reg:Polygon 

A polygon is a shape delineated by a list of vertices connected with lines, great circles, or small circles; the inside of the polygon is circumscribed counter-clockwise by the list of vertices; the polygon may be concave but not self-intersecting; the last vertex in the list is the predecessor of the first.  For celestial coordinates it is assumed that we are looking at the sphere from the inside, with Right Ascension increasing to the left. Sides should span less than 180 deg in each coordinate.

Element Information

Model

reg:Vertex+
Children: reg:Vertex

Attributes

QName Type Fixed Default Use Inheritable Annotation
fill_factor restriction of xs:double 1.0 optional 
The fill_factor (value between 0 and 1) indicates the fraction of the region that is actually included; possible application: large scale resource coverage areas
note xs:string optional
unit crd:posUnitType deg optional

Source 

<xs:element name="Polygon" type="reg:polygonType" substitutionGroup="reg:Region">
  <xs:annotation>
    <xs:documentation>A polygon is a shape delineated by a list of vertices connected with lines, great circles, or small circles; the inside of the polygon is circumscribed counter-clockwise by the list of vertices; the polygon may be concave but not self-intersecting; the last vertex in the list is the predecessor of the first. For celestial coordinates it is assumed that we are looking at the sphere from the inside, with Right Ascension increasing to the left. Sides should span less than 180 deg in each coordinate.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample