| 摘要 |
A data repository stores data items with associated metadata values ( 21, 22 . . . 27 ), together with associated relatedness values ( 212, 217, 227 ) etc, defined between each pair of metadata values. In order to retrieve data, a 'most relevant' metadata value ( 21 ) is identified and data items associated with that metadata value are retrieved first. Other data items are ranked according to the relatedness value ( 217 ) of their associated metadata value ( 27 ) to the selected metadata value ( 21 ).
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