Make id matching strict #11
Description
The grammar allows id values matching pattern ['a'..='z'|'A'..='Z']+ ['a'..='z'|'A'..='Z'|'0'..='9'|'+'|'-'|'.'|':'|'_']* but the Id type defined in parser.rs doesn't enforce that tokens match this pattern and incorrectly turns all tokens into Ids.
Maybe it is possible to fix this by implementing the FromStr for Id. If that's not possible then the validation would need to be added to the FromWord trait implementation for Id.