code: public static boolean isTokenSymbol(char c) {
          return (c == BEAN_SYMBOL
                  || c == TEMPLATE_SYMBOL
                  || c == PARAMETER_SYMBOL
                  || c == ATTRIBUTE_SYMBOL
                  || c == PROPERTY_SYMBOL);
      }
docs: Returns whether a specified character is the token symbol.
  
  @param c a character
  @return true, if a specified character is one of the token symbols