HTML5 & XHTML role attribute question

Question

Does the role attribute have defined values if so can you tell what they are?

Or can I create my own values for the role attribute if is so are they case-sensitive do they have to be letters can there be numbers or both?

Or can you have both defined values and user created values.

Answer 1

A quick google turned up this: Semantics in HTML 5.

According to that site, the values of the role attribute are a space separated list of words from the XHTML Vocabulary.