ROS Action translator node

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Hello everybody,

For a personal project, I want to create a ROS action translator node that will works as a middle person :

• The node will receive a message, let's say "Hello"
• It will change that to "Good morning"
• Send back the new message to the node that requested the action.

I want to do that for a predefined list of words that I have with it's translation, something like this but in an XML file probably :

• Hello ----> Good morning

• Bye ----> See you

• robot_pr2 -----> robot_pr2_x5

Do you have any idea how I can perform that in a good way ? or I must do a string comparison for each word received with all my list till I found the right one ?

Thank you