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Their approach also uses the Dewey encoding for node identifiers in their indexes.
The drawbacks of the Dewey encoding are significant: updates to the labels require linear time, and the size of the labels is also linear to the size of the database in the worst case.
As the amount of XML data available increases, it is becoming vital to be able to not only query and maintain this information quickly, but also store it in a compact manner.
Our work is also motivated by the mobile software development at National ICT Australia and Green Pea Software, in which managing large amount of XML data on mobile devices is mandatory.
They then use bi-simulation to compress the documents that share the same sub-tree, however, they can only support node navigations in linear time.