[Stack-cvs] stack-1-0/lang/en/doc about_install.php,1.11,1.12

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Index: about_install.php
===================================================================
RCS file: /cvsroot/stack/stack-1-0/lang/en/doc/about_install.php,v
retrieving revision 1.11
retrieving revision 1.12
diff -C2 -d -r1.11 -r1.12
*** about_install.php	6 Feb 2006 12:33:12 -0000	1.11
--- about_install.php	29 Mar 2006 10:42:38 -0000	1.12
***************
*** 1,4 ****
  <?php
! /** 

  *
--- 1,4 ----
  <?php
! /**

  *
***************
*** 18,28 ****
  <h1>Installing STACK</h1>

! STACK is a collection of PHP scripts, which link together the 
! user, a CAS, and a database over the internet. Hence the system 
  itself requires a number of extra components.

  <h3>Platform</h3>

! The scripts currently released will run on a Linux (or unix) 
  machine or a Microsoft (Windows) platform.

--- 18,28 ----
  <h1>Installing STACK</h1>

! STACK is a collection of PHP scripts, which link together the
! user, a CAS, and a database over the internet. Hence the system
  itself requires a number of extra components.

  <h3>Platform</h3>

! The scripts currently released will run on a Linux (or unix)
  machine or a Microsoft (Windows) platform.

***************
*** 30,34 ****
  <li><b>Linux:</b> STACK has been tested on a <a href="http://fedora.redhat.com/">Fedora</a>
  based Linux system running the Apache web server.</li>
! <li><b>Microsoft:</b> STACK has been tested on Windows XP and Windows 2000 using 
  IIS and <a href="http://www.easyphp.org/">EasyPHP</a>.  EasyPHP is by far the easiest
  platform on which to install STACK.  However, EasyPHP is <font color="red">not</font>
--- 30,34 ----
  <li><b>Linux:</b> STACK has been tested on a <a href="http://fedora.redhat.com/">Fedora</a>
  based Linux system running the Apache web server.</li>
! <li><b>Microsoft:</b> STACK has been tested on Windows XP and Windows 2000 using
  IIS and <a href="http://www.easyphp.org/">EasyPHP</a>.  EasyPHP is by far the easiest
  platform on which to install STACK.  However, EasyPHP is <font color="red">not</font>
***************
*** 41,59 ****
  Regardless of which operating system used, you will need the following components.
  <ul>
! <li>A web server, such as <a href="http://www.apache.org/">Apache</a>, 
  running <a href="http://www.php.net/">PHP</a>. I have been using versions after 5.0. (There
  should be no reason why STACK will not work with version 4.4 or later, however
! some users have reported that sessions do not work.  If you can offer advice here, that would be 
  most welcome...)<br />
  Windows users could use <a href="http://www.easyphp.org/">EasyPHP</a>.</li>
! <li>You need to convex LaTeX to HTML with <a href="http://hutchinson.belmont.ma.us/tth/">TtH</a>.  
! <li>The computer algebra system <a href="http://maxima.sourceforge.net/">Maxima</a> (<a href="#cas">see below</a>). 
! Version 5.9.1 is supported.  Version 5.9.2 is the
! latest release, and is currently supported for testing only.
  (Note, for those on a Microsoft platform, the <a href="http://wxmaxima.sourceforge.net/">wxMaxima</a>
  front end is much better than that distributed with Maxima itself and is well worth installing for
  testing CAS code outside STACK)</li>
! <li>(for graphical support we have used the <a href="http://www.gnuplot.info/">GNUPLOT</a> package, version 4.0. 
! This is already supplied on Fedora 3 distributions, and comes with Maxima 5.9.1 on Windows.)
  </ul>
  Finally of course
--- 41,60 ----
  Regardless of which operating system used, you will need the following components.
  <ul>
! <li>A web server, such as <a href="http://www.apache.org/">Apache</a>,
  running <a href="http://www.php.net/">PHP</a>. I have been using versions after 5.0. (There
  should be no reason why STACK will not work with version 4.4 or later, however
! some users have reported that sessions do not work.  If you can offer advice here, that would be
  most welcome...)<br />
  Windows users could use <a href="http://www.easyphp.org/">EasyPHP</a>.</li>
! <li>You need to convex LaTeX to HTML with <a href="http://hutchinson.belmont.ma.us/tth/">TtH</a>.
! <li>The computer algebra system <a href="http://maxima.sourceforge.net/">Maxima</a> (<a href="#cas">see below</a>).
! Versions 5.9.2 and 5.9.3 are supported.  Between Version 5.9.1 and 5.9.2 Maxima became <em>
! case sensitive</em>, which is not really an incremental change!  Version 5.9.1 will not be supported
! in the future.
  (Note, for those on a Microsoft platform, the <a href="http://wxmaxima.sourceforge.net/">wxMaxima</a>
  front end is much better than that distributed with Maxima itself and is well worth installing for
  testing CAS code outside STACK)</li>
! <li>(for graphical support we have used the <a href="http://www.gnuplot.info/">GNUPLOT</a> package, version 4.0.
! This is already supplied on Fedora 3 distributions, and comes with Maxima on Windows.)
  </ul>
  Finally of course
***************
*** 62,76 ****
  </ul>

