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XMLApe Architecture

XMLApe Architecture. XMLApe Data Source. XMLApe GUI. XMLApe Engine. XMLApe Data Source. Figure 1. EXAMPLE - Flights Schema. <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://xmlape.cc.gatech.edu/myflights"

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XMLApe Architecture

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  1. XMLApe Architecture XMLApe Data Source XMLApe GUI XMLApe Engine XMLApe Data Source Figure 1

  2. EXAMPLE - Flights Schema <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://xmlape.cc.gatech.edu/myflights" xmlns="http://xmlape.cc.gatech.edu/myflights" elementFormDefault="qualified"> <xsd:element name="flights"> <xsd:complexType> <xsd:sequence> <xsd:element ref="flight" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="flight" type="flightType"/> <xsd:complexType name="flightType"> <xsd:sequence> <xsd:element name="airline" type="xsd:string" minOccurs="1" maxOccurs="1"/> <xsd:element name="from" type="xsd:string" minOccurs="1" maxOccurs="1"/> <xsd:element name="to" type="xsd:string" minOccurs="1" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> </xsd:schema> Figure 2

  3. EXAMPLE - Flights Data <?xml version="1.0"?> <flights xmlns="http://xmlape.cc.gatech.edu/myflights" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlape.cc.gatech.edu/myflights myflights.xsd"> <flight> <airline>Delta</airline> <from>Atlanta</from> <to>Detroit</to> </flight> <flight> <airline>Delta</airline> <from>Detroit</from> <to>Atlanta</to> </flight> <flight> <airline>USAirways</airline> <from>New York</from> <to>Los Angeles</to> </flight> </flights> Figure 3

  4. EXAMPLE - Car Rentals Schema <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://xmlape.cc.gatech.edu/myrental" xmlns="http://xmlape.cc.gatech.edu/myrental" elementFormDefault="qualified"> <xsd:element name="rentals"> <xsd:complexType> <xsd:sequence> <xsd:element ref="rental" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="rental" type="rentalType"/> <xsd:complexType name="rentalType"> <xsd:sequence> <xsd:element name="company" type="xsd:string" minOccurs="1" maxOccurs="1"/> <xsd:element name="from" type="xsd:string" minOccurs="1" maxOccurs="1"/> <xsd:element name="to" type="xsd:string" minOccurs="1" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> </xsd:schema> Figure 4

  5. EXAMPLE - Car Rentals data <?xml version="1.0"?> <rentals xmlns="http://xmlape.cc.gatech.edu/myrental" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlape.cc.gatech.edu/myrental myrental.xsd"> <rental> <company>Avis</company> <from>Atlanta</from> <to>Atlanta</to> </rental> <rental> <company>Dollar</company> <from>Atlanta</from> <to>Athens</to> </rental> <rental> <company>Thrifty</company> <from>New York</from> <to>Hartford</to> </rental> </rentals> Figure 5

  6. TRAIN CAR RENTAL EVENT FLIGHT HOTEL CRUISE URL: Start screen with s-buttons and empty XMLApe Query Form Figure 6

  7. Query Schema <?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://xmlape.cc.gtri.gatech.edu/query" xmlns="http://xmlape.cc.gtri.gatech.edu/query" elementFormDefault="qualified"> <xsd:element name="query" type="queryType" /> <xsd:complexType name="queryType"> <xsd:sequence> <xsd:element name="source" type="sourceType" minOccurs="0" maxOccurs="unbounded" /> <xsd:element name="select" type="selectType" minOccurs="0" maxOccurs="unbounded" /> <xsd:element name="join" type="joinType" minOccurs="0" maxOccurs="unbounded" /> </xsd:sequence> </xsd:complexType> <xsd:complexType name="sourceType"> <xsd:sequence> <xsd:element name="location" type="xsd:anyURI" minOccurs="1" maxOccurs="1" /> <xsd:element name="alias" type="xsd:string" minOccurs="1" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> Figure 7

