Lore: A Database Management System for Semistructured Data. Why?. Although data may exhibit some structure it may be too varied or irregular to map to a fixed schema. Relational DBMS might use null values in this case. May be difficult to decide in advance on a specific schema.
Select xFrom A.B xWhere exists y in x.C: y = 5
Logical query plan for:Select xFrom DBGroup.Member xWhere exists y in x.Age: y<30