class Event{
	String ^id
	String title
	String summary
	String location
    String description
	LocalDateTime start
	LocalDateTime end
	LocalDateTime created
	LocalDateTime lastModified
	String status
	String source
}

type LocalDateTime wraps LocalDateTime
create{
	LocalDateTime.parse(it, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))
}convert{
	if( it !== null ) DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").format(it)
}

[Event returns Event:
	{Event}
	'Event' '('
		('start' start=LocalDateTime)?
		('end' end=LocalDateTime)?
		('title' title=EString)?
		('location' location=EString)?
	')';

EIntegerObject returns ecore::EIntegerObject:
	'-'? INT;

LocalDateTime returns LocalDateTime:
	'LocalDateTime' /* TODO: implement this rule and an appropriate IValueConverter */;