Advanced Applications and Structures in Xml Processing: by Changqing Li, Tok Wang Ling

By Changqing Li, Tok Wang Ling

Purposes and buildings in XML Processing: Label Streams, Semantics usage and knowledge question applied sciences displays the numerous examine effects and most modern findings of students' world wide, operating to discover and extend the function of XML. This assortment represents an realizing of XML processing applied sciences in reference to either complex functions and the newest XML processing applied sciences that's of fundamental value. It offers the chance to appreciate themes intimately and observe XML learn at a entire point.

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Extra resources for Advanced Applications and Structures in Xml Processing: Label Streams, Semantics Utilization and Data Query Technologies (Premier Reference Source)

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For example, the keys include (email, author, article, bib), (author, www, bib) etc. When the nodes are clustered based on the reversed rooted path, elements with the same tag name will be implicitly clustered as well. Therefore, this path index can also be used to answer queries such //author. bisimulation graph One of the major limitations of the above two indexes is that they cannot answer path queries with predicates. The reason is that their similarity notion is based on the current node label (tag-name index) or the label of its ancestors (rooted path).

For each page, an extra tuple (st, lo, hi) is stored, where st is the level of the last node in the previous page (st is 0 for the first page), lo and hi are the minimum and maximum levels of all nodes in that page, respectively. If all the page headers are preloaded into main memory, they can serve as a light-weight index to guess which page contains the following sibling or parent of the current node. The idea is based on the fact that if the current node U with level L has a following sibling, the page that contains this following sibling must have a character“)” with level L − 1 (this is the closing parenthesis corresponding to U).

Endfor 16. u:= Following-Sibling (u); 17. until u = NIL or S = empty set 18. = empty set and proot is a returning node then 19. remove all matches to proot in R; 20. return FALSE; 21. endif 22. , 2004). Another large body of research focuses on structural XML indexes, where XML tree nodes are clustered based on their structural similarity. To some extent, an XML index can be thought of as a special XML storage format in that it also clusters tree nodes based on certain criteria. The differences are that XML indexes are solely created for query performance and storage formats are designed for many purposes and need to trade off between different requirements.

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