Within Btrieve, there is no concept for allowing multiple record schemas within a single table. Through the use of the <filters> element, a FairCom RTG user may utilize this advanced feature within c-tree, known as Multi Record Type (MRT) Tables (or "Virtual Tables"). For more information, see FairCom DB API Virtual Tables on the Technical White Papers page of the FairCom website. Please contact FairCom for details if you have use for this feature.