[rules-users] Querying for a particular object from working memory

Hi, Is there a way to query for an object of type X among a pool of objects of type X in working memory that have the maximum/minimum value of a particular attribute a1 ? For example if I have a class C Class C { int a1; int a2; } As part of my rules evaluataion I have N instances of C inserted into working memory c1,c2.....cn. Now I would like to query for the object that the max value of attribute a1 Is this possible? Thanks Jai