Metadata support in GRASS 7
Brad Douglas suggests (2010):
It would be very advantageous to at least support metadata as specified in FGDC-STD-012-2002. XML is an ideal file format.
Nick Lawrence suggests (2010):
The GIMP project is examining the concept of a general multi-layer bitmap format.
Hamish writes (2012):
The pycsw project may be of interest: