Entity is the name of the entity. Pubid is the public id. Notation is the notation name. Base and Pubid may be undefined. This is called for a declaration of notation.
Notation is the notation name.
Pubid is the public id. Base, Sysid, and Pubid may all be undefined. This is called when an external entity is referenced. Pubid is the public id. Base, and Pubid may be undefined.