# What is the exact font-family name when using XeLaTeX/fontspec?

I'm now using XeLaTeX and fontspec(also uses xeCJK). I use

\setmainfont{Georgia}

to set my default English font, and

\setCJKmainfont{cwTeX Q Ming}

to set my default Chinese font.

However, if I want to use the commands, such like \DeclareSymbolFont {<sym-font-name>} {<encoding>} {<family>} {<series>} {<shape>}, and assign the current font family I'm using. What name of the family should I fill into? (Also, what's the proper font-encoding? OT1?) I'd looked up the fontspec document, but didn't find the solution.