First, the concept, characteristics and challenges of probabilistic XML data management technology are introduced; second, probabilistic XML data and probabilistic XML data models are reviewed. The core ideas of various models come from the possible world model. By selecting child nodes and deleting nodes, an instance of a possible world can be obtained, and the sum of the probabilities of all instances is 1; finally, the conversion relationship between different models is introduced. This lays the foundation for the query and normalization theory of probabilistic XML databases.
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