Represents an instance of the IVOA STC class Stc
http://hea-www.harvard.edu/arots/nvometa/STC.html
The Stc class does not have a constructor function of its own, as it is simply a container class for a family of specialised sub-classes including StcCatalogEntryLocation, StcResourceProfile, StcSearchLocation and StcObsDataLocation.
RegionClass: The class name of the encapsulated Region.
’
s:
AST_GETSTCREGION: Get a pointer to the encapsulated Region
AST_GETSTCCOORD: Get information about an AstroCoords element
AST_GETSTCNCOORD: Returns the number of AstroCoords elements in an Stc