! The latest stack scripts can be obtained from the CVS on 
! <tt>sourceforge</tt>. For example, anonymous access is via

! <p><tt>cvs -z3 -d:pserver:ano...@cv...:/cvsroot/stack 
  co -P  <?php echo $stack_ver['cvsmodule'] ?> </tt></p>

  <p> Developer access can be obtained via SSH by</p>

! <p><tt>export CVS_RSH=ssh<br /> 
!  
! cvs -z3 -d:ext:</tt><em>developername</em><tt>@cvs.sourceforge.net:/cvsroot/stack co -P 
  <?php echo $stack_ver['cvsmodule'] ?> </tt></p>

--- 63,77 ----
  </ul>

! The latest stack scripts can be obtained from the CVS on
! <tt>sourceforge</tt>. For example, anonymous access is via

! <p><tt>cvs -z3 -d:pserver:ano...@cv...:/cvsroot/stack
  co -P  <?php echo $stack_ver['cvsmodule'] ?> </tt></p>

  <p> Developer access can be obtained via SSH by</p>

! <p><tt>export CVS_RSH=ssh<br />
! 
! cvs -z3 -d:ext:</tt><em>developername</em><tt>@cvs.sourceforge.net:/cvsroot/stack co -P
  <?php echo $stack_ver['cvsmodule'] ?> </tt></p>

***************
*** 82,129 ****
  <h2>Security</h2>

! WARNING! What these scripts attempt to 
! do is inherently insecure. This system is designed to 
 execute CAS code typed in by your student (or indeed an arbitrary third party)
 on your server, to create and mark mathematical questions.
! This is inherently insecure, and you 
! should be aware of the dangers. These are in addition 
! to the normal security problems associated with interactive, 
 database driven web sites.

! <p>The array 

  <pre>$stack_cas['globalForbid']</pre>

! is generated automatically and contains strings the system 
! attempts not to execute. You should look at the file 
! <tt>scripts/maxima/maximafun.php</tt> and the array distributed, 
! together with the CAS documentation, to decide which CAS commands 
! you wish to prevent from being executed on your server. This 
! list is not comprehensive, and you should make your own decisions 
 here. You have been warned!

  <h2><a href="http://www.php.net/">PHP</a></h2>

! STACK needs 
 <ul>
! <li>sessions to be enabled.</li> 
 <li>the function <tt>proc_open</tt>
 must be available to establish a connection with the external applications.</li>
 </ul>
 These are enabled by default. Apart from this
! requirement there seem to be no special PHP settings.

For mail alterts (which are not fully implemented)
! , use the <a href="http://pear.php.net/">pear 
! class</a>. For example in Linux, to install this from the 
! command line, type <tt>pear install mail</tt>, for example. 
! You will need to install, <tt>mail, NET_Socket, NET_SMTP, 
! Auth_SASL</tt>.

! You might also consider the other components of your PHP system. 
! In particular, if you are integrating STACK with a VLE (eg <a 
! href="http://moodle.org/">Moodle</a>, or <a 
! href="http://www.logicampus.com/">Logicampus</a>), then you may 
! need to have installed zlib and libpng (in that order) from 
 downloads.

--- 83,130 ----
  <h2>Security</h2>

! WARNING! What these scripts attempt to
! do is inherently insecure. This system is designed to
 execute CAS code typed in by your student (or indeed an arbitrary third party)
 on your server, to create and mark mathematical questions.
! This is inherently insecure, and you
! should be aware of the dangers. These are in addition
! to the normal security problems associated with interactive,
 database driven web sites.

