XML (Extensible Markup Language) XML → 1st Version → Released

8/14/2019 XML (Extensible Markup Language) XML 1st Version Released

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XML (Extensible Markup

Language)

XML 1st version Released

1998

Till date XML 1.0 (1st version)

Towards data storage, the

alternative for HTML is provided

one language, which is called

XML.

XML as a storage can be used for

following cases.

To improve performance of web

server by maintaining offline

storage:


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Offline storage means a temporary

storage that is not connected to

database server.

Interaction takes place

Transmission of data from oneserver to another server by

maintaining platform independency:

WEB SERVER

DATABASE

SERVER

Producttable

Product

table (in

XML form)

CLIENT 1

1

CLIENT 2

CLIENT 3

CLIENT 4


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That means data can be transferred

from one web server to another web

server without depending onoperating system. It can be used

both on LINUX and Windows.

Basics of XML:

HTML is required for Web pagePresentation

XML is required for data storage.

We use XML document for data

storage.

It can be of two types.

1.Ordinary XML document.

It goes with only data storage

without any format.


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2.Well-formed XML document.It stores the data in a formatted

way.i.e with some standards or

rules.

The rules which has to be followedfor XML document are,

The extension of filename is

(.XML).

XML is case sensitive.XML supports user-defined tags.

i.e. storage

User defined tag

100

This user-defined tag will providemeaning for the data.


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The tag name should start with

alphabet or underscore.

(dont start with . Symbol)

XML supports only container tags.

XML document can have only

one-root element.

Example:

100 < /empno>

add

----


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EmpinfoXML document emp.

XML

XML PARSER: This is software,

which will interpret the XML

document.

There are two types of XML parsers.

Dom Parser (Document Object

Model Parser)This parser will act as a compiler,

but it will read the complete XML

document and writes to the

temporary memory in the

hierarchical structure and providesthis memory reference to the client

application.


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Sax Parser (Simple API For XML

Parser)

This will act as an interpreter,because it can read the data from the

XML document, Based on event

occurrence, this will not store the

data into the temporary memory.

This is also called as event basedparser.

Dom parser provides more

flexibility in the programming of

client application but consumes

certain amount of memory.

Sax parser does not provide

flexibility but consumes less amount

of memory.

Microsoft is providing DOM parserimplementation towards its

software. (Like VC++, VB,.Net etc)


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Sun Microsystems supports sax

parser mostly.

Microsoft Internet explore 5.0and onwards

Built-in DOM parser

VB

6.0

Asp

3.0. Net

Supports

DOM

parser

Example:

HTML Web PageClientApplication XML document [i.e.

emp. XML]


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XML tag (Under HTML)

It will send a request to

HTML interpreter to activate XML

parser [i.e. MSXML.DLL]

The parser will load XML document

into memory.

This temporary memory is termed as

XMLISLAND


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When you want to implement set of

rules and validations on XML

document. Then we require DTD

implementation.

Documents

XML (Extensible Markup Language) XML → 1st Version → Released