joomla/joomla-platform — pull request #681 by bigbangireland (2011-12-30 09:34:42+00:00)
Title: Add ability to use any context with setMetaData & getMetaData

JDocument/setMetaData is currently limited to the name and http-equiv contexts.
http://docs.joomla.org/JDocument/setMetaData

In HTML5 the meta tag also now excepts the 'itemprop' and 'charset' contexts. Other specs such as Open Graph use custom meta tag contexts like 'property'.

To add support for these new and future uses of the meta tag, I'd like to propose making the third argument of JDocument/setMetaData a mixed value (boolean (legacy) ~ string).

*HTML5 Microdata - itemprop*
http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#the-meta-element

*Open Graph - property (Non-Valid)*
http://ogp.me/