Replace Empty value in XSLT file

Question

Hi Everyone,

I need to get it done asap, Please give me some solution
I have XSLT file which is used to load Web XSLTransform.

If the field value is Empty i have to replace it with my own value

eg <a></a>

<a>User</a>

XSLT values are getting loaded from DB. so i dono whether value will be empty or not..

I want to check ALL THE VALUES in XSLT dynamically

Advanced Thanks