I've got this figured out about half way. I'm trying to accomplish both adding a 1+ button to my site and adding organizational microdata for company name, address, phone number, etc
I have all the item types & item properties set correctly in the html body for organizational data. I also have the appropriate item properties in the head tag for the 1+ button snippets.
The confusing part is how to set the html tag above the head tag in my page. The Google 1+ setup page says:
<!-- Update your html tag to include the itemscope and itemtype attributes --> <html itemscope itemtype="http://schema.org/LodgingBusiness">
But in the Google forum a Contributor was saying you don't actually add the itemscope or itemtype in the html tag, but rather in the div element in the page (which I do have setup correctly). She states to add the schema.org namespace:
...in the html tag. Right now my html tag is displayed as:
Whether you use (for example) <div itemscope itemtype="http://data-vocabulary.org/Product"> or <div itemscope itemtype="http://schema.org/Product">
you do not need to place xmlns:schema="http://schema.org/" in the <html> tag. It is placed in the <div> tag as I have shown above. I cannot say I have ever seen the schema in the <html> tag. Also, I have put organizational microdata, a.k.a. Rich Snippets on several sites for both as results in SERPs and in use with Google+, and never added that.
After you get the snippet together, test it with Google's Rich Snippet Testing Tool [google.com] But do note that just because you have them, does not mean Google, or any other SE, will include them in SERPs. Google will, however, recognize it for when a person uses the Google+ button.
Also, remember that Facebook will not recognize the snippet as they use Open Graph Protocol (OGP [ogp.me]). Something you may want to consider if you have a Share/Like on facebook link. For that, you do have to add a schema to the <html> tag - xmlns: og="http://opengraphprotocol.org/schema/ Note: in the above schema, there is no space between the : and o. I had to put it there as the forum kept making a :o