How to ask to ros the service parameter data type

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I am learning ROS from the Wiki site and doing some commandos on the terminal to improve my understanding about it:

I would like to know what are the parameters of a Rosservice, I am doing something like:

$rosclient@rosclient-VirtualBox:~$ rosservice list

I get:

/clear /kill /reset /rosout/get_loggers

/rosout/set_logger_level /spawn

/teleop_turtle/get_loggers

/teleop_turtle/set_logger_level

/turtle1/set_pen

/turtle1/teleport_absolute

...etc etc

then I do:

$rosclient@rosclient-VirtualBox:~$ rosservice info /turtle1/teleport_absolute

and I get:

Node: /turtlesim

URI: rosrpc://rosclient-VirtualBox:40839

Type: turtlesim/TeleportAbsolute

Args: x y theta

but I need to know what x,y theta are... are float, ints or what (please note this example is pretty trivial to infer the data type, but I am looking for somthing like rosmsg <type>)

thanks