By Changqing Li, Tok Wang Ling
Functions and constructions in XML Processing: Label Streams, Semantics usage and knowledge question applied sciences displays the numerous study effects and most up-to-date findings of students' around the globe, operating to discover and extend the function of XML. This assortment represents an realizing of XML processing applied sciences in reference to either complicated functions and the most recent XML processing applied sciences that's of fundamental significance. It offers the chance to appreciate themes intimately and notice XML examine at a finished point.
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Additional resources for Advanced Applications and Structures in Xml Processing: Label Streams, Semantics Utilization and Data Query Technologies (Premier Reference Source)
To some extent, this feature-based index is similar to hash-based index in that it has pruning power to eliminate a set of inputs that are guaranteed to be non-match, and then use the more expensive matching algorithm to further check the remaining set. The general framework of the feature-based index is as follows: XML Native Storage and Query Processing 1. 2. At the index creation phase: a. Compute the bisimulation graph of the XML tree. b. Enumerate all subgraphs of depth k (indexable units) in the data bisimulation graph, and compute their features.
2. 3. All XML tree nodes that are F&B bisimilar are clustered into chunks All chunks having the same path ID are clustered into fragments All fragments having the same tag names are clustered into tapes These three clustering criteria have different granularity, with the chunk being the finest and the tape being the coarsest. It is easy to see that all nodes in the same type have the same tag name and all nodes with the same tag name are clusterd into one tape. Therefore, the tape has the same clustering criterion as the tag-name index, so answering queries such as //author amounts to finding the tape who is clustered based on tag name “author”.
Since this index is a graph rather than the keyvalue pairs as in the tag-name and path indexes, it cannot be stored using the existing disk-based data structures such as the B+ tree. Fortunately since the bisimulation graph is usually much smaller than the XML tree, it is usually fully loaded into the main memory and then fed as an input to the tree pattern matching algorithm. The tree pattern matching algorithm is very similar to the one introduced in the previous section. However, the input event generation is different: previously the XML tree was traversed in depth-first order during which the begin and end events were generated for each element.
Advanced Applications and Structures in Xml Processing: Label Streams, Semantics Utilization and Data Query Technologies (Premier Reference Source) by Changqing Li, Tok Wang Ling