  8. Query Schema (cont.) <xsd:complexType name="selectType"> <xsd:sequence> <xsd:element name="schemaRef" type="schemaRefType" minOccurs="1" maxOccurs="1"/> <xsd:element name="value" type="xsd:string" minOccurs="1" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> <xsd:complexType name="joinType"> <xsd:sequence> <xsd:element name="schemaRef" type="schemaRefType" minOccurs="2" maxOccurs="unbounded" /> </xsd:sequence> </xsd:complexType> <xsd:complexType name="schemaRefType"> <xsd:sequence> <xsd:element name="alias" type="xsd:string" minOccurs="1" maxOccurs="1"/> <!-- change the type to specify XPath when we get a grip on that --> <xsd:element name="field" type="xsd:string" minOccurs="1" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> </xsd:schema> Figure 8

  9. Empty Query Document <?xml version="1.0" encoding="UTF-8"?> <query xmlns="http://xmlape.cc.gtri.gatech.edu/query" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://xmlape.cc.gtri.gatech.edu/query query.xsd"> </query> Figure 9

  10. Empty Query Result Schema <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="query1_results" xmlns="query1_results" elementFormDefault="qualified"> <xsd:element name="results"> <xsd:complexType> <xsd:sequence> <xsd:element ref="result" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="result" type="resultType"/> <xsd:complexType name="resultType"> <xsd:sequence> </xsd:sequence> </xsd:complexType> </xsd:schema> Figure 10

  11. Empty Query Result Data <?xml version="1.0"?> <results xmlns="query1_results" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="query1_results query1_results.xsd"> </results> Figure 11

  12. TRAIN AIRLINE FROM TO FLIGHT RENTAL EVENT FLIGHT HOTEL CRUISE URL: XMLApe Query Form generated by the GUI from the XML schema in Figure 2 Figure 12

  13. TRAIN AIRLINE COMPANY TO FROM AIRLINE TO FROM FROM TO FLIGHT FLIGHT RENTAL EVENT FLIGHT HOTEL CRUISE URL: RENTAL XMLApe Query Form; two FLIGHT schemas, Figure 2, and one RENTAL schema, Figure 4 Figure 13

  14. 3-source Query Document after Figure 13; no selections; no joins <?xml version="1.0" encoding="UTF-8"?> <query xmlns="http://xmlape.cc.gtri.gatech.edu/query" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://xmlape.cc.gtri.gatech.edu/query query.xsd"> <source> <!-- datasource for 'myflights.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myflights.datasource</location> <alias>myflights1</alias> </source> <source> <!-- datasource for 'myflights.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myflights.datasource</location> <alias>myflights2</alias> </source> <source> <!-- datasource for 'myrental.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myrental.datasource</location> <alias>myrental1</alias> </source> </query> Figure 14

  15. Result Schema for 3-source query; no selections; no joins <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="query2_results" xmlns="query2_results" xmlns:myrental="http://xmlape.cc.gatech.edu/myrental" xmlns:myflights="http://xmlape.cc.gatech.edu/myflights" elementFormDefault="qualified"> <xsd:import namespace="http://xmlape.cc.gatech.edu/myrental" schemaLocation="myrental.xsd"/> <xsd:import namespace="http://xmlape.cc.gatech.edu/myflights" schemaLocation="myflights.xsd"/> <xsd:element name="results"> <xsd:complexType> <xsd:sequence> <xsd:element ref="result" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="result" type="resultType"/> <xsd:complexType name="resultType"> <xsd:sequence> <xsd:element name="myflights1" type="myflights:flightType" minOccurs="1" maxOccurs="1"/> <xsd:element name="myflights2" type="myflights:flightType" minOccurs="1" maxOccurs="1"/> <xsd:element name="myrental1" type="myrental:rentalType" minOccurs="1" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> </xsd:schema> Figure 15

  16. Result Data for 3-source query;no selections; no joins <?xml version="1.0"?> <results xmlns="query2_results" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:myrental="http://xmlape.cc.gatech.edu/myrental" xmlns:myflights="http://xmlape.cc.gatech.edu/myflights" xsi:schemaLocation="query2_results query2_results.xsd"> <result> <myflights1> <myflights:airline>Delta</myflights:airline> <myflights:from>Atlanta</myflights:from> <myflights:to>Detroit</myflights:to> </myflights1> <myflights2> <myflights:airline>Delta</myflights:airline> <myflights:from>Atlanta</myflights:from> <myflights:to>Detroit</myflights:to> </myflights2> <myrental1> <myrental:company>Avis</myrental:company> <myrental:from>Atlanta</myrental:from> <myrental:to>Atlanta</myrental:to> </myrental1> </result> Figure 16

