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Providing efficient access for XML APIs in XML Metadata Knowledge Bases (XMKBs) is crucial, since XML is widely used to integrate data in XMKBs. In XMKBs, the types, contents and locations of heterogeneous data are illustrated in XML documents to provide a uniform interface for users to manipulate this data. As users update and query information about this heterogeneous data, the XML documents are manipulated by XML APIs (i.e., DOM APIs) to ensure consistency. Concurrency control protocols can ensure a better performance of the DOM APIs to manipulate XML documents. However, the existing protocols (i.e., traditional locking protocols and XML-based protocols) are not sufficiently adequate for DOM APIs in XMKBs.
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