Motivation and Problem restatement

1) Motivation: 

From previous analysis, we can know time-line is very useful in commercial tools. 

However In MSE, temporal relations are expressed in hypergraph. So if transformation

from hypergraph to time-line can be achieved,it will make MSE more perfect and practical.

2) problem restatement:

In hypergraph Every node has one property: interval(maybe not specified , we use some 

default value when we are computing time axis value from hypergraph)

however in time line model, each node has : begin time and end time;

So the problem is from hypergraph we have , to assign each terminal node in hypergraph time

value. If we propose one algorithm. The input and output should be:

Input: hypergraph ( nodes, synchronization links, attachment links ,annotation links)

Output: Time value assigned to each terminal node in hypergraph.