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- adding documentation on the new tags <algebra> <chem> <num> <parse>

\label{Authoring_Output_Tags}


This group of tags generates useful output. 

\begin{itemize}
\item \textbf{algebra}\index{algebra}: Typesets algebraic expressions
\begin{verbatim}
  <algebra>2x^y+sqrt(3/x^2)</algebra>
\end{verbatim}
\item \textbf{chem}\index{chem}: Typesets chemical equation 
\begin{verbatim}
  <chem>02 + 2H2 -> 2H20</chem>
\end{verbatim}
\item \textbf{num}\index{num}: Typesets a number 
\begin{verbatim}
  <num format=''2E''>31454678</num>
\end{verbatim}
\item \textbf{parse}\index{parse}: to display the parsed view of a variable's
contents
\begin{verbatim}
  <script type=''loncapa/perl''>
   $table='<table>';
   for ($i=1;$i<=10;$i++) {
      $table.='<tr><td>'.$i.'</td><td>'.&random(1,10,1).'</td></tr>';
   }
   $table.='</table>';
  </script>
  <parse>\$table</parse>
\end{verbatim}

\item \textbf{standalone}\index{standalone}: Everything inbetween the
start and end tag is shown only on the web and only if the resource
is not part of a course. 
\item \textbf{displayduedate}\index{displayduedate}: This will insert the
current due date if one is set in the document. It is generated to
be inside a table of 1x1 elements.
\item \textbf{displaytitle}\index{displaytitle}: This will insert the title
of the problem from the metadata of the problem. Only the first \textbf{displaytitle}
in a problem will show the title; this allows clean usage of \textbf{displaytitle}
in stylesheets.
\item \textbf{window}\index{window}: The text inbetween is put in a pop-up
javascript window.
\item \textbf{m}\index{m}: The inside text is \LaTeX{}, and is converted
to HTML (or MathML) on the fly. If the attribute \textbf{eval} is
set to {}``\textbf{on}'' the intervening text will have a perl variable
expansion done to it before being converted. 
\item \textbf{randomlabel}\index{randomlabel}: This shows a specified image
with images or text labels randomly assigned to a set of specific
locations. Those locations may also have values assigned to them.
A hash is generated that contains the mapping of labels to locations,
labels to values, and locations to values. Example: \begin{verbatim}

 <randomlabel bgimg="URL" width="12" height="45" texwidth="50">
    <labelgroup name="GroupOne" type="image">
      <location x="123" y="456" value="10" />
      <location x="321" y="654" value="20" />
      <location x="213" y="546" value="13" />
      <label description="TEXT-1">IMG-URL</label>
      <label description="TEXT-2">IMG-URL</label>
      <label description="TEXT-3">IMG-URL</label>
    </labelgroup>
    <labelgroup name="GroupTwo" type="text">
      <location x="12" y="45" />
      <location x="32" y="65" />
      <location x="21" y="54" />
      <label>TEXT-1</label>
      <label>TEXT-2</label>
      <label>TEXT-3</label>
    </labelgroup>
   </randomlabel>
    
\end{verbatim} Possible attributes are:

\begin{itemize}
\item \textbf{bgimg}\index{bgimg}: Either a fully qualified URL for an
external image or a LON-CAPA resource. It supports relative references
(../images/apicture.gif). The image must either be a GIF or JPEG.
\item \textbf{width}\index{width}: The width of the image in pixels.
\item \textbf{height}\index{height}: The height of the image in pixels.
\item \textbf{texwidth}\index{texwidth}: The width of the image in millimeters.
\end{itemize}
\end{itemize}