Database: scholar
Question: keyphrases used by dan klein in his emnlp papers
SQL:
SELECT DISTINCT t2.keyphraseid FROM paper AS t3 JOIN paperkeyphrase AS t2 ON t3.paperid  =  t2.paperid JOIN venue AS t4 ON t4.venueid  =  t3.venueid JOIN writes AS t5 ON t5.paperid  =  t3.paperid JOIN author AS t1 ON t5.authorid  =  t1.authorid WHERE t1.authorname  =  "dan klein" AND t4.venuename  =  "emnlp";