Word features in XL?
 

I am looking for a way to give my users certain capabilites in XL that exist in Word but not XL. Most of these relate to editing/data entry features, but they have to operate on a cell in XL. For example, bold and italicize a specific word in an XL cell. Another would be to enforce a maximum word count. I am wondering if XML DTD's might help here. For example, having an "element" in a DTD that has a max size and then associate that element to a cell.

I am looking for information/sources of information that would help me better understand what my options are and how to perform these tasks. Would appreciate any help

Thanks.