doc-src/System/present.tex

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\chapter{Presenting theories}\label{ch:present}

Isabelle provides several ways to present the outcome of formal developments,
including WWW-based browsable libraries or actual printable documents.
Presentation is centered around the concept of \emph{logic sessions}.  The
global session structure is that of a tree, with Isabelle Pure at its root,
further object-logics derived (e.g.\ HOLCF from HOL, and HOL from Pure), and
application sessions in leaf positions (usually without a separate image).

The \texttt{mkdir} (see \S\ref{sec:tool-mkdir}) and \texttt{make} (see
\S\ref{sec:tool-make}) tools of Isabelle provide the primary means for
managing Isabelle sessions, including proper setup for presentation.  Here the
\texttt{usedir} (see \S\ref{sec:tool-usedir}) tool takes care to let the
\texttt{isabelle} process run any additional stages required for document
preparation, notably the tools \texttt{document} (see
\S\ref{sec:tool-document}) and \texttt{latex} (see \S\ref{sec:tool-latex}).
The complete tool chain for managing batch-mode Isabelle sessions is
illustrated in figure~\ref{fig:session-tools}.

\begin{figure}[htbp]
  \begin{center}
    \begin{tabular}{lp{0.6\textwidth}}
      \texttt{isatool mkdir} & invoked once by the user to create the initial
        source setup (common \texttt{IsaMakefile} plus a single session directory); \\
      \texttt{isatool make} & invoked repeatedly by the user to
        keep session output up-to-date (HTML, documents etc.); \\
      \texttt{isatool usedir} & part of the standard \texttt{IsaMakefile} entry of a session; \\
      \texttt{isabelle} & run through \texttt{isatool usedir}; \\
      \texttt{isatool document} & run by the Isabelle process if document preparation is enabled; \\
      \texttt{isatool latex} & universal {\LaTeX} tool wrapper invoked multiple times
        by \texttt{isatool document}; also useful for manual experiments; \\
    \end{tabular}
    \caption{The tool chain of Isabelle session presentation}
    \label{fig:session-tools}
  \end{center}
\end{figure}


\section{Generating theory browser information} \label{sec:info}
\index{theory browsing information|bold}

As a side-effect of running a logic sessions, Isabelle is able to generate
theory browsing information, including HTML documents that show a theory's
definition, the theorems proved in its ML file and the relationship with its
ancestors and descendants.  Besides the HTML file that is generated for every
theory, Isabelle stores links to all theories in an index file. These indexes
are linked with other indexes to represent the overall tree structure of logic
sessions.

Isabelle also generates graph files that represent the theory hierarchy of a
logic.  There is a graph browser Java applet embedded in the generated HTML
pages, and also a stand-alone application that allows browsing theory graphs
without having to start a WWW client first.  The latter version also includes
features such as generating Postscript files, which are not available in the
applet version.  See \S\ref{sec:browse} for further information.

\medskip

The easiest way to let Isabelle generate theory browsing information for
existing sessions is to append ``\texttt{-i true}'' to the
\settdx{ISABELLE_USEDIR_OPTIONS} before invoking \texttt{isatool make} (or
\texttt{./build} in the distribution).  For example, add something like this
to your Isabelle settings file
\begin{ttbox}
ISABELLE_USEDIR_OPTIONS="-i true"
\end{ttbox}
and then change into the \texttt{src/FOL} directory of the Isabelle
distribution and run \texttt{isatool make}, or even \texttt{isatool make all}.
The presentation output will appear in \texttt{\$ISABELLE_BROWSER_INFO/FOL},
which usually refers to \verb,~/isabelle/browser_info/FOL,.  Note that option
\texttt{-v true} will make the internal runs of \texttt{usedir} more explicit
about such details.

Many standard Isabelle sessions (such as \texttt{HOL/ex}) also provide actual
printable documents.  These are prepared automatically as well if enabled like
this, using the \texttt{-d} option
\begin{ttbox}
ISABELLE_USEDIR_OPTIONS="-i true -d dvi"
\end{ttbox}
Enabling options \texttt{-i} and \texttt{-d} simultaneausly as shown above
causes an appropriate ``document'' link to be included in the HTML index.
Documents (or raw document sources) may be generated independently of browser
information as well, see \S\ref{sec:tool-document} for further details.

