Dear ram....
very good explaination .....
i read ur pen work three times ,now i'm having clear picture 'bout it..
now i want to implement a small application for the example what u 've given (book
industry)...
whenever i ask people 'bout implementation they start talking about readymade
parsers,already defined dtds and all.
but this time i want to go purely on my feet..........mean to say i want to define
my own dtd ,rite my own parsers,own xsl ,own converter and all ..
so could u u pl tell me how to start with ..i've downloaded the Doczilla browser
,and working on win98 ,jswdk1.0,jwsr2.0,oracle(but for this i would use msaccess)
first step
i'm having tables about books in database ..
then what next ........
thanx in ad/
piyush
"S.Ramaswamy" wrote:
> Jyoti Parthasarathy wrote:
>
> > I have found a tutorial in www.msdn.microsoft.com
> > http://msdn.microsoft.com/xml/all/ This is the url for the Tutorial on XML
> > But it is pretty advanced.
> > As far as how it is used in projects - I think some e-commerce projects use
> > XMl though I do not know the URL for any such example.
> >
> > As T mentioned certainly databases are faster - but I think XML is just one
> > way of transferring data across the net. It is as good as transferring a
> > view to the database across the web.
> > As far as I have understood,databases are reqd at both ends(server as well
> > as client side). Only picking up data from the page and putting it into the
> > database on the client side is simpler if XML is used.
> > If somebody has another view plz share it.
> >
> > Jyoti
>
> XML was thought of as next version of HTML 4.0. HTML 3.0 had certain fixed
> number of tags. HTML 4.0 introduced a lot more tags to accomodate the ever
> growing need for formats. But this had to stop. Why?
>
> Firstly the tags used in HTML are fixed by what the browser can understand.
> Theoritcally you can keep on introducing the tags. But practically the browser
> has to implement them. Secondly, the tags were restricted to merely
> presentational aspects and did not contain any information about the content of
> the document.
>
> Enter XML. XML by itself does not have any predefined tags. It is upto
> different user communities to decide upon their tags. For e.g. book industry
> might have tags like title, author, isbn, price etc. If you use XML then your
> will have your data as follows
>
> <xml version="1.0">
>
> <books>
> <book>
> <title>An introduction to XML</title>
> <author>Sameer Kochar</author>
> <isbn>80-1289110</isbn>
> <price>
> <currency>Rs.</currency>
> <amount>560.00</amount>
> </price>
> <book>
> <book>
> ....................
> </book>
> <books>
>
> Why has XML has been thought of as a layer above databases?
>
> 1) As XML follows the simple text format and has starting and closing tags. You
> can have represent any hierarchy using XML. It is very easy to interpret the
> XML.
>
> For presenting the data to user there are styling languages available called
> XSL (Extensible Styling Language) that can take your XML and apply formatting
> to it. For e.g. the above XML can be converted using XSL as follows. I am
> writing it in pseudo code
>
> <xsl:stylesheet>
> <HTML>
> <HEAD>
> </HEAD>
> </BODY>
> <table>
> <caption> BOOKS </caption>
> <tr>
> <td>Title</td>
> <td>author</td>
> <td>isbn<td>
> <td>price</td>
> </tr>
> apply the templates for the tags
> </table>
>
> a) TEMPLATE for every <books> tags encountered
> <tr>
> apply templates for the lower level tags(i.e book etc.)
> </tr>
>
> b) TEMPLATE for every <book> encountered
> <td> value of the book tag </td>
>
> c) TEMPLATE for every <author> encountered
> <td> value of the author </td>
>
> d) TEMPLATE for every <isbn> encountered
> <td> value of the isbn tag </td>
>
> e) TEMPLATE for every <price> encountered
> <td> value of the price tag </td>
>
> Now using the XML + XSL, I can produce the desired output. Now if you do it in
> a servlet the output can go to the browser. If I want a different styling I can
> just use a different XSL but the same XML.
>
> ON the other hand, there does not exist any efficient mechanism to insert,
> update, and query the data contained in XML. Hence you still need the good old
> databases for that.
>
> ==--==--==--==--==--==--==--==--==--==--==--==--==--==
> S.Ramaswamy
> Matrix Infotech Syndicate
> D-7, Poorti, Vikaspuri, New Delhi, 110018, India
> PHONE: +91-11-5610050, FAX: +91-11-5535103
> WEB http://MatrixInfotech.HyperMart.Net
> ==--==--==--==--==--==--==--==--==--==--==--==--==--==
>
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