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Session 49 - Semantic metadata management practical

This document describes a tutorial on using semantic metadata with Grid services. The tutorial will cover: 1. Setting up a Globus container and deploying various semantic services and an operation provider for sticky notes. 2. Attaching RDF semantic bindings to sticky notes to represent their metadata. 3. Querying the semantic bindings of sticky notes using SPARQL or other query languages. The queries can exploit relationships defined in an ontology. The hands-on exercises will guide participants in building a semantically-aware Grid service by completing the various setup and configuration steps. Participants will learn how to attach, query, and infer over semantic metadata for Grid resources.

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Semantic Sticky Note: RDF Metadata Access and Querying Using GT4 Java WS Session 49. July 15th, 2009 Oscar Corcho, Carlos Buil (Universidad Politécnica de Madrid) Work distributed under the license Creative Commons Attribution-Noncommercial-Share Alike 3.0
Tutorial Roadmap • Objectives • Hands-on: Build a Semantically-Aware Grid Service – Structure and materials – Exercises • 1. Setup the Globus Container • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Metadata about Sticky Notes General descriptions about events
Context & Technologies Enabling Ontology Inference technologies RDFS 2 Query/Retrieve Semantic Metadata Bindings Of all Resources Service RDF 1.1 Forward request via Operation Provider Properties Resource Service Lifetime “Oscar Corcho 1 Metadata Semantics is organizing Create/Query Semantic an event in .. Seeking Bindings of this Resource Client ….. ” Others… Minimally-intrusive GT4 WSRF Sticky augmentation Note resources to be described and shared
Roadmap • Objectives • Structure and materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Structure • Each chapter includes: – A discussion of the concepts – A discussion of implementation details – Hands-on exercises – A summary
Tutorial Material • In a browser window, please go to & bookmark: – http://www.dia.fi.upm.es/~ocorcho/ISSGC2009/Semant icGridPractical/ • We will be connecting to – ssh issgc-client-01.polytech.unice.fr
Roadmap • Objectives • Structure and materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Ex1. Deploy the Globus Container • In this exercise, – we will download: • The Globus Container • The source code for the Semantic Grid tutorial – Includes Basic Sticky Note source – ... and we will setup (set environment and run): • The Globus Container • The Semantic Binding Service Suite • An operation provider for sticky notes • The StickyNote Service
Ex1. Deploy Semantic Services & Operation Provider Into the Globus Container we will deploy Semantic Binding Service Suite create WS-Addressing: epr SB Factory create WS-RP: Get/Set/Query Properties SB query SB Client WS-Notif: Subscribe / Notify SB Inspect- RDF WS-RL: Destroy , SetTerminationTime Semantic props . . . Binding WS-RL ++: archive Query w/o Inference, UpdateContent Query( over unified view) query Metadata Query
Ex1. Deploy Semantic Services & Operation Provider • The Semantic Services suite: – The SB Factory Service, • creating contextualized RDF graphs (i.e. Semantic Bindings) – The SB Service, • WS-Resource representatives of Semantic Bindings – The Metadata Query Service, • Global view over multiple Semantic Bindings exercise-install/SemanticBindingService/src/
Ex1. Deploy Semantic Services & Operation Provider • Semantics Operation Provider, a proxy to the Semantic Binding Service. Could be augmented with any WSRF service and make it semantically aware. exercise-install/SemanticsOperationProvider/src/ • Sticky Note, a WSRF service that allows creating and maintaining resources called sticky notes. exercise-install/stickynote/src/
Hands-on Exercises Student Notes, Chapters 1 and 2
Ex1 Review • This is the setup obtained after setting up all the components in this exercise Client WSRF Ops. & Reosurce create Specific Ops EPR End Point References EPR Resources key key WSRF Operation Resource RP key ... RP Providers Properties RP RP ... RP RP ... Resource Home StickyNoteService GT4 Java WS Core
Ex1 Base Sticky Note Capabilities 1. Run container. 2. Create a Sticky Note $GLOBUS_LOCATION/bin/create-note –s http://local.... • Write a message to a Sticky Note $GLOBUS_LOCATION/bin/write-note –e note-123.epr HelloWorld • Read the message of a Sticky Note $GLOBUS_LOCATION/bin/show-note –e note-123.epr • Destroy a Sticky Note $GLOBUS_LOCATION/bin/wsrf-destroy –e note123.epr Repeat show-note after this step….
