[rules-users] Using JBoss Rules for implementing "sparse" lookup tables

Hi, I am thinking of using JBoss Rules for implementing "sparse" lookup tables, e.g. suppose I have a lookup table which contains data like this: PostalCodeOrZIP StateOrProvince Country DistanceFromNorthPole 07645 NJ USA 1200 - NJ USA 1100 - - USA 1000 - Ontario CA 600 - - CA 500 The objective is to find a best matching row in the table, given PostalCodeOrZIP, StateorProvince and Country and return DistanceFromNorthPole. Another variation is just try to find a matching row in the table and return true if row is found. Note that some records may have fields with omitted values, e.g. if we know ZIP code, then we dont need to know state. Also we may have incomplete data, e.g. for some countries there will be only one row for the entire country, and some countries may not have any rows. Very important requirement is that the lookup table may grow up to 100K rows. It looks like this objective can be easily accomplished by translating the lookup table into a rule set with a rule per row in the table and then use pattern matching of JBoss Rules for matching the rows. My only concerns is that such implementation may consume too much memory, considering that I will need to build ruleset with 100K rules. Could somebody let me know whether using JBoss Rule for this task is a good idea and give some ideas on optimizing memory consumption. Thanks, Alex