2). In another transformation I'm reading a html files using unparsed-text() function, now html data can have any number of 'img' tags. I want to use a loop to check all 'img' tags and want to change value of src attribute of each img tag - via string manipulation.

Here is a example java code what i want to achieve in xslt.

String htmlData; // varibale htmlData will have html contents of a files

while(htmlData.indexOf("img") != -1){
Do some processing then replace the value of src attribute then take a substring of html data to remove current img tag.
htmlData = htmlData.substring(htmlData.indexOf("img")+3);
}

Or with Saxon 9.2 you can use
http://www.saxonica.com/documentation9.2/extensions/functions/parse-html.html
to parse HTML into nodes.

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/