基于时态编码和线序划分的时态XML 索引

研究了一种基于时态编码和线序划分的时态XML索引机制.首先,提出一种基于扩展先序编码的时态编码方案,通过该编码可确定结点间的结构关系；其次,在深入分析时间区间关系的基础上引入线序划分的概念,并讨论了获取线序划分的算法；然后,建立了整合路径结构信息和时态约束信息的时态结构摘要,并在此基础上建立了时态XML索引结构—TempSumIndex,同时研究了基于TempSumlndex的时态XML查询和增量式更新算法；最后,对TempSumlndex和现有时态XML索引技术的基本性能进行了详细的实验评估.实验结果表明,TempSumlndex具有更为优越的性能.

Temporal XML Index Based on Temporal Encoding and Linear Order Partition

A temporal XML indexing structure based on temporal encoding and linear order partition was studied. First,a temporal encoding method based on extended preorder encoding was proposed,by which the structural relationship between nodes can be determined.Second,based on detail analysis of relationship between time intervals,the concept of linear order partition was proposed,and algorithm to attain a linear order partition was also discussed.Then,a temporal structural summary was introduced which includes both structural and temporal information,and a temporal XML indexing mechanism—TempSumlndex was built based on temporal structural summary,then,both temporal querying and incremental updating algorithms of TempSumlndex were discussed. Finally,experiments were designed to compare the basic performance of TempSumlndex with existing temporal XML indexing methods,and the experimental results show that TempSumlndex has better performance.