question: public String parse ( String controlTemplate , Context controlContext ) throws Exception { this . controlContext = controlContext ; fillContextDefaults ( this . controlContext ) ; fillContextProperties ( this . controlContext ) ; Template template = getTemplate ( controlTemplate , inputEncoding ) ; StringWriter sw = new StringWriter ( ) ; template . merge ( controlContext , sw ) ; return sw . toString ( ) ; }
target:  Parse the control template and merge it with the control context. This is the starting point in texen.