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How to implement supporting ontology on RDBMS Overview of some database applications with ontology supporting .Benefits of building application with ontology//(  CQuestion: How to support ontology-based semantic matching on RDBMS?DD(  #RDBMS Schema for Storing Ontologies$$$ Conventional RDBMS schema#RDBMS Schema for Storing Ontologies$$$ LRDBMS schema consisting of several system-defined tables to store ontologiesB  #RDBMS Schema for Storing Ontologies$$$ MRDBMS schema consisting of several system-defined tables to store ontologies NM B  #RDBMS Schema for Storing Ontologies$$$ Special Ontologies 2New operators for Ontology-based semantic Matching33 Overview of the new operators 2New operators for Ontology-based semantic Matching33 2ONT_RELATED Synopsis: ONT_RELATED (Term1, RelType, Term2, OntologyName) RETURNS integer; Description: Determines if the two input terms are related with respect to the special RelType relationship. Example: ONT_RELATED( X. Chen ,Fatherof OR MotherOf  Y. Chen ,  family_ontology )   E J It+ k(  2New operators for Ontology-based semantic Matching33 ONT_EXPAND Synopsis: ONT_EXPAND (Term1, RelType, Term2, OntologyName) RETURNS table; Description: Return a table(data set) that contains all the <Term1, RelType, Term2> tuples. Example: Select fatherName from TABLE(ONT_EXPAND(NULL,Fatherof, NULL,  family_ontology ))p ZZ  B N Q) ( $   2New operators for Ontology-based semantic Matching33 Two ancillary operators Synopsis: ONT_DISTANCE (NUMBER) RETURNS NUMBER; ONT_PATH(NUMBER) RETURNS VARCHAR Description: Return optimal measure (distance/path) for the filtered rows by ONT_RELATED operator. Example: Select AncestorName from family_Chen WHERE ONT_RELATED (name, Ancestorof,  Y.Chen ,  family_ontology , 123)=1 ORDER BY ONT_DISTANCE(123);nI I U b   &Question: I noticed that there are symmetry and transitivity characteristics of relationships, could they be utilized for ontology-based semantic to make it more intelligent?$ Inferencing Rules(  ~Question: I got the ideas of new operators of ontology-base semantic, but I need make more senses by real system and examples? /Implementation of New Operators on Oracle RDBMS00(Implementation of ONT_RELATED: Basic Idea: Using by an SQL query with CONNECT BY clause which is transitive closure query and supported by Oracle Implementation of ONT_EXPAND: Basic idea: Defined as a table function which includes the path and distance measure by default. bsasaExample of Restaurant Database   A Simple Case  More Complex Case More Complex Case (cont.) Question: OK, we have known that ontology-related operators can be implemented in Oracle, but those operators seem functions of searching, it must be time-consuming, could any improvement be done for the efficiency?$ <Solution for speeding up ONT_RELATED & ONT_EXPAND operations== A transitive closure table is precomputed. A new indexing schema ONT_INDEXTYPE is implemented using Oracle s Extensible Indexing Framework. c 9Performance Statistic of Ontology-based semantic matching:: Testing Environment Ontology Category: cancer ontology (consisting 25,762 terms and 54,387 relationships) RDBMS: Oracle 9i Release 2(9.2.0.3) Operating System: SunOS 5.6 Computer: Ultra60 Sparc Workstation (CPU: 450Mhz; Memory: 512MB):73f,!APerformance Statistic of Ontology-based semantic matching (Cont.)BB  "APerformance Statistic of Ontology-based semantic matching (Cont.)BB  $,Several Ontology-based Database Applications-- Homeland Security Application Supply Chain Application Life Science Application Web Service Application & & & & & %  Future work  xSupporting ontology merging. Supporting ontology evolution. 