  17. Result Data for 3-source query;no selections; no joins (cont.) 25 more <result>’s ……. and, finally, the last one: <result> <myflights1> <myflights:airline>USAirways</myflights:airline> <myflights:from>New York</myflights:from> <myflights:to>Los Angeles</myflights:to> </myflights1> <myflights2> <myflights:airline>USAirways</myflights:airline> <myflights:from>New York</myflights:from> <myflights:to>Los Angeles</myflights:to> </myflights2> <myrental1> <myrental:company>Thrifty</myrental:company> <myrental:from>New York</myrental:from> <myrental:to>Hartford</myrental:to> </myrental1> </result> </results> Figure 17

  18. TRAIN COMPANY TO AIRLINE AIRLINE FLIGHT CAR FROM Detroit EVENT TO FLIGHT HOTEL FLIGHT CRUISE FROM URL: RENTAL FROM TO Query w/selections and joins in the XMLApe Query Form Surprise vacation: Leaving Detroit flying somewhere. Picking up a rental from that place and returning it to the same place. Leaving that place flying somewhere else. Figure 18

  19. Query Document w/selections and joins corresponding to Figure 18 <?xml version="1.0" encoding="UTF-8"?> <query xmlns="http://xmlape.cc.gtri.gatech.edu/query" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://xmlape.cc.gtri.gatech.edu/query query.xsd"> <source> <!-- datasource for 'myflights.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myflights.datasource</location> <alias>myflights1</alias> </source> <source> <!-- datasource for 'myflights.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myflights.datasource</location> <alias>myflights2</alias> </source> <source> <!-- datasource for 'myrental.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myrental.datasource</location> <alias>myrental1</alias> </source> Figure 19

  20. Query Document w/selections and joins (cont.)corresponding to Figure 18 <select> <schemaRef> <alias>myflights1</alias> <field>"XPath expression: flightType:from"</field> </schemaRef> <value>Detroit</value> </select> <join> <schemaRef> <alias>myflights1</alias> <field>"XPath expression: flightType:to"</field> </schemaRef> <schemaRef> <alias>myflights2</alias> <field>"XPath expression: flightType:from"</field> </schemaRef> <schemaRef> <alias>myrental1</alias> <field>"XPath expression: myRental:from"</field> </schemaRef> <schemaRef> <alias>myrental1</alias> <field>"XPath expression: myRental:to"</field> </schemaRef> </join> </query> Figure 20

  21. Schema for Result of query in Figure 19-20 <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="query3_results" xmlns="query3_results" xmlns:myrental="http://xmlape.cc.gatech.edu/myrental" xmlns:myflights="http://xmlape.cc.gatech.edu/myflights" elementFormDefault="qualified"> <xsd:import namespace="http://xmlape.cc.gatech.edu/myrental" schemaLocation="myrental.xsd"/> <xsd:import namespace="http://xmlape.cc.gatech.edu/myflights" schemaLocation="myflights.xsd"/> <xsd:element name="results"> <xsd:complexType> <xsd:sequence> <xsd:element ref="result" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="result" type="resultType"/> <xsd:complexType name="resultType"> <xsd:sequence> <xsd:element name="myflights1" type="myflights:flightType" minOccurs="1" maxOccurs="1"/> <xsd:element name="myflights2" type="myflights:flightType" minOccurs="1" maxOccurs="1"/> <xsd:element name="myrental1" type="myrental:rentalType" minOccurs="1" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> </xsd:schema> Figure 21

  22. Result Data for query in Figure 19-20 <?xml version="1.0"?> <results xmlns="query3_results" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:myrental="http://xmlape.cc.gatech.edu/myrental" xmlns:myflights="http://xmlape.cc.gatech.edu/myflights" xsi:schemaLocation="query3_results query3_results.xsd"> <result> <myflights1> <myflights:airline>Delta</myflights:airline> <myflights:from>Detroit</myflights:from> <myflights:to>Atlanta</myflights:to> </myflights1> <myflights2> <myflights:airline>Delta</myflights:airline> <myflights:from>Atlanta</myflights:from> <myflights:to>Detroit</myflights:to> </myflights2> <myrental1> <myrental:company>Avis</myrental:company> <myrental:from>Atlanta</myrental:from> <myrental:to>Atlanta</myrental:to> </myrental1> </result> </results> Figure 22

