Comparator for groups of types

Comparator for groups of types

References

Reference NO 1

http://stackoverflow.com/questions/15197740/comparator-for-groups-of-types

Reference NO 2

https://groups.google.com/d/topic/hector-users/1mi1NIrQIjk

Reference NO 3

http://www.uwex.edu/ces/pdande/resources/pdf/agenda.pdf

Reference NO 4

http://www.datastax.com/docs/1.0/ddl/column_family

Reference NO 5

http://clinicaltrials.gov/ct2/about-studies/glossary

Reference NO 6

http://www.cochrane.org/glossary

Reference NO 7

http://docs.mongodb.org/manual/reference/operator

Reference NO 8

http://www.ema.europa.eu/ema/pages/includes/document/open_document.jsp?webContentId=WC500002925