wht_type: wht_polyline
WhiteStar polyline features contain either a single line or an aggregate of lines. When reading a WhiteStar entity, the reader will aggregate all linear elements for a single entity into one LINE feature. Similarly, the writer will put all lines contained in a single LINE feature into one entity in the output WhiteStar file.
The “implied closure” flag of the entity header will always be reflected in the feature type of the feature representing the entity. If the flag is set to “0” in an input WhiteStar file, LINE features will be generated. Conversely, LINE entities are written with the “implied closure” flag in the entity header set to a value of “0”.