I wrote about this a while ago in my Joomla microdata article. It has struck me since that it was complete overkill to add authorship in that way and can be done without any code changes at all, just using the standard contacts component.
The reasoning is, that you don’t have to link each article on the site to the authors Google+ page. If there is an author page on the site, and each page is linked to the author page then you only need to add the link to the Google+ profile on that author page.
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