Applying xml
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This document discusses XML web services and their components. It defines XML web services as software services exposed on the web through the SOAP protocol and described with WSDL and registered in UDDI. It describes how SOAP is used for communication, WSDL describes service interfaces, and UDDI allows for service discovery. Examples of web services are provided. The architecture of web services is shown involving clients, services, and standards. Finally, it discusses how XML data can be transformed to HTML for display in web pages using XSLT transformation rules.
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Applying xml
- 1. Applying XML
- 2. XML and Web Services • XML web services are basic building blocks in the era of distributed computing • Demand for XML web services: – Open standards focuses on communication and collaboration between people and applications – Web services have become an platform for the application integration – Applications have been developed with multiple XML web services from various sources work together regardless of where these services resides and how these services are implemented.
- 3. Contd.. • XML Web services – Work with standard web protocols like XML, HTTP and TCP/IP – exposes many functionality to the user through the web protocol (SOAP). – provides a means to describe their interfaces, which allows the user to build a client application to interact with them and described in document called WSDL – must be registered so that users can find them and done through UDDI. – allows programs written in different language and in different architecture to communicate with one another in a standard way. • XML web service is defined as the software service exposed on the web through the SOAP protocol and described with a WSDL file and registered in the UDDI
- 4. Contd.. • Examples: – Stock Quotes – Weather Forecasts – Sports Scores – Calendar Service • These services can be accessed freely whereas some might require a subscription to the service • Makes the programmatic access easier and much more reliable. • Exposing existing applications as a web service allows users rapidly to develop new applications based on these web services. – For e.g., a web service for purchasing application is developed where in which this application obtains the price info from a variety of vendors, allowing the user to select a specific vendor, submitting the order and then track the shipment details until it is received – This might in turn use another web service to check the customers credit, manage the customer’s account.
- 5. SOAP (Simple Object Access Protocol) • A communication protocol for Web services. • A specification which defines the XML format for messages. • SOAP message contains the callable function, parameters required to pass the function which is sent from the client and the server returns the message with the results • SOAP tool kits will translate the function calls from some language to a SOAP message. – For example Apache tool kit translates the java function calls in to SOAP messages • SOAP is been implemented on many different hardware and software platforms.
- 6. WSDL (Web Services Description Language) • WSDL file describes the message formats and how these messages are exchanged. • It is based on the XML schema standard which makes the web services interfaces accessible from variety of platforms and programming languages. • It also defines where the services are available, what communication protocol is used.
- 7. UDDI • UDDI stands for Universal Discovery Description and Integration. • It is like the yellow pages for the Web services. • Yellow pages are used to search for the company that offers services we need, read the services offered and contact someone for more info. • UDDI directory includes several ways to search for the services that we need to build our applications. • Web services can be offered without registering it in the UDDI, but UDDI is required for the customers to find you. • For e.g., we can search for providers of a service in a specified geographic location or for business of a specified type. • The UDDI directory will then supply info, contacts, links, and technical data to allow us to evaluate which services meet our requirements.
- 9. HTML with XML • Data in XML can be described by itself. • The question of how data is loaded to the application and displayed to the user is left to the application program. • Normally web application allows user to display the stored data through web browser. • XML data can also be transformed to HTML which can then be viewed in the web page. • The transformation of XML to HTML can be done in two different ways – DOM/SAX parser which helps in loading XML data into html page and formatting it in to a HTML document. – XSLT, which helps in describing the transformation rules from XML to HTML and display it in the web page.
- 10. XSLT • XSLT stands for Extensible Style sheet Language Transformations • XSLT is an XML-related Language which helps in manipulating and transforming XML documents.
- 11. Contd..
- 12. XSLT Document • The root element of the XSL document is <xsl:stylesheet> • To include the XSLT is XML document: <?xml-stylesheet type="text/xsl" href=“filename.xsl"?>