RSS channel using tables

Can you give me a tip about how to improve an own RSS channel, but using tables?
I already have a RSS channel (text only).
I need a channel where I could actualize only the values set in a table.
Thanks. Diego

I am not sure if you can do just that, checkout the custom RSS:

http://mediasignage.com/html/signage_video.html?videoNumber=customRSS

The video about Custom RSS shows how to use an RSS Channel, and it works fine.
What I need is to know a tool that allow me to create the file where the custum url will look for.
I tried with "RSS Builder", but it doesn´t work with tables and with images.
It works OK with text.
Could you give me a tip of a program to create my rss file based on tables and images?.
Thanks. Diego