Xplain is a beautifully orthogonal database manipulation and query language. Orthogonal means that with Xplain there is usually only one solution, not dozens like in SQL. Xplain straight-forwardly supports aggregation and generalization. Or in other words, it supports HAS-A and IS-A relations, the only possible relations. Because it supports IS-A relations, it is a very natural component in an object-oriented environment. Xplain2SQL can convert Xplain data definition and data manipulation and retrieval statements to
many SQL dialects.