XML help

i need to create an assembler xml file that provides users with the ability to
select mulitple individual components and render them in a browser.

for example, the users have individual components they want to view on a page
- call them MODULEs
modules will be preformatted graphics and/or text stored in separate files.

	i.e.   module A = an image map
		module B = a clip of text with an image
		module C = a large block of text with a header graphic

my question is how do you assemble these individual components?  >> i was
thinking of creating some type of input form that provides users with drop
down list of values.  then have another file that assembles the user
selections on a page.  not sure how to start...

do you have any tips or sample code to help me get started?

many thanks,
Tiffany_Blake@xxxxxxx