Vocabulary: http://www.ivoa.net/rdf/datalink/core Author: Markus Demleitner Date: 2020-09-09 Term: #calibration Action: Modificiation Description: Data products that can be used to remove instrumental signatures from #this. Note that the calibration steps such data products feed have not been applied to #this yet. To link calibration data already reflected in #this, use #progenitor. Used-in: http://dc.g-vo.org/kapteyn/q/dl/dlmeta?ID=ivo%3A//org.gavo.dc/~%3Fkapteyn/data/fits/POT015_000317.fits Term: #bias Action: Modification Description: Data products that can be used to remove detector offset levels from #this. Term: #dark Action: Modification Description: Data products that can be used to remove detector dark current from #this. Term: #flat Action: Modification Description: Data products that can be used to remove the signature of non-homogeneous detector sensitivity from #this. Rationale: In a discussion on the semantics mailing list (see http://mail.ivoa.net/pipermail/semantics/2020-June/002735.html and follow-ups) it was found that the existing descriptions of #calibration and its narrower terms are ambiguous; "resource used to calibrate" could mean both "resource that has been used" or "resource that can be used". This VEP tries to make it clear that the "has been used" interpretation is for #progenitor, wheras #calibration is for "can be used".