TimeML schema
timeml.org
A TimeMLID is a sequence of lowercase letters followed by a number (decimal digits).
A EventID is an e followed by a number (decimal digits).
A EventInstanceID is an ei followed by a number (decimal digits).
A TimeID is an t followed by a number (decimal digits).
A SignalID is an s followed by a number (decimal digits).
A LinkID is an l followed by a number (decimal digits).
The Probability of an annotation is a number between 0.0 and 1.0.