WatercourseLink

GML attribute	Vector tiles attribute
gml:identifier	id
flowDirection	flow_direction
length	length
fictitious	*
form	form
watercourseName	watercourse_name
*	watercourse_name_lang
watercourseNameAlternative	watercourse_name_alternative
*	watercourse_name_alternative_lang
startNode	*
endNode	*
centrelineGeometry	*