The following describes the most significant changes which
occurred in the AST library between versions V3.7 and V4.0:
- Experimental support for reading IVOA Space-Time-Coordinates (STC-X)
descriptions using the XmlChanXmlChan class has been added. Support is included
for a subset of V1.20 of the draft STC specification.
- A new set of methods (AST_REBIN<X>/astRebin<X>) has been added to
the MappingMapping class. These are flux-conserving alternatives to the existing
AST_RESAMPLE<X>/astResample<X> methods.