OSPF Routing Summarization
OSPF dynamic routing should allow advertising of summarized routes. For reference Cisco's documentation refers to this behavior as "a key feature of OSPF".
As an example, 10.0.1.0/24 and 10.0.2.0/24 in area 0.0.3.1 should be able to be advertised as only a part of the larger supernet 10.0.0.0/12 to 0.0.0.0; in this way only 10.0.0.0/12 is advertised with remote routers having no concept of the smaller subnets.
What currently happens is if you add 10.0.0.0/12 to 0.0.3.1, it advertises only 10.0.1.0/24 and 10.0.2.0/24. This gets messy as internal routes get more complex and none of them need to be individually advertised.