OSPF non-backbone area

From: ccie2be (ccie2be@nyc.rr.com)
Date: Tue May 03 2005 - 13:36:50 GMT-3

Hi guys,
 
Why is the following topology OK?
 
r1 area 1 r2 area 0 r3 area 1 r5
                           |
                          r4
                           |
                      area 1
 
Notice that there are multiple non-contiguous area 1's.
 
Are there any limitations regarding using non-unique non-backbone areas
multiple times?
 
Or, can the same area number be used for any non-backbone area regardless of
any other topology considerations?
 
TIA, Tim

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