First SparQL query

docs/DBPEDIA.md

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+# DBPedia
+
+## GraphIRI
+
+This is the graph identifier (URI):
+
+`http://dbpedia.org`
+
+## History of queries
+
+```SQL
+PREFIX dbo:  <http://dbpedia.org/ontology/>
+PREFIX dbp:  <http://dbpedia.org/property/>
+PREFIX dbr:  <http://dbpedia.org/resource/>
+
+SELECT ?subject, ?relationship, ?object
+WHERE {
+  ?subject ?relationship ?object .
+  {
+    SELECT ?object
+    WHERE {
+      ?m rdf:type dbo:Film .
+      ?object ?r ?m
+    }
+  }
+}
+```