Sequence database

Description

A sequence represents a collection of itemsets (or transactions) in a particular order. A sequence database is a collection of sequences and their sequence identifiers. An example of a geo-referenced transactional database is as follows:

SID	Items
1	{a b c d} {a d e} {a e f}
2	{a b c} {b d e} {c d e}
3	{a e f} {c d}
4	{a e f} {a c d} {c e}

Rules to create a sequence database

Items in an itemset have to be seperated by a tab space.
Itemsets in a sequence are seperated using '-1' as a seperator.
Each sequence is represented as a line
The sequence identifier, sid, is not needed to create a sequence database.

Format of a sequence

                            item1<sep>item2<sep>...<sep>itemA : item1<sep>item2<sep>...<sep>itemB : item1<sep>item2<sep>...<sep>itemC
                        

Example

a b c d : a d e : a e f
a b c : b d e : c d e
a e f : c 
a e f : a c d : c e