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The range of data that can be marked up is interesting:
significantLinks - The most significant URLs on the page. Typically, these are the non-navigation links that are clicked on the most.
I guess there's more to how they decide to use data from one site but not from another.
While we don't guarantee that we will always use this information, we will check your site for marked-up content when we crawl it.
Seems like God's gift to scrapers if you ask me.
If there is an error in the code, will it show that there's an error or will it just ignore the snippet (which is what I experience with the second block on my pages that contains ratings)?