I want to fetch the data from database and convert the fetched data into xml document
For this u need to first figure out which data base u would be using and which programming language if the answer is Microsoft then SQL Server2000 and ADO(.net) provides u with the API so that u can directly get the data in XML else u can use any Programming language (java ...) and any data base query the database get the result and convert the result to an XML document by using the Programming language and appropiate parser
u would need parser which can be free downloaded from the net once u decide which one u would be using
display this xml document data on the webpage and again fetching the user entered data from the webpage
for this u can use XSL(T) to render the information as HTML page and get the information back from the user or u can use a programm in ur language of choice and a parser.
converting into xml document and then storing back into the database
again u would need a program , parser to convert the data into appropiate sql satements and insert(update) data in the database
In order to do the above listed simple situation, what all should i use/download.
u would need a parser for sure and u r good to go
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