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P33@8EFldsN ʚ;r<.ʚ;g44d4d@:A 0ppp@ <4!d!dl$ 0V<4ddddl$ 0V <4BdBdl # 0g4:d:d@:A 0p@ ppz___PPT10DjwiԚs New ķ0ķ:A 0hADTimes New Romanķ0ķ:A 0h pp___PPT9|4?- DBLABO =(.A Document-based Approach to Indexing XML Data//2Ya-Hui Chang and Tsan-Lung Hsieh Department of Computer Science National Taiwan Ocean University yahui@cs.ntou.edu.tw Sept. 10th, 2002 " dv''/''> LB 0auOverview ,XML introduction Element block Element tree Two types of index structures Document index Element index Experiment results Conclusiont   B 0  Element Block$ ,,  Element Tree$ ,, Gthe Query Processor  the Index Structures ,Purpose: Providing efficient query processing over multiple XML documents Two types: Document index Representing the correspondence of document identifiers and element values Element index Representing the positions of elements ZAZ ZZKZZ'Z  A  K  ' Document Index$,,ZBased on B+-Tree: the size of each node is restricted by order; the tree is balanced.dD  'Document Index (cont)$,Each node is represented as an XML document. Search-key value is represented as the attribute key of the element Pointer, while the document identifier is represented as the content.lZ,1?H Element IndexThe position information of elements is represented based on the order specified in DTD, or the element tree. The element indexes are partitioned into offset blocks corresponding to element blocks to capture the nesting structures of elements. It is named  offset since we keep the relative position of elements, to reduce the cost of maintenance. Offset tuples constitute the offset block: the first component records the offset to the parent element; the last component records the pointer to the offset tuple for the next sibling element; the other components record the relative positions of sub-elements. ` + =: .S@ ,dd[2Example of Offset Blocks  ^4Example of Retrieving OffsetsSuppose we plan to retrieve all the data corresponding to the path  /Books/Book/Title . Based on the element tree, Book is the first child of Books, and Title is the first child of Book. This information tells us which components to retrieve in the offset tuples of Books and Book. We also need to follow the sibling links.GD  R->_5$Example of Retrieving Offsets (cont) %Suppose the input path is  /Books/Book/Author/Lastname , where Book is the first child, Author is the second child and Lastname is the first child. We need to process the sibling elements for both Author and Book.Z  =,- B [\3Constructing AlgorithmIdea: performing a linear scan on the XML document; retrieving the absolute positions of all tags to calculate offsets. data structures used: StartTagList: the sequence of start-tags and their absolute positions EndTagList: the sequence of end-tags and their absolute positions Stack: all unfinished elements; on top is the most recent one, which is also the parent of the current element Each internal node of the element tree will need to record how many child nodes it has. BZZYZY, : I  Initial Data J!Round 1 K"Round 2 L#Round 3 M$Round 4 N%Round 5 O&Round 6 P'Round 7 Q(Round 8 R)Round 9 S*Round 10 T+Round 11 U,Round 12 V- Final Data W.Performance EvaluationComparison with DOM: showing the efficiency of utilizing the pre-built element index DOM (Document Object Model): a tree-based parsing mechanism where each element is a node Using Microsoft MSXML 3.0 DOM API Construction of the cost model: showing the scalability of our indexing scheme Comparison with Lore: showing the performance of the whole query processor Lore: a specialized database system for semi-structured/XML data `U{BG{BX/Comparison with DOM : Cost Model The I/O cost consists of processing the following four portions of data: The internal nodes of the document index The leaf nodes of the document index The offset blocks The XML files The cost model is as follows: VInInY0Experiment Setups Z1Experiment Data BQueries to Compare with LoreDExperiment Results   Conclusions ,Summary We construct a query processor to retrieve data from multiple XML documents, which utilizes two index structures: the document index could quickly identify the required document the maintainable element index could quickly determine the precise location of desired data Experiment results show the efficiency of our approach. 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P    Z*   0%     \*   6 , `P   Z*   6H0 `   \* H  0޽h ? ̙3380___PPT10.ւ0lh3 ZR0(  r  S H0    T ?? @   : 2 r  S h0   H  0޽h ? 3f3fff̙3ff̙y___PPT10Y+D=' = @B +y  p700(  x  c $ ,`N   x  c $h ,  H  0޽h ? 3f3fff̙3ff̙y___PPT10Y+D=' = @B +  Ps(  ,C H.  `P 8c??"`p   Principles of database systems Ullman Jeffrey Computer Science Press 1999 database   bO   70  ` ??"`   @  50 T ??"`m x , c $ ,` N   H , 0޽h ? 3f3fff̙3ff̙y___PPT10Y+D=' = @B +m  P$(  0x 0 c $ ,`N   J P C "A hierI-  P  f ??" &w B 0 NExample of Offset BlocksH 0 0޽h ? 3f3fff̙3ff̙y___PPT10Y+D=' = @B +R  y q 4 (  4r 4 S   ,`N    4 3 rZ " ???"`F% DDocument Index  4 3 rZ& ???"`_  C Element Index  4 3 rZ* ???"`  B XML Document    4  `. ??"` t  JIdentifying Document  4  `2 ??"`   JDetermining Position  4  `7 ??"` )  ERetrieving DataB 4 # lD??s js B 4 # lD??   B 4 # lD?? B 4 # lD?? B 4 # lD??s  s B 4 # lD??s Gs B 4 # lD??s )s  4  f= ??"` q)  ;Query 4  f@ ??"` )  <Result 4  ` Ԕ??0  H 4 0޽h ? 3333y___PPT10Y+D=' = @B +s  X*(  Px P c $G ,`N   r P S |H ,@  H P 0޽h ? 3f3fff̙3ff̙y___PPT10Y+D=' = @B +   o(  Tx T c $,V ,`N   x T c $V , 0  b T c &A  ?? %    T TX ??p@p  IOrder=5& 2"H T 0޽h ? 3f3fff̙3ff̙y___PPT10Y+D=' = @B +   0(  Xx X c $Xb ,`N   x X c $,c ,    X  `td >??"`p Y A B0001 B0002 B0001 B3.bt XML0lKP28lKP2\,1  X Z x >?? Y  DTDH X 0޽h ? 3f3fff̙3ff̙y___PPT10Y+D=' = @B +  P <$(  8r 8 S 4 ,`N   r 8 S   ,0  H 8 0޽h ? 3333s  #+"(  x  c $ ,`N      ` 8c??"`W I   f ??"`}VB tBBook1 Title1 pointer Publisher1 Date1 Keyword1 pointerCC,  # l 8c??"`9C5  PAuthor1 Lastname1 Firstname1 point Author2 Lastname2 Firstname2 nullQQ    ft ??"` 9U  q?Book2 Title2 pointer Publisher2 Date2 Keyword2 null@@   # l 8c??"` 9C  Y'Author3 Lastname3 Firstname3 null((B   ZD??CCB   `D??% 9% B @ ZD??C% B  ZD??CB  ZD?? z B   `D??8 98 B  ZD?? 8 B  ZD?? z z B   `D??  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