xml data compression
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24-01-2011, 09:18 AM

hello sir,
i am kukab..my seminar and presentation topic is xml data compression....i am in need of document and ppt for my seminar and presentation please send me the doc and ppt for xml data compression.
thank you[/size][/font]

hello sir,
i am kukab..my seminar and presentation topic is xml data compression....i am in need of document and ppt for my seminar and presentation please send me the doc and ppt for xml data compression.my email id is pretty_gurl0581@yahoo.com
thank you

seminar surveyer
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24-01-2011, 09:33 AM

Greg Leighton, Jim Diamond, Tomasz Müldner
February 18, 2005

A (brief) introduction to data compression
XML lossless data compression
New XML Compression Programs

XML Data Compression

A (brief) introduction to XML
Techniques for achieving XML compression
Traditional approaches – Huffman, LZ
Specialized approaches
XML Compression Programs

eXtensible Markup Language

separate syntax from semantics
support semi-structured data
support internationalization and platform independence
is self-describing (through labeling of the tree)

eXtensible Markup Language : 2

XML is a framework for defining markup languages:

no fixed collection of markup tags
each XML language is specialized for its own application domain
a common set of generic tools supports processing documents

XML: textual convention to represent tagged trees

eXtensible Markup Language : 3

<?xml version=“1.0”  encoding=“UTF-8”?>


   <Employee id=“123456”>

      <Name>Homer Simpson</Name>

      <Department>Sector 7-G</Department>


   <Employee id=“123457”>

      <Name>Frank Grimes</Name>

      <Department>Sector 7-G</Department>



Data Value

eXtensible Markup Language : 4

Correctness of an XML document:
Well-formed: complies with XML syntax
Valid: obeys the structure described in a grammar, such as XML schema document
Two kinds of XML parsers:

Why Compress XML?

XML is verbose:

Each non-empty element tag must end with a matching closing tag -- <tag>data</tag>
Ordering of tags is often repeated in a document (e.g. multiple records)
Tag names are often long

XML Compressors

View XML as a tree
Separate the tree structure and what is stored in leaves
Save the tree structure so that it can be restored
The compressed file may or may not remember the tree structure

breadfruit tree

XMill: Liefke and Suciu

Tree structure:
Start tags and attribute names are dictionary-encoded
(as T1, T2, etc.)
End tags replaced with ‘/’ token
Data values are replaced with their container number

<Book><Title  lang="English">Views</Title>






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