INTRODUCTORY INFORMATION TECHNOLOGY CREATING WEB-ENABLED APPLICATIONS. Faramarz Hendessi

Transcription

1 INTRODUCTORY INFORMATION TECHNOLOGY CREATING WEB-ENABLED APPLICATIONS Faramarz Hendessi

2 INTRODUCTORY INFORMATION TECHNOLOGY Lecture 11 Fall 2010 Isfahan University of technology Dr. Faramarz Hendessi 2

3 Objectives Describe the three principal forces behind the interest in creating Web-enabled applications in enterprises. Distinguish between the purposes of HTML and XML in Web-enabled applications. Explain how XML aids in creating interenterprise IT applications. 3

4 Objectives (Continued) Identify the six advantages of XML. Explain the potential benefit of Web services to enterprises IT applications. Identify and describe the three tools that facilitate the user of Web services. 4

5 Forces Behind Web-Enabled Systems Definition Web-enablement:The tendency of systems developers to incorporate features of the Internet in enterprise systems. 5

6 Forces Behind Web-Enabled Systems Widespread Use of Browsers New computers shipped with Web browsers Large installed base of browser users Browsers appearing on other IT devices Intuitive features 6

7 Forces Behind Web-Enabled Systems Widespread Use of Browsers (Continued) 7

8 Forces Behind Web-Enabled Systems Widespread Use of Browsers (Continued) Flexibility Plug-ins: Software programs that extend the capabilities of your Internet browser, giving it added features. Universal front-end application 8

9 Forces Behind Web-Enabled Systems Legacy System Legacy System: Refers to the many mainframe, midrange, client/server or PC applications that are used to manage business functions. 9

10 Forces Behind Web-Enabled Systems Interconnected Enterprises Interoperability: The perfect exchange of data and information in all forms (data, text, sound, and image, including animation) between the individual components of an application (hardware, software, network). Heterogeneous Applications: May be written in different programming languages, run on different types of computers, and use varying communications networks and transmission methods. 10

11 Extensible Markup Language Definition Extensible Markup Language (XML): Developers can design their own customized markup languages for describing data. 11

12 Extensible Markup Language Structure of XML 12

13 Extensible Markup Language XML Advantages 13

14 Extensible Markup Language Document Type Definition Document Type Definition (DTD): Defines the vocabulary (or standard) to make the data easily understandable and useable. 14

15 Extensible Markup Language Document Type Definition (DTD) (Continued) 15

16 Extensible Markup Language Presentation Using XML Style Sheets Presentation Using XML Style Sheets XML Stylesheet Language (XSL): Created by developers or publishers of XML data to manage the display and presentation of information in a document. 16

17 Extensible Markup Language Processing XML 17

18 Extensible Markup Language Processing XML (Continued) 18

19 Web Services Definition Web Services: Modular Internet applications that perform a very specific function or task. 19

20 Web Services Web Services Principle 20

21 Web Services Simplified Object Access Protocol Simplified Object Access Protocol (SOAP): The protocol used by an application to invoke a Web service located on another computer. 21

22 Web Services Simplified Object Access Protocol 22

23 Web Services Web Services Description Language Web Services Description Language (WSDL): Describes the capabilities offered by a specific Web service as well as the protocols and formats the service uses. 23

24 Web Services Web Services Description Language 24

25 Web Services Universal Description, Discovery, and Integration Universal Description, Discovery, and Integration (UDDI): A worldwide directory for registering, finding, and using Web services. Yellow Pages: Describe the services offered by UDDI. Green Pages: Describe how an application can use the Web Services. 25

26 Web Services Universal Description, Discovery, and Integration (Continued) 26