  23. Engine: Query Document breakdown (1 of 3) from Figure 19-20 <?xml version="1.0" encoding="UTF-8"?> <query xmlns="http://xmlape.cc.gtri.gatech.edu/query" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://xmlape.cc.gtri.gatech.edu/query query.xsd"> <source> <!-- datasource for 'myflights.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myflights.datasource</location> <alias>myflights1</alias> </source> <select> <schemaRef> <alias>myflights1</alias> <field>"XPath expression: flightType:from"</field> </schemaRef> <value>Detroit</value> </select> </query> Figure 23

  24. Engine: Result Data for query in Figure 23 <?xml version="1.0"?> <flights xmlns="http://xmlape.cc.gatech.edu/myflights" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlape.cc.gatech.edu/myflights myflights.xsd"> <flight> <airline>Delta</airline> <from>Detroit</from> <to>Atlanta</to> </flight> </flights> Figure 24

  25. Engine: Query Document breakdown (2 of 3) from Figure 19-20 <?xml version="1.0" encoding="UTF-8"?> <query xmlns="http://xmlape.cc.gtri.gatech.edu/query" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://xmlape.cc.gtri.gatech.edu/query query.xsd"> <source> <!-- datasource for 'myflights.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myflights.datasource</location> <alias>myflights2</alias> </source> </query> Figure 25

  26. Engine: Result Data for query in Figure 25 <?xml version="1.0"?> <flights xmlns="http://xmlape.cc.gatech.edu/myflights" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlape.cc.gatech.edu/myflights myflights.xsd"> <flight> <airline>Delta</airline> <from>Atlanta</from> <to>Detroit</to> </flight> <flight> <airline>Delta</airline> <from>Detroit</from> <to>Atlanta</to> </flight> <flight> <airline>USAirways</airline> <from>New York</from> <to>Los Angeles</to> </flight> </flights> Figure 26

  27. Engine: Query Document breakdown (3 of 3) from Figure 19-20 <?xml version="1.0" encoding="UTF-8"?> <query xmlns="http://xmlape.cc.gtri.gatech.edu/query" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://xmlape.cc.gtri.gatech.edu/query query.xsd"> <source> <!-- datasource for 'myrental.xsd' schema --> <location>http://xmlape.cc.gatech.edu/myrental.datasource</location> <alias>myrental1</alias> </source> <join> <schemaRef> <alias>myrental1</alias> <field>"XPath expression: myRental:from"</field> </schemaRef> <schemaRef> <alias>myrental1</alias> <field>"XPath expression: myRental:to"</field> </schemaRef> </join> </query> Figure 27

  28. Engine: Result Data for query in Figure 27 <?xml version="1.0"?> <rentals xmlns="http://xmlape.cc.gatech.edu/myrental" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlape.cc.gatech.edu/myrental myrental.xsd"> <rental> <company>Avis</company> <from>Atlanta</from> <to>Atlanta</to> </rental> </rentals> Figure 28

  29. Engine: Join Results from Figure 24-26-28 to get Result in Figure 22 <?xml version="1.0"?> <results xmlns="query3_results" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:myrental="http://xmlape.cc.gatech.edu/myrental" xmlns:myflights="http://xmlape.cc.gatech.edu/myflights" xsi:schemaLocation="query3_results query3_results.xsd"> <result> <myflights1> <myflights:airline>Delta</myflights:airline> <myflights:from>Detroit</myflights:from> <myflights:to>Atlanta</myflights:to> </myflights1> <myflights2> <myflights:airline>Delta</myflights:airline> <myflights:from>Atlanta</myflights:from> <myflights:to>Detroit</myflights:to> </myflights2> <myrental1> <myrental:company>Avis</myrental:company> <myrental:from>Atlanta</myrental:from> <myrental:to>Atlanta</myrental:to> </myrental1> </result> </results> Figure 29

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