First I want to say thank you for the Graphene theme. It has proven to be fun to work with and professional in its appearance and design. I am fairly new to the many ways to work with it.
I recently installed a new plugin. The instructions with the plugin allow for various selections one of which is the use of Schema.org and Microdata. There is a warning that comes with the plugin that says the theme it's being used with must be HTML5 ready to use this feature. I have hunted everywhere I can think of and I can find anything that says the theme is HTML5 compliant. Is the current version of the Graphene theme HTML 5 compliant?
I am trying to markup my code to help Google+ to find the correct image to display when I post a link on Google+ to our blog. I can't see how I can revise our child theme by changing the header.php for the markup. If I made the changes there they would appear on every post made on Google+ the same way. With my limit knowledge the plugin seems the easiest way to go.
Other ideas are appreciated. Thank you in advance for your help.