Add bi-13 query
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+PREFIX sn: <http://www.ldbc.eu/ldbc_socialnet/1.0/data/>
+PREFIX snvoc: <http://www.ldbc.eu/ldbc_socialnet/1.0/vocabulary/>
+PREFIX sntag: <http://www.ldbc.eu/ldbc_socialnet/1.0/tag/>
+PREFIX foaf: <http://xmlns.com/foaf/0.1/>
+PREFIX dbpedia: <http://dbpedia.org/resource/>
+PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
+
+SELECT ?year ?month (GROUP_CONCAT(?strTagAndPopularity) AS ?popularTags)
+WHERE
+{
+ {
+ SELECT ?year ?month ?tagName ?strPopularity ?strTagAndPopularity
+ WHERE
+ {
+ {
+ SELECT ?year ?month ?tagName (COUNT(?message) AS ?popularity)
+ WHERE
+ {
+ BIND ("China" AS ?countryName)
+ VALUES (?type) {(snvoc:Comment) (snvoc:Post)}
+ ?message a ?type .
+ ?message snvoc:isLocatedIn/foaf:name ?countryName .
+ ?message snvoc:creationDate ?creationDate .
+ ?message snvoc:hasTag/foaf:name ?tagName .
+ BIND( YEAR(?creationDate) AS ?year)
+ BIND( MONTH(?creationDate) AS ?month)
+ }
+ GROUP BY ?year ?month ?tagName
+ ORDER BY DESC(?popularity)
+ }
+ BIND(STR(?popularity) AS ?strPopularity)
+ BIND(CONCAT("(",?tagName,",",?strPopularity,")") AS ?strTagAndPopularity)
+ }
+ }
+}
+GROUP BY ?year ?month
+ORDER BY DESC(?year) ?month