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S H 6ܠ _P   P*   H 6ؤ _   R*  H H 0޽h ? 3380___PPT10. |[  0  0(  x  c $`@ f  x  c $8a@ `    H  0޽h ? 33___PPT10i.  f+D=' = @B +    0L0 PT|(  T T S < `}<$ 0    T S < `<$ 0  H T 0޽h ? ff[[ffRR|&___PPT10.. :E+d"EXDV' = @B D' = @BA?%,( < +O%,( < +DH' =%(%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*T%(D' =-g6B fade*<3<*TD8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*T%(D' =-g6B fade*<3<*T+p+0+T0 ++0+T0 +    0L0 p \(  \x \ c $4< `}    \ 0|6   F2Make knowledge shared within multiple applicationsb \ <8 @ IOntology-based Knowledge \ <X= ` p  ; Application  l \ 6"` @x F  0 \  0b \ <B3"`0 0 IOntology-based Knowledge  \ <F @p  ; Application  t  \ 6G<"`` P   \ <K3f"` p  ; Application  t  \ 6z"`` P   \ 0O Pp  B.Make knowledge independent of application codeH \ 0޽h ? ff[[ffRR|___PPT10u..  A+D=' = @B +   0L0 pk(  pr p S ,U<     R p C *Aj0299125 p 0V`  o-- How to store ontologies? 2  p 0[ `7  q-- How to operate ontologies? 2  p 0`@ `  O-- How to make more benefits? 2H p 0޽h ? ff[[ffRR|___PPT10i. W+D=' = @B +   0 L0 tS(  tr t S $j< `   r t S j< `   fb t 0"` 2 t <̙"`   ? User Tables  H t 0޽h ? ff[[ffRR|___PPT10u.. +D=' = @B +   0L0 x&(  xx x c $L< `   x x c $< `   fb x 0"` 2 x <̙"`   ? User Tables  2 x <P"`   ESystem-defined TablesH x 0޽h ? ff[[ffRR|___PPT10u.. +D=' = @B +g   0L0 ZR|(  |~ | s *x< `}   ~ | s *n< 0   |0 ZA ?AA ?<p`  H | 0޽h ? ff[[ffRR|___PPT10u.. +D=' = @B +   0L0 ;(  r  S P< `}   r  S (< `    0\`002  [-- System-defined Classes for Anonymous Classes -- Bootstrap Ontology -- Loading Ontologies\ 2\Q H  0޽h ? ff[[ffRR|___PPT10i.\ 4+D=' = @B +   0L0 ` D(  r  S `< `}   r  S 8< `  fb  0"`2  <$̙"`    ? User Tables  2  <X"`   ESystem-defined Tables  0hpp UONT_EXPAND operator& 2 f l  6Z"`0   0  3ONT_RELATED Operator (with ONT_PATH & ONT_DISTANCE)Z4 2 f l  6Z"` @ l  6b"`$L xH  0޽h ? ff[[ffRR|___PPT10i.t i+D=' = @B +}   0  $(  r  S < ``   r  S < `  H  0޽h ? ff[[ffRR|___PPT10i.]  5+D=' = @B +   0 00(  x  c $< ``   x  c $,{< `  H  0޽h ? ff[[ffRR|___PPT10i.]  5+D=' = @B +   0 P0(  x  c $< ``   x  c $h< `@  H  0޽h ? ff[[ffRR|___PPT10i.]  5+D=' = @B +   0 L0 p((    B + <     R  C *Aj0299125H  0޽h ? ff[[ffRR|___PPT10i.v +D=' = @B +   0L0 B(  r  S 3< `p   :  3 A    04PI :Internal Inferred relation: SubPropertyOfInverseOf(f,g)f(x,y) g(y,x) for every x,y,W 28>!   0=f1 "Example: f : hasMother g: ParentOf##,   0B 0@ ^Remark: with the expansion of subPropertyOf and SubPropertyOfInverseOf, we can retrieve all relationship tuples for a given property,including those that are implied through sub-properties and inverse-properties. 2P # GH  0޽h ? ff[[ffRR|___PPT10i.v n:+D=' = @B +   0 L0 ((    BDO <     R  C *Aj0299125H  0޽h ? ff[[ffRR|___PPT10i.{ \+D=' = @B +   0L0 $(  r  S ,U< `}   r  S V< `   H  0޽h ? ff[[ffRR|___PPT10i.