This document summarizes a seminar on XML and XML processors. It introduces XML and compares it to HTML. It describes the structure of an XML document including the prolog, data instance, and logical and physical structures. It also discusses XML processors and parsers, including DOM and SAX parsers. The document provides examples of DOM and SAX parsing approaches.
What is XML
• XML stands for EXtensible Markup Language
• XML was designed to carry data, not to display data
• XML developed by the World Wide Web
Consortium (www.W3C.org)
• XML like HTML is a mark up language, but
unlike HTML it doesn’t have predefined
elements
XML Versions
version XML 1.0 was initially defined in 1998
version XML 1.1 was initially published on 4th Feb 2004
Example language of xml structure
XHTML
WML AND WAP
SVG
Uses XML
WEB DEVELOPER
TRANSPORTING AND SHARING DATA
STORING DATA
DOCUMENTATION
ANDROID DEVELOPER
XML Doc Advantages
Easy data sharing, text documents are readable between any device.
Easy to learn.
Extendable.
Freedom to define tags.
Easy searching.
Disadvantages of XML
The redundancy may affect application efficiency through higher storage, transmission and processing costs.
XML Document Components
The various components of an XML document used for representing data in a hierarchical order are:
Processing Instruction (PI)
Tags
Elements
Content
Attributes
Entities
Comments
What is XML
• XML stands for EXtensible Markup Language
• XML was designed to carry data, not to display data
• XML developed by the World Wide Web
Consortium (www.W3C.org)
• XML like HTML is a mark up language, but
unlike HTML it doesn’t have predefined
elements
XML Versions
version XML 1.0 was initially defined in 1998
version XML 1.1 was initially published on 4th Feb 2004
Example language of xml structure
XHTML
WML AND WAP
SVG
Uses XML
WEB DEVELOPER
TRANSPORTING AND SHARING DATA
STORING DATA
DOCUMENTATION
ANDROID DEVELOPER
XML Doc Advantages
Easy data sharing, text documents are readable between any device.
Easy to learn.
Extendable.
Freedom to define tags.
Easy searching.
Disadvantages of XML
The redundancy may affect application efficiency through higher storage, transmission and processing costs.
XML Document Components
The various components of an XML document used for representing data in a hierarchical order are:
Processing Instruction (PI)
Tags
Elements
Content
Attributes
Entities
Comments
This presentation educates you about Python - XML Processing, XML Parser Architectures and APIs (Simple API for XML (SAX),Document Object Model (DOM) API), Parsing XML with SAX APIs, The make
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This presentation educates you about Python - XML Processing, XML Parser Architectures and APIs (Simple API for XML (SAX),Document Object Model (DOM) API), Parsing XML with SAX APIs, The make
_parser Method, The parse Method, The parseString Method.
For more topics stay tuned with learnbay.
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1. Seminar On:
XML & XML
Processor
Submitted By: Himanshu Soni
Branch: CS
Roll No: 1301410040
Subject: Web Technolgy
(NCS-504)
Introduction to XML
HTML Vs XML
Structure of XML Document
XML Processor
Parser
DOM & SAX
References
2. Introduction to XML
What is XML ?
XML is an acronym for “eXtensible Markup
Language”.
XML is a markup language derived from
SGML (Standard Generalised Markup
language).
It is used to store data in structured format.
3. HTML vs XML
HTML XML
HTML document formats and
displays web page data.
XML document carry data along
with their description.
Predefined tags (Predefined
markup language).
Not have predefined tags.You
can create and define new tags
as per your needs.(Meta
Language).
May not have closing tag. Must have closing tag.
Not Case Sensitive. Case Sensitive.
Directly Viewable in browser. Viewable if proper Stylesheet
provided.
5. Structure of XML Document System
A style sheet presentation through CSS or XSL.
A grammer structure through DTD.
A semantics of data through XML file.
Semantics and
data,
XML file
Grammer
Structure,
DTD
Syle-sheet,
CSS or XSL
6. Structure of XML file
XML file has –
-a logical structure and
- a physical structure
Logical Structure:
It refers to different parts of
document i.e., how document is built.
Physical Structure:
It refers what document actually
contains.
7. Logical Structure
-prolog (preface or introduction to XML document)
-data instance (the real or actual data)
Prolog Data Instance
An XMl declaration
Processing Instruction
A document type definition
Comments
White Spaces
Element types, tags and
names
White Spaces
8. Prolog
XML declaration
<? xml version=“1.0” encoding= “UTF-8” standalone=“no” ?>
Processing Instruction
<? xml-stylesheet type=“text/css” href=“main.css” ?>
Document Type Declaration (DTD)
<! DOCTYPE rootElement SYSTEM DTD_File_Name.dtd>
Comments
<!– Listen Here -->
White Spaces
Spaces, tabs, linebreak
9. XML Processor
When a software program reads an XML
document and takes actions accordingly, this
is called processing the XML.
Any program that can read and process XML
documents is known as an XML processor.
An XML processor reads the XML file and
turns it into in-memory structures that the
rest of the program can access.
10. What is Parser?
The word parser comes from compilers. In a
compiler, a parser is the module that reads and
interprets the programming language.
Parsers are software components that decode XML
files on behalf of the application
There are two basic ways to interface a parser with
an application:
-object-based interfaces
-event-based interfaces
11. Architecture of XML Program
Divided into two parts:
• The parser deals with the XML file.
• The application consumes the content of the file through the
parser.
Here application can be very simple (such as printing information on
the screen), or quite complex (such as a browser or an editor)
12. Object-based Interface
Using an object-based interface, the parser explicitly builds
a tree of objects that contains all the elements in the XML
document.
Tree-based parsers deal generally small documents
Example-
<?xml version=”1.0”?>
<products>
<product>
<name>XML Editor</name>
<price>499.00</price>
</product>
<product>
<name>DTD Editor</name>
<price>199.00</price>
</product>
<products>
14. Event-based Interface
With an event-based interface, the parser does not explicitly
build a tree of objects.
Instead, it reads the file and generates events as it finds
elements, attributes, or text in the file.
There are events for element starts, element ends,
attributes, text content, entities, and so on.
Event-based parsers deal generally used for large
documents
An event-based API
15. DOM
The Document Object Model (DOM) is an
application programming interface (API) for HTML
and XML documents.
It defines the logical structure of documents and
the way a document is accessed and manipulated
Programmers can build documents, navigate their
structure, and add, modify, or delete elements and
content i.e.
The API allows for constructing, accessing and
manipulating the structure and content of XML
documents
Basically, DOM is object based parser
17. SAX
SAX (Simple API for XML) is an event-
driven algorithm for parsing XML documents.
SAX provides a mechanism for reading data from
an XML document.
SAX parsers operate on each piece of the XML
document sequentially.
SAX parsing is unidirectional; previously parsed
data cannot be re-read without starting the
parsing operation again
18. SAX vs DOM Parsing: Efficiency
The DOM object built by DOM parsers is usually
complicated and requires more memory storage than
the XML file itself
A lot of time is spent on construction before use
For some very large documents, this may be
impractical
SAX parsers store only local information that is
encountered during the serial traversal.
Hence, programming with SAX parsers is, in
general, more efficient but difficult to implement
sonetime.
19. References
Benoit Marchal. XML by Example. 1 edition. QUE
(14 December 1999)
Pankaj Sharma. Introduction to Web Technology.
S.K. Kataria & Sons
Sumita Arora. Informatics Practices. Dhanpat Rai &
Co. (P) Ltd., Delhi 2010
https://en.wikipedia.org/wiki/XML