! <p>The array

  <pre>$stack_cas['globalForbid']</pre>

! is generated automatically and contains strings the system
! attempts not to execute. You should look at the file
! <tt>scripts/maxima/maximafun.php</tt> and the array distributed,
! together with the CAS documentation, to decide which CAS commands
! you wish to prevent from being executed on your server. This
! list is not comprehensive, and you should make your own decisions
 here. You have been warned!

  <h2><a href="http://www.php.net/">PHP</a></h2>

! STACK needs
 <ul>
! <li>sessions to be enabled.</li>
 <li>the function <tt>proc_open</tt>
 must be available to establish a connection with the external applications.</li>
 </ul>
 These are enabled by default. Apart from this
! requirement there seem to be no special PHP settings.

For mail alterts (which are not fully implemented)
! , use the <a href="http://pear.php.net/">pear
! class</a>. For example in Linux, to install this from the
! command line, type <tt>pear install mail</tt>, for example. 
! You will need to install, <tt>mail, NET_Socket, NET_SMTP,
! Auth_SASL</tt>.

! You might also consider the other components of your PHP system.
! In particular, if you are integrating STACK with a VLE (eg <a
! href="http://moodle.org/">Moodle</a>, or <a
! href="http://www.logicampus.com/">Logicampus</a>), then you may
! need to have installed zlib and libpng (in that order) from
 downloads.

***************
*** 134,153 ****
  <h2><a href="http://www.mysql.com/">MySQL</a></h2>

! Please refer to the specific documentation for installing MySQL. 
! There are no special requirements for STACK. If you wish to 
! install STACK with an alternative database, this should be 
! possible. All the interactions with the database are contained in 
 the script <pre>$stack_root/scripts/stackDatabase.php</pre>

  <h2>Display via the LaTeX system</h2>

! The basic route to convert the output from the CAS, into a 
! form which is suitable for display has so far been to force the 
! CAS to output LaTeX, and convert this on the fly to HTML. This 
 conversion could be done in a number of ways. Support currently
! exists for <a href="http://hutchinson.belmont.ma.us/tth/">TtH</a> This is just 
! one solution to the problem of displaying mathematics on the 
! internet. TtH is a closed-source system, but the binary 
! distribution is available for download. There are no special 
 requirements.

--- 135,154 ----
  <h2><a href="http://www.mysql.com/">MySQL</a></h2>

! Please refer to the specific documentation for installing MySQL.
! There are no special requirements for STACK. If you wish to
! install STACK with an alternative database, this should be
! possible. All the interactions with the database are contained in
 the script <pre>$stack_root/scripts/stackDatabase.php</pre>

  <h2>Display via the LaTeX system</h2>

! The basic route to convert the output from the CAS, into a
! form which is suitable for display has so far been to force the
! CAS to output LaTeX, and convert this on the fly to HTML. This
 conversion could be done in a number of ways. Support currently
! exists for <a href="http://hutchinson.belmont.ma.us/tth/">TtH</a> This is just
! one solution to the problem of displaying mathematics on the
! internet. TtH is a closed-source system, but the binary
! distribution is available for download. There are no special
 requirements.

***************
*** 155,185 ****
  If you wish to do this, please contact the developers.</p>

! It would also be possible to have the CAS output MathML, and 
! convert any LaTeX in questions to MathML and HTML using a 
! converter such as TtM. While we have designed STACK with this in 
 mind, we have as yet not implemented this functionality.

  <h2><a name='cas'>The computer algebra system Maxima</a></h2>

! STACK has been designed to work with the <a 
 href="http://maxima.sourceforge.net/">Maxima</a> computer algebra
 system although it should be possible to provide support for others
! such as <a href="http://www.nongnu.org/axiom/">AXIOM</a>.

! Maxima is the preferred open source CAS. Version 5.9.1 
! is needed, to work with the 
! <a href="http://www.gnuplot.info/">GNUPLOT</a> package, for 
! graphical support. 
! STACK is yet to be tested with Maxima 5.9.2.

! Linux only: Please read the Maxima documentation 
! carefully, since this package is itself supported in a number of 
 different Lisp implementations.
 STACK has been tested only with
! maxima-exec-gcl-5.9.2-2.i386.rpm

Windows only:
! Setting the PATH in Windows can be a problem, see below for advice with this.