{ P }a+D=' = @B +   0L0 x >(  r  S e<    : 5 3 A` f 7 0g P R"Two tables for restaurant database# 2#f" 8 0"`@  9 0P>~` G X(Cuisine Ontology for restaurant database) 2)l2 : 6"`PP@: ; 3 A@ : : < 3 A `l2 = 6"` P  > 0pp d  h8The above relationship ontology is stored as below table9 29H  0޽h ? ff[[ffRR|___PPT10i. pt?+D=' = @B +n    0L0 m e  (  v  0y If a user want to find out which restaurants serve cuisine of type  Latin American , the query might be following:s 2s  0h"`Q 4SELECT r.name, r.address FROM serverd_food sf, restaurant r WHERE r.id = sf.r_id AND ONT_RELATED(sf.cuisine, IS_A , Latin American , Cuisine Ontology )=1;. 2UDf  $  0AP@G  MActually, the query will be implemented as following transformation in OracleN 2N.  0h"`Q  SELECT r.name, r.address FROM serverd_food sf, restaurant r WHERE r.id = sf.r_id AND sf.cuisine IN (SELECT term1 FROM relationships START WITH term2 =  Latin American AND relation =  IS_A CONNECT BY PRIOR term1 = term2 AND relation =  IS_A );. 2Uf     B <    H  0޽h ? ff[[ffRR|___PPT10i. nX+D=' = @B +-   0L0 ,$(  r  S H{< `     0" fContinuing last case, if there are more than one relationships relate to cuisine of type, the query might be applied OR, AND or NOT operator. Take OR as an example, if add  EQV relationship as below figure, then want to find out which restaurants serve cuisine of type  Latin American , the query might be:4 24:  3 A@ ,   0"`p  ZBSELECT r.name, r.address FROM serverd_food sf, restaurant r WHERE r.id = sf.r_id AND ONT_RELATED(sf.cuisine, IS_A OR EQV , Latin American , Cuisine Ontology )=1;J 2Uf 'f   H  0޽h ? ff[[ffRR|___PPT10i. Pnp+D=' = @B +   0L0 (    BP < `     0P@ uCThen, the transformed query in Oracle will be implemented as below:D 2Dl  0"`PP  SELECT r.name, r.address FROM serverd_food sf, restaurant r WHERE r.id = sf.r_id AND sf.cuisine IN (SELECT term1 FROM (SELECT term1,relation,term2 FROM relationships UNION SELECT term2,relation,term1 FROM relationships WHERE relation= EQV ) START WITH term2 =  Latin American AND relation =  IS_A OR relation =  EQV CONNECT BY PRIOR term1 = term2 AND relation =  IS_A );fx 2U"f|:f6f   H  0޽h ? ff[[ffRR|___PPT10i. @m…+D=' = @B +   0L0 ((    Bx <     R  C *Aj0299125H  0޽h ? ff[[ffRR|___PPT10i. 0+D=' = @B +   0L0  $(  r  S $< `}   r  S < `  H  0޽h ? ff[[ffRR|___PPT10i. +D=' = @B +   0L0 0$(  r  S < `   r  S \< `  H  0޽h ? ff[[ffRR|___PPT10i. >x+D=' = @B +   0L0 @ J(    B| < `     0`  uTesting Content 1: Execute ONT_EXPAND operator with the index (transitive closure table) for several different terms.v 2v  0$  @@ BTesting Results: 2:  3 Ap& `  0 P` cConclusion: The query runtime only increase linearly when increasing the number of rows of dataset.d 2d|  0     Query Sentence: Select count(*) from table (ONT_EXPAND(NULL, IS_A ,:term, Cancer_Ontology ));$^ 2N,-H  0޽h ? ff[[ffRR|___PPT10i. Pپ+D=' = @B +   0L0 P(    B  < `     00  iTesting Content 2: Execute ONT_RELATED operator with three evaluation mechanisms and compare the results.j 2j  0  @ BTesting Results: 2  0X  Pp }Conclusion: The index evaluation mechanism which uses index table and transitive closure table is best for saving query time.~ 2~  0  *  DQuery Sentence: Select count(*) from patients where ONT_RELATED (diagnosis,  IS_A ,  EOD ,  Cancer_Ontology ) =1;$r 2b\:  3 A J H  0޽h ? ff[[ffRR|___PPT10i. 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