tip explains how you can build an instance that includes a SOAP message along with other data, and then send only the SOAP message on submission.
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Articles |
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13 Aug 2004 |
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Tip: Create an XForms form that submits a second instance
Because they can easily send and receive XML, XForms forms make great Web services clients, but using them in this way limits your control over the structure of your instance. This tip explains how to manage your data within one instance while submitting a second.
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Articles |
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22 Jul 2004 |
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Tip: Use XForms to send and receive Web services messages
One of the great strengths of XForms is the fact that an XForms client can send its data as XML, and that it receives XML in return. This capability can be exceptionally useful in the field of Web services, where that's exactly what gets sent and received: XML messages. In this tip, the author looks at how to use an XForms browser as a Web services client, sending a SOAP request and displaying the results directly in the browser.
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Articles |
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24 Jun 2004 |
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Tip: Use XML to send SMS messages
Many developers tend to think of Web services as a way to easily move information from one place to another, but it's also important to understand how integral a Web service can be to the overall application. This tip gives some examples of using XML for Short Message Service (SMS) messages. If you're familiar with SMS, you'll find out how adding this tool to your toolbox can help you; if you're not an SMS developer, you'll see a real-life example of how Web services are integrated into an application.
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Articles |
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07 Jun 2004 |
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Tip: Use data dictionary links for XML and Web services schemata
When designing XML and Web services schemata you will often (and ideally) reuse data elements defined in pre-existing standards. When you do, it is extremely useful to include links to such standards, providing precise data dictionary references. In so doing, you make processing and maintenance easier to automate. This tip illustrates this practice.
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Articles |
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20 May 2004 |
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Use RDDL with your XML and Web services namespaces
The spaghetti of namespaces in, say, a WSDL file can lead to a lot of confusion. Resource Directory Description Language (RDDL) packages information on a namespace. If you use URLs for namespaces, use RDDL as described in this article to provide useful guides to users of your XML documents or Web services.
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Articles |
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14 May 2004 |
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Tip: Use a proxy network library for SOAP behind a firewall
If you are trying to access a SOAP service from behind a firewall and your SOAP library does not have support for proxying network connections, you may not be able to get through by direct request. In such cases, you can use socket redirection programs to make the connection through a proxy server. Uche Ogbuji shows how to do so in this tip.
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Articles |
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26 Mar 2004 |
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Web services programming tips and tricks: Exception Handling with JAX-RPC
Explicitly declaring faults in WSDL operations, like explicitly declaring exceptions in Java methods, is good programming practice. This tip first examines the exception behavior in the absence of wsdl:fault. It then focuses on how a wsdl:fault is mapped to a checked Java exception and how a JAX-RPC runtime handles this checked exception.
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Articles |
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06 Feb 2004 |
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A survey of XML standards: Part 2
The world of XML is vast and growing, with a huge variety of standards and technologies that interact in complex ways. It can be difficult for beginners to navigate the most important aspects of XML, and for users to keep track of new entries and changes in the space. Uche Ogbuji continues this series on XML standards by focusing on XML processing technologies.
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Articles |
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03 Feb 2004 |
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Tip: Use XInclude to synchronize WSDL with source schemata
In the document/literal style of Web services, the schemas of the interchange formats are often based on an existing document standard. This can cause problems synchronizing WSDL files with the standard schemata. This tip shows how to use XInclude to incorporate external schema fragments into a WSDL file.
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Articles |
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22 Jan 2004 |
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Tip: Use XML directly over HTTP for Web services (where appropriate)
SOAP technologies usually exchange XML over HTTP, but SOAP has its pros and cons, and a lot of discussion has focused on how to use XML more directly to communicate between applications. This tip describes the direct approach, and discusses where it is most appropriate. It also discusses how to use WSDL to describe such services.
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Articles |
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15 Jan 2004 |
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The Python Web services developer: The power of three: Python, Web services, and XSLT
This column has covered the major Python APIs for Web services processing, yet the enthusiasm for Web services development has been notably muted in the Python community compared to that of, say, the Java community. One way to augment the Python features for Web services processing is to take advantage of the most popular specialized language for XML processing: XSLT. Python offers several good tools for XSLT processing, and you can tap into this mine to enhance Web services processing capabilities. This article will show you how. You should be familiar with XSLT in order to follow the examples.
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Articles |
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24 Jun 2003 |
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The Web services (r)evolution: Part 1
This opening article of our new column focuses on the benefits and challenges of building Web service applications. Web services may be an evolutionary step in designing distributed applications, however, they are not without their problems. Graham outlines the difficulties developers face in creating a truly workable distributed system of Web services. This article also outlines his plan for building peer-to-peer Web applications over the coming issues of this column.
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Articles |
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01 Nov 2000 |
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