How do I format based on the value of the @status attribute?

Example: I use the @status attribute to indicate that a step in a procedure is new or that a paragraph in a concept is new.

For review purposes, I want to format new text as green - preferably a green highlight, but green text will do.

Example: I use the @status attribute to indicate that a step in a procedure has been deleted or that a paragraph in a concept has been deleted.

For review purposes, I want to format new text as crossed out.

Can this be done? If so, where do I set up the formatting for attribute values?

Thanks in advance.

Marsha