measuring schema.org impact

Hi, this may be a question more coming from my ignorance.

the assumption behind schema.org is that if I publish my data using
schema.org then it will be more discoverable by google? or is it that
google will be able to identify some specific facets that fully describe
the entity being published (a la infobox), or both?

Say that I publish a large dataset with schema.org. then, how do I measure
that

1) the effort pays off (more visits? hits to a web page?)
2) that it has been crawled by google
3) the impact that using schema.org improved something





-- 
Alexander Garcia
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