This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

AddThis xmlns


This plugin adds the xmlns:addthis=”” entry to the HTML tag. This head entry is required to make it Valid XHTML. More info at


  • Screenshot of the HTML tag which now includes the xmlns:addthis entry!


This section describes how to install the plugin and get it working.

  1. Delete any existing ‘mjd-addthis-xmlns’ folder from the ‘/wp-content/plugins/’ directory.
  2. Upload the ‘mjd-addthis-xmlns’ folder to the ‘/wp-content/plugins/’ directory.
  3. Activate the plugin through the ‘Plugins’ menu in WordPress.


Why do I need this plugin?

If you are using the AddThis bookmarking plugin ( )
then you need this plugin to make sure that the generated HTML by the AddThis plugin is Valid.
The plugin adds the xmlns:addthis=”” entry to the html head tag so that the custom attributes of the AddThis plugin are recognized properly.


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Contributors & Developers

“AddThis xmlns” is open source software. The following people have contributed to this plugin.


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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • Initial release.