  <p>Note, for those on a Microsoft platform, the <a href="http://wxmaxima.sourceforge.net/">wxMaxima</a>
--- 156,183 ----
  If you wish to do this, please contact the developers.</p>

! It would also be possible to have the CAS output MathML, and
! convert any LaTeX in questions to MathML and HTML using a
! converter such as TtM. While we have designed STACK with this in
 mind, we have as yet not implemented this functionality.

  <h2><a name='cas'>The computer algebra system Maxima</a></h2>

! STACK has been designed to work with the <a
 href="http://maxima.sourceforge.net/">Maxima</a> computer algebra
 system although it should be possible to provide support for others
! such as <a href="http://www.nongnu.org/axiom/">AXIOM</a>.

! Maxima is the preferred open source CAS. Versions later than 5.9.2
! is needed.

! Linux only: Please read the Maxima documentation
! carefully, since this package is itself supported in a number of
 different Lisp implementations.
 STACK has been tested only with
! maxima-exec-gcl-5.9.2-2.i386.rpm

Windows only:
! Setting the PATH in Windows can be a problem, see below for advice with this.

  <p>Note, for those on a Microsoft platform, the <a href="http://wxmaxima.sourceforge.net/">wxMaxima</a>
***************
*** 193,208 ****
  This directory will be referred to as <tt>$stack_root</tt>.</li>

! <li>Copy the file <tt>$stack_root/stackConfig.php.dist</tt> to 
! <tt>$stack_root/stackConfig.php</tt> This file will contain all your local settings.</li>

! <li>Edit <tt>$stack_root/stackConfig.php</tt> to reflect your local 
 settings. This is the only file you should have to edit, so read carefully the
! instructions it contains.</li>

! <li>Create a directory for locally and dynamically generated files. For example, 
! <tt>/home/stack/stacklocal</tt>. Ensure the webserver can write 
 to this, and update the variable, eg
! <pre>$stack_logfiles = "/home/stack/stacklocal"; </pre> 
! in <tt>stackConfig.php</tt>.</li>

  <li>Create a directory for dynamically generated plots.  This needs to be
--- 191,206 ----
  This directory will be referred to as <tt>$stack_root</tt>.</li>

! <li>Copy the file <tt>$stack_root/stackConfig.php.dist</tt> to
! <tt>$stack_root/stackConfig.php</tt> This file will contain all your local settings.</li>

! <li>Edit <tt>$stack_root/stackConfig.php</tt> to reflect your local
 settings. This is the only file you should have to edit, so read carefully the
! instructions it contains.</li>

! <li>Create a directory for locally and dynamically generated files. For example,
! <tt>/home/stack/stacklocal</tt>. Ensure the webserver can write
 to this, and update the variable, eg
! <pre>$stack_logfiles = "/home/stack/stacklocal"; </pre>
! in <tt>stackConfig.php</tt>.</li>

<li>Create a directory for dynamically generated plots. This needs to be
***************
*** 210,215 ****
 from this directory. The default value is assumed to be
 <pre>$maximalocal['IMAGE_DIR'] = $stack_root.'/tmp/';</pre>
! ie, you need to create the directory <tt>$stack_root/tmp</tt>. 
! Ensure the webserver can write to this directory.

--- 208,213 ----
  from this directory.  The default value is assumed to be
  <pre>$maximalocal['IMAGE_DIR']     = $stack_root.'/tmp/';</pre>
! ie, you need to create the directory <tt>$stack_root/tmp</tt>.
! Ensure the webserver can write to this directory.

***************
*** 221,228 ****
 </ol>
 Create a directory for these applications, such as <tt>c:\Programe Files\bin</tt>, add this to your PATH, and copy
! the executables into this. TtH and gnuplot are single executable applications - gnuplot is distributed with Maxima 
! and is the binary file <tt>C:\Program Files\Maxima-5.9.1\bin\wgnuplot.exe</tt>

