| 摘要 |
A DATABASE IS PROVIDED IN WHICH AN INDEX (2) FOR THE DATABASE IS PROVIDED AS A HIERARCHICAL STRUCTURE OF NODES THAT ARE NAVIGATED DURING A SEARCH UNTIL A CONCLUSION SET IS REACHED, AND THE STRUCTURE IS ORGANISED SUCH THAT KEY INFORMATION RELATING TO A NODES IS INFERRED FROM THE POSITION OF THE NODE IN THE STRUCTURE.(FIG 1)
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