[Therion] code tex-map if/else

Hello all Is it possible to build an if/else block within tex code and check on special content of a variable so you can do different things depending on the content of the variable? All I could find so far is just to check if the variable is not empty (\edef\tmp{\the\copyrights}\ifx\tmp\empty\else...\fi). For example: Set a variable with content "a": \def\thvariable{a} \def\thcontentA{a} \def\thcontentB{b} ... % if content is "a": \ifx\thvariable\thcontentA .... \fi % if content is "b": \ifx\thvariable\thcontentB .... \fi Thanks in adavance. Torsten