SourceSpatialReference is optional. The default is null. Note: only one of: o SourceSpatialReference o SourceWkid, and SourceVcsWkid if applicable o SourceWkt, and SourceVcsWkt if applicable needs be set. If the SourceSpatialReference is set, the Wkids and Wkts are ignored. If the SourceSpatialReference is null, then the Wkids are used. If the Wkids are 0 (or less), then the Wkts are used.