addition of data types to command variables

Hi How about adding datatype keywords to command variables? Currently I am working on data entry using Annyang, and I have a few set types of entries which I need to recognise. For example, if I am just looking for a number, or a letter as a command variable, it should return just the number or letter. I know we can do this using callback function and resultMatch, but ,if I am not wrong, the whole phrase recorded is passed to the callback function and not the individual command variable or splat.

The keywords could be something like this (char) , (int),(string),(num_as_string)//can be used for inputting numbers in words such as "five hundred and forty" instead of 540. e.g: var command = { ':(int)tag kg':function{document.write(tag);} };