\bigskip The theory browsing information is stored in a sub-directory
directory determined by the \settdx{ISABELLE_BROWSER_INFO} setting plus a
prefix corresponding to the session identifier (according to the tree
structure of sub-sessions by default).  A complete WWW view of all standard
object-logics and examples of the Isabelle distribution is available at the
Cambridge or Munich Isabelle sites:
\begin{center}\small
  \begin{tabular}{l}
    \url{http://www.cl.cam.ac.uk/Research/HVG/Isabelle/library/} \\
    \url{http://isabelle.in.tum.de/library/} \\
  \end{tabular}
\end{center}

\medskip In order to present your own theories on the web, simply copy the
corresponding subdirectory from \texttt{ISABELLE_BROWSER_INFO} to your WWW
server, having generated browser info like this:
\begin{ttbox}
isatool usedir -i true HOL Foo
\end{ttbox}
This assumes that directory \texttt{Foo} contains some \texttt{ROOT.ML} file
to load all your theories, and HOL is your parent logic image (\texttt{isatool
  mkdir} assists in setting up Isabelle session directories, see
\S\ref{sec:tool-mkdir}).  Theory browser information for HOL should have been
generated already beforehand.  Alternatively, one may specify an external link
to an existing body of HTML data by giving \texttt{usedir} a \texttt{-P}
option like this:
\begin{ttbox}
isatool usedir -i true -P http://isabelle.in.tum.de/library/ HOL Foo
\end{ttbox}

\medskip For production use, the \texttt{usedir} tool is usually invoked in an
appropriate \texttt{IsaMakefile}, via the Isabelle \texttt{make} utility.
There is a separate \texttt{mkdir} tool to provide easy setup of all this,
with only minimal manual editing required.
\begin{ttbox}
isatool mkdir HOL Foo && isatool make
\end{ttbox}
See \S\ref{sec:tool-mkdir} for more information on preparing Isabelle session
directories, including the setup for documents.


\section{Browsing theory graphs} \label{sec:browse}
\index{theory graph browser|bold} 

The Isabelle graph browser is a general tool for visualizing dependency
graphs.  Certain nodes of the graph (i.e.~theories) can be grouped together in
``directories'', whose contents may be hidden, thus enabling the user to
collapse irrelevant portions of information.  The browser is written in Java,
it can be used both as a stand-alone application and as an applet.  Note that
the option \texttt{-g} of \texttt{isatool usedir} (see
\S\ref{sec:tool-usedir}) creates graph presentations in batch mode for
inclusion in session documents.


\subsection{Invoking the graph browser}

The stand-alone version of the graph browser is wrapped up as an
Isabelle tool called \tooldx{browser}:
\begin{ttbox}
Usage: browser [OPTIONS] [GRAPHFILE]

  Options are:
    -d           delete file after use
    -o FILE      output to FILE (ps, eps, pdf)
\end{ttbox}
When no filename is specified, the browser automatically changes to the
directory \texttt{ISABELLE_BROWSER_INFO}.

\medskip The \texttt{-d} option causes the source file (!)\ to be deleted
after the browser terminates; this is mainly intended for detaching
interactive graph views from a running Isabelle session.

The \texttt{-o} option indicates batch-mode operation, with the output written
to the indicated file; note that \texttt{pdf} produces an \texttt{eps} copy as
well.

\medskip The applet version of the browser is part of the standard WWW theory
presentation, see the link ``theory dependencies'' within each session index.


\subsection{Using the graph browser}

The browser's main window, which is shown in figure
\ref{fig:browserwindow}, consists of two sub-windows: In the left
sub-window, the directory tree is displayed. The graph itself is
displayed in the right sub-window.
\begin{figure}[ht]
  \includegraphics[width=\textwidth]{browser_screenshot}
  \caption{\label{fig:browserwindow} Browser main window}
\end{figure}


\subsubsection*{The directory tree window}

We describe the usage of the directory browser and the meaning of the
different items in the browser window.
\begin{itemize}
  
\item A red arrow before a directory name indicates that the directory
  is currently ``folded'', i.e.~the nodes in this directory are
  collapsed to one single node. In the right sub-window, the names of
  nodes corresponding to folded directories are enclosed in square
  brackets and displayed in red color.
  
\item A green downward arrow before a directory name indicates that
  the directory is currently ``unfolded''. It can be folded by
  clicking on the directory name.  Clicking on the name for a second
  time unfolds the directory again.  Alternatively, a directory can
  also be unfolded by clicking on the corresponding node in the right
  sub-window.
  
