Study On XML Data Management Key Techniques Under Weaving Multi-documents

With the rapid development of Internet technology, XML data have relied on its owncharacteristics and unique technical advantages, since the W3C proposed in1998, and soonbecame one of the standards of Internet data storage and conversion. Relying on the strongfeatures of traditional object-oriented modeling techniques, the object-oriented technology isintroduced into the XML to enhance modeling capabilities for XML schema languages. Buttraditional object-oriented technology is more and more can·t satisfy the requirement of theXML application modeling capabilities, therefore, for this kind of actual situation to proposethe introduction of aspect-oriented technology.In this paper, for the deficiency of the XML document definitions extend the XMLelements have to modify the original elements, analyzes the problem of low efficiency of thecoding and the query when expand the node under the multi-documents, proposes a method ofdefining the XML document and the three-dimensional coding scheme applied tomulti-documents environment and the corresponding structural join algorithm, studied the keytechnologies of XML data management under weaving multi-documents, this paper·s mainwork includes: by aspect-oriented techniques, introduced the concept of weaving in the XMLdocument definitions, achieved the expansion of XML Schema, the crosscutting concernswoven into object-oriented systems, described a mechanism for developers to crosscuttingconcerns, achieved the crosscutting concerns of modularization, made developers can throughthe definition of aspect to weave, modify, or delete the corresponding access point, andspecified the corresponding crosscutting concerns for processing, formed a new documentmodel of transverse association between an object, improved the modularity and portability ofthe document definitions; this paper proposes a new dynamic coding scheme thethree-dimensional XML coding based on cone, on the basis of the static coding scheme isextended, can effectively support the XML document update, at the same time under thecondition of the document is not updated with good performance. Solved the coding efficiencyis low and the system cost is high caused by the entire XML tree need to re-encode when thedocument updates, and solved the problems such as the time and space overhead of thetraditional dynamic coding scheme; because of the introduction of aspect-oriented thought, therefore, on the basis of analysis and comparison of the existing structural join algorithm,based on merging thought to solve structural join under multi-documents, proposes a structuraljoin algorithm is suitable under multi-documents, and can further reduce the cost ofconnection scanning by weaving document properties or index.Finally, the related experiment is designed and implemented to verify the effectivenessand feasibility of the document definition methods, the coding scheme and the correspondingstructural join algorithms proposed by this paper.