\label{TEXDropEmptyColumns_attribute}

\textbf{TeXDropEmptyColumns} attribute allows you to supress printing of empty
columns in table. This option is useful when you have deal with big tables
(very often nested) with a lot of empty columns. Situation is typical in 
chemistry where tables are used for visualization of chemical reactions. 

Example:

\begin{verbatim}
<table TeXDropEmptyColumns="yes">
\end{verbatim}