\item Blue arrows stand before ordinary node names. When clicking on such a
  name (i.e.\ that of a theory), the graph display window focuses to the
  corresponding node. Double clicking invokes a text viewer window in which
  the contents of the theory file are displayed.

\end{itemize}


\subsubsection*{The graph display window}

When pointing on an ordinary node, an upward and a downward arrow is
shown.  Initially, both of these arrows are green. Clicking on the
upward or downward arrow collapses all predecessor or successor nodes,
respectively. The arrow's color then changes to red, indicating that
the predecessor or successor nodes are currently collapsed. The node
corresponding to the collapsed nodes has the name ``{\tt [....]}''. To
uncollapse the nodes again, simply click on the red arrow or on the
node with the name ``{\tt [....]}''. Similar to the directory browser,
the contents of theory files can be displayed by double clicking on
the corresponding node.


\subsubsection*{The ``File'' menu}

Please note that due to Java security restrictions this menu is not
available in the applet version. The meaning of the menu items is as
follows:
\begin{description}
  
\item[Open \dots] Open a new graph file.
  
\item[Export to PostScript] Outputs the current graph in Postscript format,
  appropriately scaled to fit on one single sheet of A4 paper.  The resulting
  file can be printed directly.
  
\item[Export to EPS] Outputs the current graph in Encapsulated Postscript
  format. The resulting file can be included in other documents.

\item[Quit] Quit the graph browser.

\end{description}


\subsection*{*Syntax of graph definition files}

A graph definition file has the following syntax:
\begin{eqnarray*}
  \mbox{\it graph} & = & \{ \: \mbox{\it vertex \tt ;} \: \} ^ + \\
  vertex & = & \mbox{\it vertexname} \: \mbox{\it vertexID} \: \mbox{\it dirname} \: [ \mbox{\tt +} ]
  \: \mbox{\it path} \: [ \mbox{\tt <} | \mbox{\tt >} ] \: \{ \: \mbox{\it vertexID} \: \} ^ *
\end{eqnarray*}

The meaning of the items in a vertex description is as follows:
\begin{description}
  
\item[vertexname] The name of the vertex.
  
\item[vertexID] The vertex identifier. Note that there may be two
  vertices with equal names, whereas identifiers must be unique.
  
\item[dirname] The name of the ``directory'' the vertex should be
  placed in.  A ``{\tt +}'' sign after {\it dirname} indicates that
  the nodes in the directory are initially visible. Directories are
  initially invisible by default.
  
\item[path] The path of the corresponding theory file. This is
  specified relatively to the path of the graph definition file.
  
\item[List of successor/predecessor nodes] A ``{\tt <}'' sign before
  the list means that successor nodes are listed, a ``{\tt >}'' sign
  means that predecessor nodes are listed. If neither ``{\tt <}'' nor
  ``{\tt >}'' is found, the browser assumes that successor nodes are
  listed.

\end{description}


\section{Creating Isabelle session directories --- \texttt{isatool mkdir}}
\label{sec:tool-mkdir}

The \tooldx{mkdir} utility prepares Isabelle session source directories,
including a sensible default setup of \texttt{IsaMakefile}, \texttt{ROOT.ML},
and a \texttt{document} directory with a minimal \texttt{root.tex} that is
sufficient to print all theories of the session (in the order of appearance);
see \S\ref{sec:tool-document} for further information on Isabelle document
preparation.  The usage of \texttt{isatool mkdir} is:
\begin{ttbox}
Usage: mkdir [OPTIONS] [LOGIC] NAME

  Options are:
    -I FILE      alternative IsaMakefile output
    -P           include parent logic target
    -b           setup build mode (session outputs heap image)
    -q           quiet mode

  Prepare session directory, including IsaMakefile and document source,
  with parent LOGIC (default ISABELLE_LOGIC=\$ISABELLE_LOGIC)
\end{ttbox}

The \texttt{mkdir} tool is conservative in the sense that any existing
\texttt{IsaMakefile} etc.\ is left unchanged.  Thus it is safe to invoke it
multiple times, although later runs may not have the desired effect.

Note that \texttt{mkdir} is unable to change \texttt{IsaMakefile}
incrementally --- manual changes are required for multiple sub-sessions.  On
order to get an initial working session, the only editing needed is to add
appropriate \texttt{use_thy} calls to the generated \texttt{ROOT.ML} file.


