With XML standards playing more and more important role at information exchanges in data management,the XML database storing strategy which supports huge amount XML data control from bottom layer of database hasbecome...With XML standards playing more and more important role at information exchanges in data management,the XML database storing strategy which supports huge amount XML data control from bottom layer of database hasbecome the key part of fields such as content management. This article proposes an efficiently XML storing strategyfrom the perspective of constraint schema of XML instance based on XML Schema path analysis.展开更多
According to the analysis of existing complicated functional dependencies constraint, we conclude the conditions of defining functional dependency in XML, and then we introduce the concept of the node value equality. ...According to the analysis of existing complicated functional dependencies constraint, we conclude the conditions of defining functional dependency in XML, and then we introduce the concept of the node value equality. A new path language and a new definition of functional dependencies in XML （XFD） are proposed XFD includes the relative XFD and the absolute XFD, in which absolute key and relative key are the particular cases. We focus on the logical implication and the closure problems, and propose a group of inference rules. Finally, some proofs of the correctness and completeness are given. XFD is powerful on expressing functional dependencies in XML causing data redundancy, and has a complete axiom system.展开更多
文摘With XML standards playing more and more important role at information exchanges in data management,the XML database storing strategy which supports huge amount XML data control from bottom layer of database hasbecome the key part of fields such as content management. This article proposes an efficiently XML storing strategyfrom the perspective of constraint schema of XML instance based on XML Schema path analysis.
基金Supported by the National Natural Science Foundation of China (60573089)the National High Technology Research and Development Program of China (2006AA09Z139)
文摘According to the analysis of existing complicated functional dependencies constraint, we conclude the conditions of defining functional dependency in XML, and then we introduce the concept of the node value equality. A new path language and a new definition of functional dependencies in XML （XFD） are proposed XFD includes the relative XFD and the absolute XFD, in which absolute key and relative key are the particular cases. We focus on the logical implication and the closure problems, and propose a group of inference rules. Finally, some proofs of the correctness and completeness are given. XFD is powerful on expressing functional dependencies in XML causing data redundancy, and has a complete axiom system.
