@prefix md: <http://www.w3.org/ns/md#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfa: <http://www.w3.org/ns/rdfa#> .
@prefix schema: <http://schema.org/> .

<sdo_eg_md_16.html> md:item (
 [ a schema:Table;
   schema:about "list of presidents";
   schema:mainContentOfPage "true"]);
   rdfa:usesVocabulary schema: .