\subsection*{Options}

The \texttt{-I} option specifies an alternative to \texttt{IsaMakefile} for
dependencies.  Note that ``\texttt{-}'' refers to \emph{stdout}, i.e.\ 
``\texttt{-I-}'' provides an easy way to peek at \texttt{mkdir}'s idea of
\texttt{make} setup required for some particular of Isabelle session.

\medskip The \texttt{-P} option includes a target for the parent
\texttt{LOGIC} session in the generated \texttt{IsaMakefile}.  The
corresponding sources are assumed to be located within the Isabelle
distribution.

\medskip The \texttt{-b} option sets up the current directory as the base for
a new session that provides an actual logic image, as opposed to one that only
runs several theories based on an existing image.  Note that in the latter
case, everything except \texttt{IsaMakefile} would be placed into a separate
directory \texttt{NAME}, rather than the current one.  See
\S\ref{sec:tool-usedir} for further information on \emph{build mode} vs.\ 
\emph{example mode} of the \texttt{usedir} utility.

\medskip The \texttt{-q} enables quiet mode, suppressing further notes on how
to proceed.


\subsection*{Examples}

The standard setup of a single ``example session'' based on the default logic,
with proper document generation is generated like this:
\begin{ttbox}
isatool mkdir Foo && isatool make
\end{ttbox}
\noindent The theory sources should be put into the \texttt{Foo} directory, and its
\texttt{ROOT.ML} should be edited to load all required theories.  Invoking
\texttt{isatool make} again would run the whole session, generating browser
information and the document automatically.  The \texttt{IsaMakefile} is
typically tuned manually later, e.g.\ adding source dependencies, or changing
the options passed to \texttt{usedir}.

\medskip Large projects may demand further sessions, potentially with separate
logic images being created.  This usually requires manual editing of the
generated \texttt{IsaMakefile}, which is meant to cover all of the sub-session
directories at the same time (this is the deeper reasong why
\texttt{IsaMakefile} is not made part of the initial session directory created
by \texttt{isatool mkdir}).  See \texttt{src/HOL/IsaMakefile} of the Isabelle
distribution for a full-blown example.


\section{Running Isabelle sessions --- \texttt{isatool usedir}} \label{sec:tool-usedir}

The \tooldx{usedir} utility builds object-logic images, or runs example
sessions based on existing logics. Its usage is:
\begin{ttbox}

Usage: usedir [OPTIONS] LOGIC NAME

  Options are:
    -D PATH      dump generated document sources into PATH
    -P PATH      set path for remote theory browsing information
    -b           build mode (output heap image, using current dir)
    -c BOOL      tell ML system to compress output image (default true)
    -d FORMAT    build document as FORMAT (default false)
    -g BOOL      generate session graph image for document (default false)
    -i BOOL      generate theory browser information (default false)
    -m MODE      add print mode for output
    -p LEVEL     set level of detail for proof objects
    -r           reset session path
    -s NAME      override session NAME
    -v BOOL      be verbose (default false)

  Build object-logic or run examples. Also creates browsing
  information (HTML etc.) according to settings.

  ISABELLE_USEDIR_OPTIONS=
\end{ttbox}

Note that the value of the \settdx{ISABELLE_USEDIR_OPTIONS} setting is
implicitly prefixed to \emph{any} \texttt{usedir} call. Since the
\ttindex{IsaMakefile}s of all object-logics distributed with Isabelle just
invoke \texttt{usedir} for the real work, one may control compilation options
globally via above variable. In particular, generation of \rmindex{HTML}
browsing information and document preparation is controlled here.


\subsection*{Options}

Basically, there are two different modes of operation: \emph{build mode}
(enabled through the \texttt{-b} option) and \emph{example mode} (default).

Calling \texttt{usedir} with \texttt{-b} runs \texttt{isabelle} with input
image \texttt{LOGIC} and output to \texttt{NAME}, as provided on the command
line. This will be a batch session, running \texttt{ROOT.ML} from the current
directory and then quitting.  It is assumed that \texttt{ROOT.ML} contains all
{\ML} commands required to build the logic.

In example mode, \texttt{usedir} runs a read-only session of \texttt{LOGIC}
and automatically runs \texttt{ROOT.ML} from within directory \texttt{NAME}.
It assumes that this file contains appropriate {\ML} commands to run the
desired examples.

