[rules-users] How to count number of facts of a type in memory?

Hi, How can I count the number of facts of a partilcuar type inserted into the rules session? lets say, I insert several instances of fact called Asset into the rules session. I need to write a web guided decision table that outputs a specifc text value in an action column based on the number of assets in memory. numberofAssets      result 1                            result12                            result23                            result3 How can I create a condition column that counts the number of Assets in memory ? question2: If I want to write a drl  that needs to count number of Assets in memory and print that value, can I use a collect from or is it only used with a Collection ? As always ,  Thank You all for your fast responses and ideas. Thanks, Ram