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Clarify and correct Units section for VOUnits #51

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Nov 20, 2023
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Clarify and correct Units section for VOUnits #51

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b213d18
Clarify and correct Units section for VOUnits
mbtaylor Nov 14, 2023
6f23d83
replace erg/s with m/s in VOUnits example
mbtaylor Nov 17, 2023
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20 changes: 11 additions & 9 deletions VOTable.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -1140,15 +1140,15 @@ \subsection{Units}
some physical unit,
which is specified by the {\attr{unit}}
attribute of the {\elem{FIELD}}.
The syntax of the {\em unit} string is defined in
the VOUnit specification, \citet{2014ivoa.spec.0523D};
it is basically written as a string without blanks or spaces,
where the symbols {\bf.} or {\bf*} indicate a multiplication,
{\bf/} stands for the division, and no special symbol is required
for a power.
Examples are \attrval{unit}{m2} for m$^2$,
\attrval{unit}{cm-2.s-1.keV-1} for cm$^{-2}$s$^{-1}$keV$^{-1}$,
or \attrval{unit}{erg/s} for erg\,s$^{-1}$.
The syntax of the {\em unit} string SHOULD conform to
the VOUnits specification, \citet{2014ivoa.spec.0523D};
this requires a string without blanks or spaces
where multiplication is indicated by the symbol ``{\tt.}'',
division by the symbol ``{\tt/}''
and exponentiation by the symbol ``{\tt**}''.
Examples are \attrval{unit}{m**2} for m$^2$,
\attrval{unit}{cm**-2.s**-1.keV**-1} for cm$^{-2}$s$^{-1}$keV$^{-1}$,
or \attrval{unit}{m/s} for m\,s$^{-1}$.

\subsection{Unified Content Descriptors}
\label{sec:ucd}
Expand Down Expand Up @@ -2304,6 +2304,8 @@ \subsection{Differences Between Versions 1.4 and 1.5}
\item timescales for calendar epochs.
\item positioning advice for \attr{ID} and corresponding references.
\item noting that \elem{RESOURCE} elements can contain \elem{MIVOT} blocks.
\item \attr{unit} attribute SHOULD conform to VOUnits,
and correct examples accordingly.
\end{itemize}
\end{itemize}

Expand Down