Logical Functions

The MDX functions that are listed here indicate their return type.
IsEmpty
returns TRUE if the evaluated expression is an empty cell value. Otherwise, FALSE is returned. IsEmpty(<Value Expression>)
IS
returns TRUE if two compared objects are equivalent. Otherwise, FALSE is returned. <Object 1>IS Null<Object 1>IS <Object 2>
IsAncestor
returns TRUE if a specified member is an ancestor of another specified member. Otherwise, FALSE is returned. IsAncestor(<Member1>,<Member2>)
IsLeaf
returns TRUE if a specified member is a leaf member. Otherwise, FALSE is returned. IsLeaf(<Member>)
IsSibling
returns TRUE if a specified member is a sibling of another specified member. Otherwise, FALSE is returned. IsSibling(<Member1>,<Member2>)