Section 4.4 of VOTable 1.4 references VOUnits as the recommended syntax for the unit attribute, but the summary in the text ("no special symbol is required for a power") and some of the examples ("m2" and "cm-2.s-1.keV-1") are incorrect with respect to the VOUnits standard, which uses "**" for raising to a power. The examples and text, which were presumably left over from pre-VOUnit days, should be updated.
It's also not clear from the text whether VOUnits are REQUIRED or RECOMMENDED; it says
The syntax of the unit string is defined in reference [3]
but also
Reference [3] contains the recommended rules for writing string representations of the unit strings, called VOUnits.
Section 4.4 of VOTable 1.4 references VOUnits as the recommended syntax for the
unit
attribute, but the summary in the text ("no special symbol is required for a power") and some of the examples ("m2
" and "cm-2.s-1.keV-1
") are incorrect with respect to the VOUnits standard, which uses "**
" for raising to a power. The examples and text, which were presumably left over from pre-VOUnit days, should be updated.It's also not clear from the text whether VOUnits are REQUIRED or RECOMMENDED; it says
but also
This should be clarified.