The Astronomy Visualization Metadata standard defines a taxonomy for astronomical objects.6 The main categories are:
Astronomy Visualization Metadata Standard http://www.virtualastronomy.org/avm_metadata.php ↩
AVM 1.1 Final Candidate http://www.virtualastronomy.org/avm_1.1_final_draft.pdf ↩
ESO Images in a Universal Context - Astronomical metadata to provide better access to space images http://www.eso.org/public/announcements/ann12018/ ↩
PinpointWCS Archived August 11, 2011, at the Wayback Machine https://www.cfa.harvard.edu/~akapadia/pinpointwcs/ ↩
FITS Liberator http://www.spacetelescope.org/projects/fits_liberator/ ↩
AVM 1.1 Final Candidate Appendix A http://www.virtualastronomy.org/avm_1.1_final_draft.pdf ↩