How can I define a RAML spec for a POST method taking an array of string as parameters


I am trying to publish a RAML for a post method of a restful web service which takes an array of strings. Basically , I want to have one parameter called colour which and I want to be able to pass in multiple values such as:

colour: {blue, red, white}. So i want one parameter but multiple values.

I am not sure how to publish the RAML for that though I did consult the RAML tutorials.

Any pointers would be greatly appreciated