\medskip The \texttt{-i} option controls theory browser data generation. It
may be explicitly turned on or off --- as usual, the last occurrence of
\texttt{-i} on the command line wins.

The \texttt{-P} option specifies a path (or actual URL) to be prefixed to any
\emph{non-local} reference of existing theories.  Thus user sessions may
easily link to existing Isabelle libraries already present on the WWW.

The \texttt{-m} options specifies additional print modes to be activated
temporarily while the session is processed.

\medskip The \texttt{-d} option controls document preparation.  Valid
arguments are \texttt{false} (do not prepare any document; this is default),
or any of \texttt{dvi}, \texttt{dvi.gz}, \texttt{ps}, \texttt{ps.gz},
\texttt{pdf}.  The logic session has to provide a properly setup
\texttt{document} directory.  See \S\ref{sec:tool-document} and
\S\ref{sec:tool-latex} for more details.

The \texttt{-g} option produces images of the theory dependency graph (cf.\ 
\S\ref{sec:browse}) for inclusion in the generated document, both as
\texttt{session_graph.eps} and \texttt{session_graph.pdf} at the same time.
To include this in the final {\LaTeX} document one could say
\verb,\includegraphics{session_graph}, in \texttt{document/root.tex} (omitting
the file-name extension enables {\LaTeX} to select to correct version, either
for the DVI or PDF output path).

\medskip The \texttt{-D} option causes the generated document sources
(including the user's template of \texttt{document/root.tex} etc.) to be
dumped at location \texttt{PATH}; this path is relative to the session's main
directory.  For example, \texttt{isatool usedir -D generated HOL Foo} will
produces a complete set of document sources at \texttt{Foo/generated}.
Subsequent invocation of \texttt{isatool document Foo/generated} (see also
\S\ref{sec:tool-document}) will process the final result independently of an
Isabelle job.  This decoupled mode of operation facilitates debugging of
serious {\LaTeX} errors, for example.

\medskip The \texttt{-p} option determines the level of detail for internal
proof objects, see also the \emph{Isabelle Reference
  Manual}~\cite{isabelle-ref}.

\medskip The \texttt{-v} option causes additional information to be printed
while running the session, notably the location of prepared documents.

\medskip Any \texttt{usedir} session is named by some \emph{session
  identifier}. These accumulate, documenting the way sessions depend on
others. For example, consider \texttt{Pure/FOL/ex}, which refers to the
examples of FOL, which in turn is built upon Pure.

The current session's identifier is by default just the base name of the
\texttt{LOGIC} argument (in build mode), or of the \texttt{NAME} argument (in
example mode). This may be overridden explicitly via the \texttt{-s} option.


\subsection*{Examples}

Refer to the \texttt{IsaMakefile}s of the Isabelle distribution's
object-logics as a model for your own developments.  For example, see
\texttt{src/FOL/IsaMakefile}.  The Isabelle \texttt{mkdir} tool (see
\S\ref{sec:tool-mkdir}) creates \texttt{IsaMakefile}s with proper invocation
of \texttt{usedir} as well.


\section{Preparing Isabelle session documents --- \texttt{isatool document}}
\label{sec:tool-document}

The \tooldx{document} utility prepares logic session documents, processing the
sources both as provided by the user and generated by Isabelle.  Its usage is:
\begin{ttbox}
Usage: document [OPTIONS] [DIR]

  Options are:
    -c           cleanup -- be aggressive in removing old stuff
    -o FORMAT    specify output format: dvi (default), dvi.gz, ps,
                 ps.gz, pdf

  Prepare the theory session document in DIR (default 'document')
  producing the specified output format.
\end{ttbox}
This tool is usually run automatically as part of the corresponding Isabelle
batch process, provided document preparation has been enabled (cf.\ the
\texttt{-d} option of the \texttt{usedir} utility, \S\ref{sec:tool-usedir}).
It may be manually invoked on the generated browser information document
output as well, e.g.\ in case of errors encountered in the batch run.

\medskip Document preparation requires a properly setup ``\texttt{document}''
directory within the logic session sources.  This directory is supposed to
contain all the files needed to produce the final document --- apart from the
actual theories which are generated by Isabelle.

