A digital object can be thought of as just more than just one single image. It can actually become a complex structure in its own right, even growing to the point of having its own hierarchical structure.
There are two types of digital objects within Oracle that could be classified as NULL.
A NULL value can have numerous meanings, but in the relational world, a NULL value is one which is unknown and not just blank. A number that is NULL can be considered to be zero, but a true NULL value is one that is unknown and has the potential to be any value.
When it comes to dealing with objects, an object can be created and just given the value NULL.
myimage ORDSYS.ORDIMAGE … begin myimage := NULL;
An object can also be initialized as a composite, meaning its object structure is set up. As an object can be composed of multiple types, the initializing involves setting up the individual values.
myimage ORDSYS.ORDIMAGE … begin myimage := ORDSYS.ORDIMAGE...