If you look up some sites through Google (eg: Abit) you will see
headings underneath their entry in the search results.
In the case of Abit these headings are: United Kingdom, Nordics,
Canada... etc.
With other sites you might see headings for: Contact, Support,
Products, etc.
Are these headings achieved through the use of Sitemaps +, if so, what
modifications do I need to make to my sitemaps to get them?
I have already looked at the .xml schema for ideas, but so far I'm not
seeing anything that will help me with this.