! <p> For Maxima, a batch file has been provided: 
  <tt>$stack_root/scripts/install/stackmaxima.bat</tt>.  Copy this file into a directory on your
  Windows PATH, and edit it to point to your current version of Maxima. Ensure:
--- 219,226 ----
  </ol>
  Create a directory for these applications, such as <tt>c:\Programe Files\bin</tt>, add this to your PATH, and copy
! the executables into this.  TtH and gnuplot are single executable applications - gnuplot is distributed with Maxima
! and is the binary file <tt>C:\Program Files\Maxima-5.9.3\bin\wgnuplot.exe</tt>

! <p> For Maxima, a batch file has been provided:
  <tt>$stack_root/scripts/install/stackmaxima.bat</tt>.  Copy this file into a directory on your
  Windows PATH, and edit it to point to your current version of Maxima. Ensure:
***************
*** 235,239 ****
  $stack_mysql['host']    = 'localhost';
  $stack_mysql['user']    = 'stack';
! $stack_mysql['pswd']    = '';      
  $stack_mysql['stackdb'] = 'stack';
  </pre>
--- 233,237 ----
  $stack_mysql['host']    = 'localhost';
  $stack_mysql['user']    = 'stack';
! $stack_mysql['pswd']    = '';
  $stack_mysql['stackdb'] = 'stack';
  </pre>
***************
*** 242,248 ****
  <li>
  The MySQL database is setup using the script
! <tt><a href='scripts/install/stackInstall.php'>$stack_root/scripts/install/stackInstall.php</a></tt>. 
  <p><font color="red">WARNING!</font>  This is disabled by default, for obvious reasons, and will do nothing.
! Edit the file, and comment out line 9, (ie add // to the beginning of the line). 
  When the install is complete, reinstate the line to prevent future third party execution of this script.</p>

--- 240,246 ----
  <li>
  The MySQL database is setup using the script
! <tt><a href='scripts/install/stackInstall.php'>$stack_root/scripts/install/stackInstall.php</a></tt>.
  <p><font color="red">WARNING!</font>  This is disabled by default, for obvious reasons, and will do nothing.
! Edit the file, and comment out line 9, (ie add // to the beginning of the line).
  When the install is complete, reinstate the line to prevent future third party execution of this script.</p>

***************
*** 253,257 ****
  <!-- <h3>MySQL setup</h3>

! Remember that a clean MySQL install requires you to set the root 
  password. For example,

--- 251,255 ----
  <!-- <h3>MySQL setup</h3>

! Remember that a clean MySQL install requires you to set the root
  password. For example,

***************
*** 266,273 ****
  <h3>Starting the Pool of CAS processes</h3>

! Only if you have chosen <tt>$stack_os='unix-pool';</tt>, you will need to 
! start the pool of CAS processes from the command line. 
 In order to link the pool of CAS processes with the internet it is necessary to
! run a command line PHP script.

  <ol>
--- 264,271 ----
  <h3>Starting the Pool of CAS processes</h3>

! Only if you have chosen <tt>$stack_os='unix-pool';</tt>, you will need to
! start the pool of CAS processes from the command line.
 In order to link the pool of CAS processes with the internet it is necessary to
! run a command line PHP script.

  <ol>
***************
*** 286,305 ****
  </ol>

! Everytime <tt>startsocket</tt> is executed, the file 
! <tt>$stack_root/scripts/maxima/initmaxima.php</tt> is also 
! executed once before the sockets are started. This does the 
! following.

! <ol> 

! <li>Writes the file <tt>CASkeywords.php</tt> which contains the three 
! arrays, explained in the security section below.</li>

! <li>Generates the file <tt>maximalocal.mac</tt>, which 
! contains settings from <tt>stackConfig.php</tt> in 
! a form suitable for the CAS. For example, what is the gnuplot 
 command? Where should plot files be written to? etc.</li> </ol>

! To run these scripts in the background, the unix utility 
 <a href="http://www.kuro5hin.org/story/2004/3/9/16838/14935"><tt>screen</tt></a> is useful.

--- 284,303 ----
  </ol>

! Everytime <tt>startsocket</tt> is executed, the file
! <tt>$stack_root/scripts/maxima/initmaxima.php</tt> is also
! executed once before the sockets are started. This does the
! following.

! <ol>

! <li>Writes the file <tt>CASkeywords.php</tt> which contains the three
! arrays, explained in the security section below.</li>

! <li>Generates the file <tt>maximalocal.mac</tt>, which
! contains settings from <tt>stackConfig.php</tt> in
! a form suitable for the CAS. For example, what is the gnuplot
 command? Where should plot files be written to? etc.</li> </ol>

! To run these scripts in the background, the unix utility
 <a href="http://www.kuro5hin.org/story/2004/3/9/16838/14935"><tt>screen</tt></a> is useful.

