Abstract: A dynamically configurable list management system that supports list elements of multiple content types is presented. Each list element is associated with an element type via an element type identifier. The element type identifier uniquely identifies the element type to the list management system. Each property associated with each element type is included in the list. Each property is identified by a unique property identifier. When adding a list element of a new element type to an existing list that does not include any elements of the new element type, the list management system identifies every property associated with the new element type. For each property associated with the new element type, the list management system determines which properties are not already included in the list, and adds those properties that are not already including to the list.