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<div class="section" id="simpy-history">
<h1>SimPy History<a class="headerlink" href="#simpy-history" title="Permalink to this headline">¶</a></h1>
<p>SimPy is based on ideas from Simula and Simscript but uses standard
Python. It combines two previous packages, SiPy, in Simula-Style
(Klaus Muller) and SimPy, in Simscript style (Tony Vignaux and
Chang Chui)</p>
<p>SimPy is based on efficient implementation of co-routines using
Python’s generators capability.</p>
<p>The package has been hosted on Sourceforge.net since 15 September 2002.
Sourceforge.net’s service has always been outstanding. It is essential to
the SimPy project! Thanks, all you people at SourceForge!</p>
<div class="section" id="december-2011-release-2-3">
<h2>December 2011: Release 2.3<a class="headerlink" href="#december-2011-release-2-3" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Support for Python 3.x has been added</li>
<li>Examples and tutorials modified to run on Python 2.6 and up
including Python 3.</li>
<li>Examples can now be executed via py.test so we can make sure they do run.</li>
<li>The documentation has had some reorganisation. The index has had
work done on it. The Simple manual has been pulled out and is setup
as a separate manual.</li>
</ul>
</div>
<div class="section" id="september-2011-release-2-2b1">
<h2>September 2011: Release 2.2b1<a class="headerlink" href="#september-2011-release-2-2b1" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>The Unit tests have been rewritten.</li>
<li>The directory sturcture of the release has been simplified</li>
<li>The documentation has had some minor changes</li>
</ul>
</div>
<div class="section" id="may-2010-version-2-1-0">
<h2>May 2010: Version 2.1.0<a class="headerlink" href="#may-2010-version-2-1-0" title="Permalink to this headline">¶</a></h2>
<p>A major release of SimPy, with a new code base, a (small) number of
additions to the API, and added documentation.</p>
<div class="section" id="additions">
<h3>Additions<a class="headerlink" href="#additions" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>A function <cite>step</cite> has been added to the API. When called, it executes
the next scheduled event. (<cite>step</cite> is actually a method of Simulation.)</li>
<li>Another new function is <cite>peek</cite>. It returns the time of the next event.
By using <cite>peek</cite> and <cite>step</cite> together, one can easily write e.g. an
interactive program to step through a simulation event by event.</li>
<li>A simple interactive debugger <tt class="docutils literal"><span class="pre">stepping.py</span></tt> has been added. It allows
stepping through a simulation, with options to skip to a certain time,
skip to the next event of a given process, or viewing the event list.</li>
<li>Versions of the Bank tutorials (documents and programs) using the advanced
object-oriented API have been added.</li>
<li>A new document describes tools for gaining insight into and debugging SimPy
models.</li>
</ul>
</div>
<div class="section" id="changes">
<h3>Changes<a class="headerlink" href="#changes" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>Major re-structuring of SimPy code, resulting in much less
SimPy code – great for the maintainers.</li>
<li>Checks have been added which test whether entities belong to the
same <cite>Simulation</cite> instance.</li>
<li>The <cite>Monitor</cite> and <cite>Tally</cite> methods <cite>timeAverage</cite> and <cite>timeVariance</cite>
now calculate only with the observed time-series. No value is
assumed for the period prior to the first observation.</li>
<li>Changed class <cite>Lister</cite> so that circular references between
objects no longer lead to stack overflow and crash.</li>
</ul>
</div>
<div class="section" id="repairs">
<h3>Repairs<a class="headerlink" href="#repairs" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>Functions <cite>allEventNotices</cite> and <cite>allEventTimes</cite> are working again.</li>
<li>Error messages for methods in SimPy.Lib work again.</li>
</ul>
</div>
</div>
<div class="section" id="april-2009-release-2-0-1">
<h2>April 2009: Release 2.0.1<a class="headerlink" href="#april-2009-release-2-0-1" title="Permalink to this headline">¶</a></h2>
<p>A bug-fix release of SimPy 2.0</p>
</div>
<div class="section" id="october-2008-version-2-0">
<h2>October 2008: Version 2.0<a class="headerlink" href="#october-2008-version-2-0" title="Permalink to this headline">¶</a></h2>
<p>This is a major release with changes to the SimPy application programming
interface (API) and the formatting of the documentation.</p>
<div class="section" id="api-changes">
<h3>API changes<a class="headerlink" href="#api-changes" title="Permalink to this headline">¶</a></h3>
<p>In addition to its existing API, SimPy now also has an object oriented API.
The additional API</p>
<ul class="simple">
<li>allows running SimPy in parallel on multiple processors or multi-core CPUs,</li>
<li>supports better structuring of SimPy programs,</li>
<li>allows subclassing of class <em>Simulation</em> and thus provides users with
the capability of creating new simulation modes/libraries like SimulationTrace, and</li>
<li>reduces the total amount of SimPy code, thereby making it easier to maintain.</li>
</ul>
<p>Note that the OO API is <strong>in addition</strong> to the old API. SimPy 2.0 is fully
backward compatible.</p>
</div>
<div class="section" id="documentation-format-changes">
<h3>Documentation format changes<a class="headerlink" href="#documentation-format-changes" title="Permalink to this headline">¶</a></h3>
<p>SimPy’s documentation has been restructured and processed by the Sphinx
documentation generation tool. This has generated one coherent, well
structured document which can be easily browsed. A seach capability is included.</p>
</div>
</div>
<div class="section" id="march-2008-version-1-9-1">
<h2>March 2008: Version 1.9.1<a class="headerlink" href="#march-2008-version-1-9-1" title="Permalink to this headline">¶</a></h2>
<p>This is a bug-fix release which cures the following bugs:</p>
<ul class="simple">
<li>Excessive production of circular garbage, due to a circular reference
between Process instances and event notices. This led to large memory
requirements.</li>
<li>Runtime error for preempts of proceeses holding multiple Resource objects.</li>
</ul>
<p>It also adds a Short Manual, describing only the basic facilities of SimPy.</p>
</div>
<div class="section" id="december-2007-version-1-9">
<h2>December 2007: Version 1.9<a class="headerlink" href="#december-2007-version-1-9" title="Permalink to this headline">¶</a></h2>
<p>This is a major release with added functionality/new user API calls and bug fixes.</p>
<div class="section" id="major-changes">
<h3>Major changes<a class="headerlink" href="#major-changes" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>The event list handling has been changed to improve the runtime performance
of large SimPy models (models with thousands of processes). The use of
dictionaries for timestamps has been stopped. Thanks are due to Prof.
Norm Matloff and a team of his students who did a study on improving
SimPy performance. This was one of their recommendations. Thanks, Norm and guys!
Furthermore, in version 1.9 the ‘heapq’ sorting package replaces ‘bisect’.
Finally, cancelling events no longer removes them, but rather marks them.
When their event time comes, they are ignored. This was Tony Vignaux’ idea!</li>
<li>The Manual has been edited and given an easier-to-read layout.</li>
<li>The Bank2 tutorial has been extended by models which use more advanced
SimPy commands/constructs.</li>
</ul>
</div>
<div class="section" id="bug-fixes">
<h3>Bug fixes<a class="headerlink" href="#bug-fixes" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>The tracing of ‘activate’ statements has been enabled.</li>
</ul>
</div>
<div class="section" id="id1">
<h3>Additions<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>A method returning the time-weighted variance of observations
has been added to classes Monitor and Tally.</li>
<li>A shortcut activation method called “start” has been added
to class Process.</li>
</ul>
</div>
</div>
<div class="section" id="january-2007-version-1-8">
<h2>January 2007: Version 1.8<a class="headerlink" href="#january-2007-version-1-8" title="Permalink to this headline">¶</a></h2>
<div class="section" id="id2">
<h3>Major Changes<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>SimPy 1.8 and future releases will not run under the obsolete
Python 2.2 version. They require Python 2.3 or later.</li>
<li>The Manual has been thoroughly edited, restructured and rewritten.
It is now also provided in PDF format.</li>
<li>The Cheatsheet has been totally rewritten in a tabular format.
It is provided in both XLS (MS Excel spreadsheet) and PDF format.</li>
<li>The version of SimPy.Simulation(RT/Trace/Step) is now accessible
by the variable ‘version’.</li>
<li>The <em>__str__</em> method of Histogram was changed to return a table format.</li>
</ul>
</div>
<div class="section" id="id3">
<h3>Bug fixes<a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>Repaired a bug in <em>yield waituntil</em> runtime code.</li>
<li>Introduced check for <em>capacity</em> parameter of a Level or a Store
being a number > 0.</li>
<li>Added code so that self.eventsFired gets set correctly after an event fires
in a compound yield get/put with a waitevent clause (reneging case).</li>
<li>Repaired a bug in prettyprinting of Store objects.</li>
</ul>
</div>
<div class="section" id="id4">
<h3>Additions<a class="headerlink" href="#id4" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>New compound yield statements support time-out or event-based
reneging in get and put operations on Store and Level instances.</li>
<li><em>yield get</em> on a Store instance can now have a filter function.</li>
<li>All Monitor and Tally instances are automatically registered in list
<em>allMonitors</em> and <em>allTallies</em>, respectively.</li>
<li>The new function <em>startCollection</em> allows activation of Monitors and
Tallies at a specified time.</li>
<li>A <em>printHistogram</em> method was added to Tally and Monitor which generates
a table-form histogram.</li>
<li>In SimPy.SimulationRT: A function for allowing changing
the ratio wall clock time to simulation time has been added.</li>
</ul>
</div>
</div>
<div class="section" id="june-2006-version-1-7-1">
<h2>June 2006: Version 1.7.1<a class="headerlink" href="#june-2006-version-1-7-1" title="Permalink to this headline">¶</a></h2>
<p>This is a maintenance release. The API has not been changed/added to.</p>
<ul class="simple">
<li>Repair of a bug in the _get methods of Store and Level which could lead to synchronization problems
(blocking of producer processes, despite space being available in the buffer).</li>
<li>Repair of Level __init__ method to allow initialBuffered to be of either float or int type.</li>
<li>Addition of type test for Level get parameter ‘nrToGet’ to limit it to positive
int or float.</li>
<li>To improve pretty-printed output of ‘Level’ objects, changed attribute
‘_nrBuffered’ to ‘nrBuffered’ (synonym for ‘amount’ property).</li>
<li>To improve pretty-printed output of ‘Store’ objects, added attribute
‘buffered’ (which refers to ‘_theBuffer’ attribute).</li>
</ul>
</div>
<div class="section" id="february-2006-version-1-7">
<h2>February 2006: Version 1.7<a class="headerlink" href="#february-2006-version-1-7" title="Permalink to this headline">¶</a></h2>
<p>This is a major release.</p>
<ul class="simple">
<li>Addition of an abstract class Buffer, with two sub-classes <em>Store</em> and <em>Level</em>
Buffers are used for modelling inter-process synchronization in producer/
consumer and multi-process cooperation scenarios.</li>
<li>Addition of two new <em>yield</em> statements:<ul>
<li><em>yield put</em> for putting items into a buffer, and</li>
<li><em>yield get</em> for getting items from a buffer.</li>
</ul>
</li>
<li>The Manual has undergone a major re-write/edit.</li>
<li>All scripts have been restructured for compatibility with IronPython 1 beta2.
This was doen by moving all <em>import</em> statements to the beginning of the scripts.
After the removal of the first (shebang) line, all scripts (with the exception
of plotting and GUI scripts) can run successfully under this new Python
implementation.</li>
</ul>
</div>
<div class="section" id="september-2005-version-1-6-1">
<h2>September 2005: Version 1.6.1<a class="headerlink" href="#september-2005-version-1-6-1" title="Permalink to this headline">¶</a></h2>
<p>This is a minor release.</p>
<ul class="simple">
<li>Addition of Tally data collection class as alternative
to Monitor. It is intended for collecting very large data sets
more efficiently in storage space and time than Monitor.</li>
<li>Change of Resource to work with Tally (new Resource
API is backwards-compatible with 1.6).</li>
<li>Addition of function setHistogram to class Monitor for initializing
histograms.</li>
<li>New function allEventNotices() for debugging/teaching purposes. It returns
a prettyprinted string with event times and names of process instances.</li>
<li>Addition of function allEventTimes (returns event times of all scheduled
events).</li>
</ul>
</div>
<div class="section" id="june-2005-version-1-6">
<h2>15 June 2005: Version 1.6<a class="headerlink" href="#june-2005-version-1-6" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Addition of two compound yield statement forms to support the modelling of
processes reneging from resource queues.</li>
<li>Addition of two test/demo files showing the use of the new reneging statements.</li>
<li>Addition of test for prior simulation initialization in method activate().</li>
<li>Repair of bug in monitoring thw waitQ of a resource when preemption occurs.</li>
<li>Major restructuring/editing to Manual and Cheatsheet.</li>
</ul>
</div>
<div class="section" id="february-2005-version-1-5-1">
<h2>1 February 2005: Version 1.5.1<a class="headerlink" href="#february-2005-version-1-5-1" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">MAJOR LICENSE CHANGE:</p>
<blockquote>
<div><p>Starting with this version 1.5.1, SimPy is being release under the GNU
Lesser General Public License (LGPL), instead of the GNU GPL. This change
has been made to encourage commercial firms to use SimPy in for-profit
work.</p>
</div></blockquote>
</li>
<li><p class="first">Minor re-release</p>
</li>
<li><p class="first">No additional/changed functionality</p>
</li>
<li><p class="first">Includes unit test file’MonitorTest.py’ which had been accidentally deleted
from 1.5</p>
</li>
<li><p class="first">Provides updated version of ‘Bank.html’ tutorial.</p>
</li>
<li><p class="first">Provides an additional tutorial (‘Bank2.html’) which shows
how to use the new synchronization constructs introduced in SimPy 1.5.</p>
</li>
<li><p class="first">More logical, cleaner version numbering in files.</p>
</li>
</ul>
</div>
<div class="section" id="december-2004-version-1-5">
<h2>1 December 2004: Version 1.5<a class="headerlink" href="#december-2004-version-1-5" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>No new functionality/API changes relative to 1.5 alpha</li>
<li>Repaired bug related to waiting/queuing for multiple events</li>
<li>SimulationRT: Improved synchronization with wallclock time on Unix/Linux</li>
</ul>
</div>
<div class="section" id="september-2004-version-1-5alpha">
<h2>25 September 2004: Version 1.5alpha<a class="headerlink" href="#september-2004-version-1-5alpha" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">New functionality/API additions</p>
<blockquote>
<div><ul class="simple">
<li>SimEvents and signalling synchronization constructs, with ‘yield waitevent’ and ‘yield queueevent’ commands.</li>
<li>A general “wait until” synchronization construct, with the ‘yield waituntil’ command.</li>
</ul>
</div></blockquote>
</li>
<li><p class="first">No changes to 1.4.x API, i.e., existing code will work as before.</p>
</li>
</ul>
</div>
<div class="section" id="may-2004-version-1-4-2">
<h2>19 May 2004: Version 1.4.2<a class="headerlink" href="#may-2004-version-1-4-2" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Sub-release to repair two bugs:</p>
<blockquote>
<div><ul class="simple">
<li>The unittest for monitored Resource queues does not fail anymore.</li>
<li>SimulationTrace now works correctly with “yield hold,self” form.</li>
</ul>
</div></blockquote>
</li>
<li><p class="first">No functional or API changes</p>
</li>
</ul>
</div>
<div class="section" id="february-2004-version-1-4-1">
<h2>29 February 2004: Version 1.4.1<a class="headerlink" href="#february-2004-version-1-4-1" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Sub-release to repair two bugs:</p>
<blockquote>
<div><ul class="simple">
<li>The (optional) monitoring of the activeQ in Resource now works correctly.</li>
<li>The “cellphone.py” example is now implemented correctly.</li>
</ul>
</div></blockquote>
</li>
<li><p class="first">No functional or API changes</p>
</li>
</ul>
</div>
<div class="section" id="february-2004-version-1-4-published-on-sourceforge">
<h2>1 February 2004: Version 1.4 published on SourceForge<a class="headerlink" href="#february-2004-version-1-4-published-on-sourceforge" title="Permalink to this headline">¶</a></h2>
</div>
<div class="section" id="december-2003-version-1-4-alpha">
<h2>22 December 2003: Version 1.4 alpha<a class="headerlink" href="#december-2003-version-1-4-alpha" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">New functionality/API changes</p>
<blockquote>
<div><blockquote>
<div><ul class="simple">
<li>All classes in the SimPy API are now new style classes, i.e., they inherit from <em>object</em> either directly or indirectly.</li>
<li>Module <em>Monitor.py</em> has been merged into module <em>Simulation.py</em> and all <em>SimulationXXX.py</em> modules. Import of <em>Simulation</em> or any <em>SimulationXXX</em> module now also imports <em>Monitor</em>.</li>
<li>Some <em>Monitor</em> methods/attributes have changed. See Manual!</li>
<li><em>Monitor</em> now inherits from <em>list</em>.</li>
</ul>
</div></blockquote>
<ul class="simple">
<li>A class <em>Histogram</em> has been added to <em>Simulation.py</em> and all <em>SimulationXXX.py</em> modules.</li>
<li>A module <em>SimulationRT</em> has been added which allows synchronization between simulated and wallclock time.</li>
<li>A moduleSimulationStep which allows the execution of a simulation model event-by-event, with the facility to execute application code after each event.</li>
<li>A Tk/Tkinter-based module <em>SimGUI</em> has been added which provides a SimPy GUI framework.</li>
<li>A Tk/Tkinter-based module <em>SimPlot</em> has been added which provides for plot output from SimPy programs.</li>
</ul>
</div></blockquote>
</li>
</ul>
</div>
<div class="section" id="june-2003-version-1-3">
<h2>22 June 2003: Version 1.3<a class="headerlink" href="#june-2003-version-1-3" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>No functional or API changes</li>
<li>Reduction of sourcecode linelength in Simulation.py to <= 80 characters</li>
</ul>
</div>
<div class="section" id="june-2003-version-1-3-alpha">
<h2>9 June 2003: Version 1.3 alpha<a class="headerlink" href="#june-2003-version-1-3-alpha" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Significantly improved performance</p>
</li>
<li><p class="first">Significant increase in number of quasi-parallel processes SimPy can handle</p>
</li>
<li><p class="first">New functionality/API changes:</p>
<blockquote>
<div><ul class="simple">
<li>Addition of SimulationTrace, an event trace utility</li>
<li>Addition of Lister, a prettyprinter for instance attributes</li>
<li>No API changes</li>
</ul>
</div></blockquote>
</li>
<li><p class="first">Internal changes:</p>
<blockquote>
<div><ul class="simple">
<li>Implementation of a proposal by Simon Frost: storing the keys of the event set dictionary in a binary search tree using bisect. Thank you, Simon! SimPy 1.3 is dedicated to you!</li>
</ul>
</div></blockquote>
</li>
<li><p class="first">Update of Manual to address tracing.</p>
</li>
<li><p class="first">Update of Interfacing doc to address output visualization using Scientific Python gplt package.</p>
</li>
</ul>
</div>
<div class="section" id="april-2003-version-1-2">
<h2>29 April 2003: Version 1.2<a class="headerlink" href="#april-2003-version-1-2" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">No changes in API.</p>
</li>
<li><dl class="first docutils">
<dt>Internal changes:</dt>
<dd><ul class="first last simple">
<li>Defined “True” and “False” in Simulation.py to support Python 2.2.</li>
</ul>
</dd>
</dl>
</li>
</ul>
</div>
<div class="section" id="october-2002">
<h2>22 October 2002:<a class="headerlink" href="#october-2002" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Re-release of 0.5 Beta on SourceForge.net to replace corrupted file __init__.py.</li>
<li>No code changes whatever!</li>
</ul>
</div>
<div class="section" id="id5">
<h2>18 October 2002:<a class="headerlink" href="#id5" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Version 0.5 Beta-release, intended to get testing by application developers and system integrators in preparation of first full (production) release. Released on SourceForge.net on 20 October 2002.</p>
</li>
<li><p class="first">More models</p>
</li>
<li><p class="first">Documentation enhanced by a manual, a tutorial (“The Bank”) and installation instructions.</p>
</li>
<li><p class="first">Major changes to the API:</p>
<ul>
<li><p class="first">Introduced ‘simulate(until=0)’ instead of ‘scheduler(till=0)’. Left ‘scheduler()’ in for backward compatibility, but marked as deprecated.</p>
</li>
<li><p class="first">Added attribute “name” to class Process. Process constructor is now:</p>
<div class="highlight-python"><pre>def __init__(self,name="a_process")</pre>
</div>
<p>Backward compatible if keyword parameters used.</p>
</li>
<li><p class="first">Changed Resource constructor to:</p>
<div class="highlight-python"><pre>def __init__(self,capacity=1,name="a_resource",unitName="units")</pre>
</div>
<p>Backward compatible if keyword parameters used.</p>
</li>
</ul>
</li>
</ul>
</div>
<div class="section" id="september-2002">
<h2>27 September 2002:<a class="headerlink" href="#september-2002" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Version 0.2 Alpha-release, intended to attract feedback from users</li>
<li>Extended list of models</li>
<li>Upodated documentation</li>
</ul>
</div>
<div class="section" id="id6">
<h2>17 September 2002<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Version 0.1.2 published on SourceForge; fully working, pre-alpha code</li>
<li>Implements simulation, shared resources with queuing (FIFO), and monitors for data gathering/analysis.</li>
<li>Contains basic documentation (cheatsheet) and simulation models for test and demonstration.</li>
</ul>
</div>
</div>
</div>
</div>
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<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">SimPy History</a><ul>
<li><a class="reference internal" href="#december-2011-release-2-3">December 2011: Release 2.3</a></li>
<li><a class="reference internal" href="#september-2011-release-2-2b1">September 2011: Release 2.2b1</a></li>
<li><a class="reference internal" href="#may-2010-version-2-1-0">May 2010: Version 2.1.0</a><ul>
<li><a class="reference internal" href="#additions">Additions</a></li>
<li><a class="reference internal" href="#changes">Changes</a></li>
<li><a class="reference internal" href="#repairs">Repairs</a></li>
</ul>
</li>
<li><a class="reference internal" href="#april-2009-release-2-0-1">April 2009: Release 2.0.1</a></li>
<li><a class="reference internal" href="#october-2008-version-2-0">October 2008: Version 2.0</a><ul>
<li><a class="reference internal" href="#api-changes">API changes</a></li>
<li><a class="reference internal" href="#documentation-format-changes">Documentation format changes</a></li>
</ul>
</li>
<li><a class="reference internal" href="#march-2008-version-1-9-1">March 2008: Version 1.9.1</a></li>
<li><a class="reference internal" href="#december-2007-version-1-9">December 2007: Version 1.9</a><ul>
<li><a class="reference internal" href="#major-changes">Major changes</a></li>
<li><a class="reference internal" href="#bug-fixes">Bug fixes</a></li>
<li><a class="reference internal" href="#id1">Additions</a></li>
</ul>
</li>
<li><a class="reference internal" href="#january-2007-version-1-8">January 2007: Version 1.8</a><ul>
<li><a class="reference internal" href="#id2">Major Changes</a></li>
<li><a class="reference internal" href="#id3">Bug fixes</a></li>
<li><a class="reference internal" href="#id4">Additions</a></li>
</ul>
</li>
<li><a class="reference internal" href="#june-2006-version-1-7-1">June 2006: Version 1.7.1</a></li>
<li><a class="reference internal" href="#february-2006-version-1-7">February 2006: Version 1.7</a></li>
<li><a class="reference internal" href="#september-2005-version-1-6-1">September 2005: Version 1.6.1</a></li>
<li><a class="reference internal" href="#june-2005-version-1-6">15 June 2005: Version 1.6</a></li>
<li><a class="reference internal" href="#february-2005-version-1-5-1">1 February 2005: Version 1.5.1</a></li>
<li><a class="reference internal" href="#december-2004-version-1-5">1 December 2004: Version 1.5</a></li>
<li><a class="reference internal" href="#september-2004-version-1-5alpha">25 September 2004: Version 1.5alpha</a></li>
<li><a class="reference internal" href="#may-2004-version-1-4-2">19 May 2004: Version 1.4.2</a></li>
<li><a class="reference internal" href="#february-2004-version-1-4-1">29 February 2004: Version 1.4.1</a></li>
<li><a class="reference internal" href="#february-2004-version-1-4-published-on-sourceforge">1 February 2004: Version 1.4 published on SourceForge</a></li>
<li><a class="reference internal" href="#december-2003-version-1-4-alpha">22 December 2003: Version 1.4 alpha</a></li>
<li><a class="reference internal" href="#june-2003-version-1-3">22 June 2003: Version 1.3</a></li>
<li><a class="reference internal" href="#june-2003-version-1-3-alpha">9 June 2003: Version 1.3 alpha</a></li>
<li><a class="reference internal" href="#april-2003-version-1-2">29 April 2003: Version 1.2</a></li>
<li><a class="reference internal" href="#october-2002">22 October 2002:</a></li>
<li><a class="reference internal" href="#id5">18 October 2002:</a></li>
<li><a class="reference internal" href="#september-2002">27 September 2002:</a></li>
<li><a class="reference internal" href="#id6">17 September 2002</a></li>
</ul>
</li>
</ul>
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