polygon constant
IRI for schema:polygon [Expects: https://schema.org/Text]
A polygon is the area enclosed by a point-to-point path for which the starting and ending points are the same. A polygon is expressed as a series of four or more space delimited points where the first and final points are identical.
Can be used on: https://schema.org/GeoShape
Implementation
static const polygon = IriTerm.prevalidated('https://schema.org/polygon');