\medskip For most practical purposes, the \texttt{document} tool is smart
enough to create any of the specified output formats, taking \texttt{root.tex}
supplied by the user as a starting point.  This even includes multiple runs of
{\LaTeX} to accommodate references and bibliographies (the latter assumes
\texttt{root.bib} within the same directory).

In more complex situations, a separate \texttt{IsaMakefile} for the document
sources may be given instead.  This should provide targets for any admissible
document format; these have to produce corresponding output files named after
\texttt{root} as well, e.g.\ \texttt{root.dvi} for target format \texttt{dvi}.

\medskip When running the session, Isabelle copies the original
\texttt{document} directory into its proper place within
\texttt{ISABELLE_BROWSER_INFO} according to the session path.  Then, for any
processed theory $A$ some {\LaTeX} source is generated and put there as
$A$\texttt{.tex}.  Furthermore, a list of all generated theory files is put
into \texttt{session.tex}.  Typically, the root {\LaTeX} file provided by the
user would include \texttt{session.tex} to get a document containing all the
theories.

The {\LaTeX} versions of the theories require some macros defined in
\texttt{isabelle.sty} as distributed with Isabelle.  Doing
\verb,\usepackage{isabelle}, in \texttt{root.tex} should be fine; the
underlying Isabelle \texttt{latex} utility already includes an appropriate
{\TeX} inputs path.

If the text contains any references to Isabelle symbols (such as
\verb,\<forall>,) then \texttt{isabellesym.sty} should be included as well.
This package contains a standard set of {\LaTeX} macro definitions
\verb,\isasym,$foo$ corresponding to \verb,\<,$foo$\verb,>, (see
Appendix~\ref{app:symbols} for a complete list of predefined Isabelle
symbols).  Users may invent further symbols as well, just by providing
{\LaTeX} macros in a similar fashion as in \texttt{isabellesym.sty} of the
distribution.

For proper setup of PDF documents (with hyperlinks, bookmarks, and thumbnail
images), we recommend to include \verb,pdfsetup.sty, as well.  It is safe to
do so even without using PDF~\LaTeX.

\medskip As a final step of document preparation within Isabelle,
\texttt{isatool document -c} is run on the resulting \texttt{document}
directory.  Thus the actual output document is built and installed in its
proper place (as linked by the session's \texttt{index.html} if option
\texttt{-i} of \texttt{usedir} has been enabled, cf.\ \S\ref{sec:info}).  The
generated sources are deleted after successful run of {\LaTeX} and friends.
Note that a separate copy of the sources may be retained by passing an option
\texttt{-D} to the \texttt{usedir} utility when running the session (see also
\S\ref{sec:tool-usedir}).


\section{Running {\LaTeX} within the Isabelle environment --- \texttt{isatool latex}}
\label{sec:tool-latex}

The \tooldx{latex} utility provides the basic interface for Isabelle document
preparation.  Its usage is:
\begin{ttbox}
Usage: latex [OPTIONS] [FILE]

  Options are:
    -o FORMAT    specify output format: dvi (default), dvi.gz, ps,
                 ps.gz, pdf, bbl, png, sty

  Run LaTeX (and related tools) on FILE (default root.tex),
  producing the specified output format.
\end{ttbox}
Appropriate {\LaTeX}-related programs are run on the input file, according to
the given output format: \texttt{latex}, \texttt{pdflatex}, \texttt{dvips},
\texttt{bibtex} (for \texttt{bbl}), and \texttt{thumbpdf} (for \texttt{png}).
The actual commands are determined from the settings environment
(\texttt{ISABELLE_LATEX} etc., see \S\ref{sec:settings}).

The \texttt{sty} output format causes the Isabelle style files to be updated
from the distribution.  This is useful in special situations where the
document sources are to be processed another time by separate tools (cf.\ 
option \texttt{-D} of the \texttt{usedir} utility, see
\S\ref{sec:tool-usedir}).


\subsubsection*{Examples}

Invoking \texttt{isatool latex} by hand may be occasionally useful when
debugging failed attempts of the automatic document preparation stage of
batch-mode Isabelle.  The abortive process leaves the sources at a certain
place within \texttt{ISABELLE_BROWSER_INFO}, see the runtime error message for
details.  This enables users to inspect {\LaTeX} runs in further detail, e.g.\ 
like this:

\begin{ttbox}
  cd ~/isabelle/browser_info/HOL/Test/document
  isatool latex -o pdf
\end{ttbox}


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