Hi Rene,
As you can see I made a slightly different topology using a multipoint or non-broadcast network for OSPF. Please let me know if I am on the right track of understanding this 
I know that type 3 is inter-area summary routes that have tag O IA when you do show IP route on r1 to see routes advertised by r5.
rtr1#sh IP route ospf | s IA
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
O IA 10.1.0.2/32 [110/10] via 10.0.0.2, 00:24:51, Ethernet0/0
O IA 10.1.0.3/32 [110/10] via 10.0.0.3, 00:25:11, Ethernet0/0
O IA 10.1.0.4/32 [110/10] via 10.0.0.4, 00:25:01, Ethernet0/0
O IA 10.1.0.12/32 [110/20] via 10.0.0.4, 00:24:38, Ethernet0/0
[110/20] via 10.0.0.3, 00:25:11, Ethernet0/0
[110/20] via 10.0.0.2, 00:24:48, Ethernet0/0
12.0.0.0/32 is subnetted, 1 subnets
O IA 12.12.12.12 [110/21] via 10.0.0.4, 00:24:38, Ethernet0/0
[110/21] via 10.0.0.3, 00:25:11, Ethernet0/0
[110/21] via 10.0.0.2, 00:24:48, Ethernet0/0
rtr1#sh ip ospf database | b Summary
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.1.0.2 2.2.2.2 1750 0x80000001 0x00AA7D
10.1.0.2 3.3.3.3 1693 0x80000001 0x00F029
10.1.0.2 4.4.4.4 1701 0x80000001 0x00D243
10.1.0.3 2.2.2.2 1701 0x80000001 0x000518
10.1.0.3 3.3.3.3 1745 0x80000001 0x0082A0
10.1.0.3 4.4.4.4 1721 0x80000001 0x00C84C
10.1.0.4 2.2.2.2 1701 0x80000001 0x00FA21
10.1.0.4 3.3.3.3 1723 0x80000001 0x00DC3B
10.1.0.4 4.4.4.4 1745 0x80000001 0x005AC3
10.1.0.12 2.2.2.2 1701 0x80000001 0x00AA69
10.1.0.12 3.3.3.3 1723 0x80000001 0x008C83
10.1.0.12 4.4.4.4 1690 0x80000002 0x006C9E
12.12.12.12 2.2.2.2 1701 0x80000001 0x009168
12.12.12.12 3.3.3.3 1723 0x80000001 0x007382
12.12.12.12 4.4.4.4 1691 0x80000002 0x00539D
*** I know that this prefixes/routes/network/subnets come from area 1 since I define it as such…
*** Now if I do the show ip ospf database asbr-summary on the ABR r2,r3 and r4
rtr2#sh ip ospf database asbr-summary
OSPF Router with ID (2.2.2.2) (Process ID 1)
Summary ASB Link States (Area 0)
LS age: 61
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 2.2.2.2
LS Seq Number: 80000001
Checksum: 0x7980
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
LS age: 62
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x5B9A
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
LS age: 64
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x3DB4
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
rtr3#sh ip ospf database asbr-summary
OSPF Router with ID (3.3.3.3) (Process ID 1)
Summary ASB Link States (Area 0)
LS age: 77
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 2.2.2.2
LS Seq Number: 80000001
Checksum: 0x7980
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
LS age: 76
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x5B9A
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
LS age: 78
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x3DB4
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
rtr4#sh ip ospf database asbr-summary
OSPF Router with ID (4.4.4.4) (Process ID 1)
Summary ASB Link States (Area 0)
LS age: 83
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 2.2.2.2
LS Seq Number: 80000001
Checksum: 0x7980
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
LS age: 83
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x5B9A
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
LS age: 82
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 12.12.12.12 (AS Boundary Router address)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x3DB4
Length: 28
Network Mask: /0
MTID: 0 Metric: 10
*** I can see it in the sh ip ospf database as well
rtr2#sh ip ospf database | b Summary ASB
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
12.12.12.12 2.2.2.2 1807 0x80000005 0x007184
12.12.12.12 3.3.3.3 1808 0x80000005 0x00539E
12.12.12.12 4.4.4.4 56 0x80000006 0x0033B9
rtr3#sh ip ospf database | b Summary ASB
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
12.12.12.12 2.2.2.2 1860 0x80000005 0x007184
12.12.12.12 3.3.3.3 1859 0x80000005 0x00539E
12.12.12.12 4.4.4.4 108 0x80000006 0x0033B9
rtr4#sh ip ospf database | b Summary ASB
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
12.12.12.12 2.2.2.2 1403 0x80000005 0x007184
12.12.12.12 3.3.3.3 1404 0x80000005 0x00539E
12.12.12.12 4.4.4.4 1664 0x80000005 0x0035B8
Am I right in my analysis?
Thanks so much,