You can use the Microformat validator to check the semantic markup of your site to make sure that indexing robots can extract all the structured data without a problem
The validator lets you check all the most common microformats: microdata, schema.org, microformats, OpenGraph and RDF. However, not all formats support special snippets or the use of annotated data. You can find more information on how Yandex uses annotated data in our Help Sections.
More information about the validator can be found here.