Where to write xml and xslt code.Is there any specific platform to write. I want to transform the xml file to html using xslt.
Please help

when you say transform xml to html, by that you mean, the html will be hosted on a webserver and accessed by others using a browser?

Or do you just want to read the data in the xml and html is your preferred document format?

Yes it is viewed in the browser.
Now i found that i can write in a xmleditor platform and check.
Should in nedd to install a parser

The first choice you need to make is whether to do the XSLT transformation on the server or in the browser. Both have advantages and disadvantages and it depends on the constraints that apply to your project. Another option is to convert the XML to HTML at publishing time (rather than on demand), so that your web site contains the static HTML generated as the output of the XSLT conversion. You will find all these options discussed in the case study in Chapter 19 of my book.

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference