DocVersion is the content plugin to support multiple versions within a single content item.
You can select the version to display on the fly by adding a parameter to your page's URL.
This could be useful if you want to publish your software or any other versioned porducts' documentation on your Joomla! site—single document covering any of the available product versions.
Follow the normal Joomla! installation procedure. The installation package is compatible with both Joomla! 1.5 and Joomla! 1.6/1.7/2.5.
With DocVersion, you use {docversion:versiondef}{/docversion} tags to hide the parts of your article unless the version they are attached to matches the version your user requests.
The versiondef parameter can be one of the following:
To request the specific version of document, add the docver=version parameter to your article URL: http://example.com/index.php?option=com_content&view=article&id=1&Itemid=2&docver=2.0
If you omit the docver parameter, the latest version of document will be shown.