Google’s John Mueller answered if there’s a benefit to using structured data that’s outside of what’s recommended by Google’s developer pages. Mueller responded it could, in some cases, benefit a site for SEO.
But he also cautioned against going too far with it.
Can Extra Structured Data Help SEO?
Google’s developer pages recommend a limited amount of structured data for the purpose of helping publishers attain rich results. But Google only recommends a small amount of the available structured data because the developer page content is limited to the use case of rich results.
There is a great deal of structured data that Google’s developer pages do not discuss but is nevertheless available.
Google doesn’t discuss it because there is no rich result associated with it.
For example, below is the structured data to describe two people playing the Angry Birds game:
// John played angry birds with Steve.
“name”: “Angry Birds.”
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The above structured data seems frivolous. But according to John Mueller, Google could still use these kind of non-documented structured data types unders specific circumstances.
Here is the question asked in a Webmaster Hangout:
“…if there is some schema markup on Schema.org website but it’s not listing on the Google Developer Guide, can I benefit in any way in SEO specifically?”
Non-Recommended Structured Data Can Help
Mueller answered that structured data that’s not documented in the developer pages can benefit a site. But only when it helped Google understand the content