Gets and sets the target spatial reference wkt to be used to select the TargetSpatialReference for the
TransformationInfo object (used to populate a table row).
The TargetWkt is optional. The default is null. The TargetVcsWkt should also be defined if a vertical coordinate system needs to be selected. If the TargetWkt (and the TargetVcsWkt if applicable) is set, then the corresponding TargetSpatialReference with that wkt (and vcsWkt) will be selected for the TransformationInfo object. Note: only one of: o TargetSpatialReference o TargetWkid, and TargetVcsWkid if applicable o TargetWkt, and TargetVcsWkt if applicable need be set. If the TargetSpatialReference is set, Wkids and Wkts are ignored. If the TargetSpatialReference is null, then Wkids are used. If the Wkids are 0 (or less), then the Wkts are used.