I need to add Schema.org type schema. That will involve a bunch of divs, spans and styling, and even links. Is there a way in RSD to do that?

It appears the only way to do that, is to add the html element, and then create a separate css files for the element with an outside editor, then add that css to the resources of RSD, and then link the css files.

Or, is there a way the text and links can be added as any other normal text? Then give each separate line/item an ID, and in a separate css file, add [less] code than the above solution to convert
<p>Philadelphia</p> (which has been given a unique ID in RSD)
to something that would be interpreted by crawlers as
<p itemprop="addressLocality">Philadelphia</p>

or if text is edited in the middle of a paragraph, I assume that RSD is giving it a span with its own styling class, but it would still need an ID, then
<span>Philadephia</span> to <span itemprop="addressLocality">Philadelphia</span>

So basically, is there a way in a separate css file to "insert" itemprop="addressLocality" into element so that webcrawlers will see it?

I see Scheme is implemented in the HTML Editor, but it seems to be absent in RSD. CC even has articles explaining why it should be a "top priority for 2015."

I think adding it outside the app is the best option for now. It could probably be added with an ajax call but then some others would have to be done so crawlers could see it.