Online compression algorithms for multiple SETS?

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Algorithms like LZW and others compress data sequences. What I'm looking is an algorithm that compress multiple Sets. if possible online algorithm. For example :

 1,2,3,4,5
 2,8,7,5,4
 3,1,8,9,7
 2,4,5,8,7

becomes :

 Rule1 : 2,4,5
 Rule2: 8,7
 Rule3 : 3,1
 Rule4 : R1,R2

 R1,R3
 R1,R2
 R2,R3,9 
 R4

also we can have cases where Rules are hierarchical .. which will be better compression... this is one example of compression .. i'm looking for online algorithm.

The hard thing is to do compression on the fly ... and be optimal i.e. maximize compression.

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