Am I allowed to have “incomplete” aggregates in DDD?

Question

DDD states that you should only ever access entities through their aggregate root. So say for instance that you have an aggregate root X which potentially has a lot of

Answer 1

You are allowed since the code will compile anyway, but if you're going for a pure DDD design you should not have incomplete instances of objects.

You should look into LazyLoading if you're afraid to load a huge object of which you will only use a small portion of its child entities.

LazyLoading delays the loading of whatever you decide to lazy-load until the moment they are accessed. They make use of callbacks to call the loading method once the code calls for them.