[xwiki-users] Using tables and xclasses

Hi, I created a xwiki class with more attributes which represent the columns of a table. I need to write data in that table and also to get data from the table such that i will can compute an average for example (with that values) and after that i want to put/write the result in the same table. The page I have created using the class contains the attributes of the class, which I can modify, but I need the table. So, my question is: How can I make the table such that I will can write in it and get data from it? Also, how can I export that table as pdf document? Thank you!