1. A method comprising: automatically collecting training data from manually created semantic relations using at least one computerized device; automatically extracting rules from said training data to produce extracted rules using said computerized device; automatically characterizing existing semantic relations in said training data based on co-occurrence of said extracted rules in said existing semantic relations using said computerized device; automatically constructing semantic relation topics based on said characterizing of said existing semantic relations using said computerized device; and grouping instances of said training data into said semantic relation topics to detect new semantic relations using said computerized device.