XML Simplified

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Module 1 Introduction to XML Concepts 1.1.5 Advantages and Disadvantages of XML The benefits of XML are as follows: ‣ ¾ Data independence Data independence is the essential characteristic of XML. It separates the content from its presentation. Since an XML document describes data, it can be processed by any application. ‣ ¾ Easier to parse The absence of formatting instructions makes it easy to parse. This makes XML an ideal framework for data exchange. ‣ ¾ Reducing Server Load Because XML’s semantic and structural information enables it to be manipulated by any application, much of the processing that was once earlier limited to servers can now be performed by clients. This reduces server load and network traffic, resulting in a faster, more efficient Web. ‣ ¾ Easier to create It is text-based, so it is easy to create an XML document with even the most primitive text processing tools. However, XML also can describe images, vector graphics, animation or any other data type to which it is extended. ‣ ¾ Web Site Content The W3C uses XML to write its specifications and transforms it to a number of other presentation formats. Some Web sites also use XML for their content and get it transformed to HTML using XSLT and CSS and display the content directly in browsers. ‣ ¾ Remote Procedure Calls XML is also used as a protocol for Remote Procedure Calls (RPC). RPC is a protocol that allows objects on one computer to call objects on another computer to do work, allowing distributed computing. ‣ ¾ e-Commerce XML can be used as an exchange format in order to send data from one company to another. Version 1.0 © Aptech Limited XML Simplified
Module 1 Introduction to XML Note: The process of manipulating an XML document is called as XML Parsing. The parser loads the document into the memory. After the document is loaded into the memory, Document Object Model (DOM) manipulates the data. Even though XML has many advantages, it has a few disadvantages too. Some of the disadvantages are as follows: Concepts ‣ ¾ Usage of XML leads to increase in data size and processing time. Since XML uses Unicode encoding set for characters, it also consumes more memory. ‣ ¾ XML lacks adequate amount of processing instructions. If the process of translation is not used, then the developers globally are forced to prepare their own processing instructions to display XML in the required form. ‣ ¾ XML is more demanding and difficult as compared to HTML. ‣ ¾ XML is verbose and wordy as the tags used in it are predefined. ‣ ¾ Versions of Internet Explorer (IE) earlier than 5.0 do not support XML. Knowledge Check 1 1. Which of the following statements are true and which are false in the case of XML? (A) (B) (C) (D) (E) XML was designed to describe data. XML tags are predefined. XML consists of rules to identify and define different parts of the document. XML offers a standard way to add markup to documents. XML forms the basis to create languages like WAP and WML. 2. Which of the statements about XML are true and which of the statements are false? (A) (B) (C) (D) (E) XML describes its data along with its presentation. Client reduces the server load by sending large amount of information in one XML document to the server. XML uses only XSLT to be transformed to HTML. XML can be implemented as middle-tier for client server architectures. XML allows data exchange as it has no formatting instructions. XML Simplified Version 1.0 © Aptech Limited
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Page 49 and 50: Module 2 Namespaces Module Overview
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Module 3 DTDs The following code de
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Module 3 DTDs Figure 3.3 depicts th
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Module 3 DTDs 3.3.2 Valid XML docum
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Module 3 DTDs 3.4.1 Declaring Eleme
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Module 3 DTDs Value Description Syn
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Module 3 DTDs ‣ ¾ #FIXED ‣ ¾
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Module 3 DTDs Mixed content entitie
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Module 3 DTDs The following code de
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Module 3 DTDs (C) (D) ]>
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4Module XML Schema Module Overview
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Module 4 XML Schema The following X
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Module 4 XML Schema Figure 4.3 depi
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Module 4 XML Schema The additional
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Module 4 XML Schema The following c
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Module 4 XML Schema The built-in da
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Module 4 XML Schema Syntax: Code S
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Module 4 XML Schema 4.3.1 Complex T
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Module 4 XML Schema 4.3.2 Defining
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Module 4 XML Schema Knowledge Check
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Module 4 XML Schema 4.4.2 Datatypes
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Module 4 XML Schema There are 12 fa
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Module 4 XML Schema ‣ ¾ Fixed Th
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Module 4 XML Schema Module Summary
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5Module Style Sheets Module Overvie
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Module 5 Style Sheets ‣ ¾ Extens
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Module 5 Style Sheets ‣ ¾ value
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Module 5 Style Sheets url is the UR
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Module 5 Style Sheets Syntax: #attr
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Module 5 Style Sheets Figure 5.11 s
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Module 5 Style Sheets The output is
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Module 5 Style Sheets Color { paddi
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Module 5 Style Sheets Figure 5.38 s
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Module 5 Style Sheets value Floatin
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Module 5 Style Sheets 5.4.2 Inherit
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6Module XSL and XSLT Module Overvie
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Module 6 XSL and XSLT XSL consists
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Module 6 XSL and XSLT 6.1.5 XSLT St
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Module 6 XSL and XSLT NaN="string":
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Module 6 XSL and XSLT The following
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Module 6 XSL and XSLT The following
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Module 6 XSL and XSLT The built-in
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Module 6 Figure 6.7 shows the code
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Module 6 XSL and XSLT Knowledge Che
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Module 6 XSL and XSLT Module Summar
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Module 7 More on XSLT XPath provide
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Module 7 More on XSLT Concepts 7.2
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Module 7 More on XSLT 7.2.6 String
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Module 7 More on XSLT Concepts 7.3.
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Answers to Knowledge Checks Answers
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Answers to Knowledge Checks Answers
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