Schema.org RDFa isn&#x27;t hidden. JSON-LD in a script tag is but that&#x27;s equivalently goofy.<p>&quot;stems from another way of thinking about metadata&quot;? Nope. It was a clumsy hack because they actually just wanted to put the &lt;rdf:RDF&gt; tags in the HTML but people would complain about HTML validation so they put it in a comment tag.