\cdbreserved{sum}{}

Denotes a generic sum of objects. The parser translates objects
separated by a ``$+$'' symbol tol sums.

The default properties of \verb|\sum| are
\begin{verbatim}
\sum{#}::CommutingAsSum.
\sum{#}::DependsInherit.
\sum{#}::IndexInherit.
\sum{#}::WeightInherit(label=all, type=Additive).
\end{verbatim}
~


\cdbseealgo{sumsort}