***************
*** 309,324 ****
  <h2>Ready to test!</h2>
  <p>If all the steps above were a success you should be ready to
! <?php 
  //Does this variable point to a valid web URL?
  if (isset($stack_web_url))
  {
!     echo "<a href='$stack_web_url'>test the system.</a>"; 
  }
  else
  {
!     echo "<a href='javascript:void(0)'>test the system.</a> 
!     
            <li><font color='red'>Are you sure you have moved stackConfig.php into the root as required in step 2?</font></li>";
!     
      echo '<p>Now please refresh this web page and follow the above link to test the system!';
  }
--- 307,322 ----
  <h2>Ready to test!</h2>
  <p>If all the steps above were a success you should be ready to
! <?php
  //Does this variable point to a valid web URL?
  if (isset($stack_web_url))
  {
!     echo "<a href='$stack_web_url'>test the system.</a>";
  }
  else
  {
!     echo "<a href='javascript:void(0)'>test the system.</a>
! 
            <li><font color='red'>Are you sure you have moved stackConfig.php into the root as required in step 2?</font></li>";
! 
      echo '<p>Now please refresh this web page and follow the above link to test the system!';
  }
***************
*** 327,331 ****

  <p>Note, some sample questions are distributed in the file <tt>scripts/install/sample_questions.xml</tt>
! which you can upload into stack to get you started.  You need to 
  <ol>
  <li>login as the "admin" user, </li>
--- 325,329 ----

Note, some sample questions are distributed in the file <tt>scripts/install/sample_questions.xml</tt>
! which you can upload into stack to get you started. You need to
 <ol>
 <li>login as the "admin" user, </li>
***************
*** 340,353 ****

For the Maxima CAS, the commands are divided into four groups.
! In the first three cases, the system checks to see if the entries 
! in this list are a substring of anything going to the CAS, and 
 takes the appropriate action.

! For students' input, or guest input in a CAS chat session (or 
! the like) we operate in a mode which allows only specified 
! strings. For teachers' input, we would like to enable 
! arbitrarily named functions and variables to be present, subject 
! to the naming restrictions of the CAS of course. Hence we 
! basically divide all Maxima commands into the following four 
 groups.

--- 338,351 ----

For the Maxima CAS, the commands are divided into four groups.
! In the first three cases, the system checks to see if the entries
! in this list are a substring of anything going to the CAS, and
 takes the appropriate action.

! For students' input, or guest input in a CAS chat session (or
! the like) we operate in a mode which allows only specified
! strings. For teachers' input, we would like to enable
! arbitrarily named functions and variables to be present, subject
! to the naming restrictions of the CAS of course. Hence we
! basically divide all Maxima commands into the following four
 groups.

***************
*** 358,362 ****
  <li><tt>$stack_cas['teacherNotAllow']</tt><br/>
  These commands have side effects in the Maxima environment, and hence are not allowed.  There may be
! no good reason why a command is here, but there we are.  
  </li>
  <li><tt>$stack_cas['studentAllow'] </tt><br/>
--- 356,360 ----
  <li><tt>$stack_cas['teacherNotAllow']</tt><br/>
  These commands have side effects in the Maxima environment, and hence are not allowed.  There may be
! no good reason why a command is here, but there we are.
  </li>
  <li><tt>$stack_cas['studentAllow'] </tt><br/>
***************
*** 365,374 ****
  </ol>

! These classifications are given in the file, 
! <tt>maximafun.php</tt>, which you can and should edit. Once 
! you have edited this file, you need to execute the file 
! <tt>initmaxima.php</tt> to re-create 
! <tt>CASkeywords.php</tt>. (This in turn has been generated 
! directly from the Maxima docs using another script, which you 
 need not use).

--- 363,372 ----
  </ol>

! These classifications are given in the file,
! <tt>maximafun.php</tt>, which you can and should edit. Once
! you have edited this file, you need to execute the file
! <tt>initmaxima.php</tt> to re-create
! <tt>CASkeywords.php</tt>. (This in turn has been generated
! directly from the Maxima docs using another script, which you
 need not use).