\label{Authoring_Foil_Structure_Tags}


All tags that implement a foil structure have an optional arg of \emph{max}
that controls the maximum number of total foils to show. 

\begin{itemize}
\item \textbf{foilgroup}\index{foilgroup}: required. Must surround all
foil definitions.
\item \textbf{foil}\index{foil}: required. The foil is defined by what
is delimited by the \textbf{foil} tag.
\item \textbf{conceptgroup}\index{conceptgroup}: optional. Surrounds a
collection of \textbf{foil}. When a problem is displayed, only one
of the contained \textbf{foil} is selected for display. It has one
required attribute \textbf{concept}.
\end{itemize}