Ex1 Review • This is the setup obtained after completing this exercise Newly deployed Semantics operation Client provider Newly deployed services EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Roadmap • Objectives • Structure and materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Ex3. Attach Semantic Bindings to a rdf:type event1 Sticky Note event event2 local_event • RDF is the W3C recommended standard for rdf:type metadata representation. “Oscar Corcho 13/07/2008 Personal_event is organizing rdf:type • RDF is also the base representation for more an event in.. event5 expressive SW languages. ….. ” rdf:type rdf:type • Semantic Bindings could represent metadata involves 13/07/2008 event3 in RDF format in addition to other formats. event4 involves 16/07/2008 • In this exercise we will add RDF based involves involves descriptions to the content of StickyNotes. MalcolmAtkinson OscarCorcho CarlosBuil rdf:type rdf:type rdf:type professor researcher lecturer
Ex3. System Operation Clien t describe-note Create-note createSemantic Binding write EPR EPR key key create RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Ex3. Adding a new operation • This was the setup after completing exercise 2 Client Create-note EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Ex3. Adding a new operation • Add writeSemanticBinding operation to the Sticky Note service. (WSDL file) – Input: Semantic Binding content as RDF Client Create-note EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Ex3. Adding a new operation • Provide implementation for the new operation via the Semantics Operation Provider. (wsdd file) Clien t Create-note EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Ex3. Adding a new operation • Add JNDI configuration parameters to StickyNote to specify location of Semantic Services. (jndi xml file, caution to port numbers!!) Client Create-note EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core Jndi-config
Ex3. Client for Attaching an SB rdf:type event1 event • Extend the client to invoke the newly added operation. (DescribeNote source event2 local_event rdf:type code and post-deploy file) 13/07/2008 Personal_event rdf:type Clien event5 rdf:type t rdf:type describe-note involves 13/07/2008 create-note event3 event4 involves 16/07/2008 EPR key involves involves key RP key ... RP RP RP ... MalcolmAtkinson OscarCorcho RP RP ... CarlosBuil rdf:type SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService rdf:type rdf:type professor GT4 Java WS Core Jndi-config researcher lecturer
Hands-on Exercises Student Notes, Chapter 3
Ex3 Review • This is the setup obtained after completing this exercise – Now we have a SB resource that contains • The RDF content machine processable representation of the note content • The SB resource is contextualized with a pointer Client to the Sticky Note it describes (in its resource properties ) EPR EPR key key create RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Roadmap • Objectives • Structure and materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Ex4. Query SBs of a Sticky Note • RDF Metadata can be queried through a variety of languages. – Sparql, Serql, RDQL, RQL... – Languages allow desired graph patterns to be expressed. – Execution results are variable bindings for nodes in the specified pattern • In this exercise we’ll do querying of RDF based metadata
Ex4. Querying a Semantic Binding Query 1: SELECT N • Create a Sticky Note and attach a Semantic FROM {N} rdf:type {sti:Event} USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> Binding to it Query 2: SELECT N FROM {N} rdf:type {sti:Event}; sti:involves {sti:OscarCorcho} • Query USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> Note the Semantic Binding of the Sticky using the query-note operation rdf:type {sti:Professor} Query 3: SELECT N FROM {N} rdf:type {sti:Event}; sti:involves {M} Clien USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> t query-note SeRQL miniQuery ... EPR EPR key key RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Ex4. Query SBs of a Sticky Note • In this exercise we will add a querySemanticBinding operation to the Sticky Note Service (wsdl file) – Input: SeRQL query to be executed over the Semantic Binding attached to a Sticky note. – Output: an XML-formatted resultset • We will extend the client to invoke the newly added operation. (QueryNote source code and post-deploy file)
Hands-on Exercises Student Notes, Chapter 4
Ex4 Review • We executed queries over SBS • As is querying Query #1 RDF content rdf:type ? event ? • Relationships between ? terms missing • Represent our model of ? ? the world in a simple ontology • Exploit relations during querying
Roadmap • Objectives • Structure and materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Ex5. Query SBs with Inferences thing • RDF Schema is a simple ontology subClassOf event language. subClassOf Personal_event • RDFS could be used to develop models subClassOf local_event of different application domains. Model: subClassOf subClassOf educational_event – Terms (i.e. Vocabulary to be used in an RDF description). involves person – Relationships between subClassOf terms. researcher • In this exercise we’ll do queries by also subClassOf professor exploiting the information captured in an subClassOf ontology lecturer
Ex5. Query SBs with Inferences • In this exercise: – Setup a second Globus Container • With a WS-DAIOnt ontology service • Containing an RDFS ontology
Ex5. Query SBs with Inferences • We will add a querySemanticBindingInference operation to the Sticky Note Service (wsdl file) – Inputs: • SeRQL query to be executed over the Semantic Binding attached to a Sticky note. • The RDFS based knowledge model to be taken into acount during querying – Output: • an XML-formatted resultset of variable bindings • We will extend the client to invoke the newly added operation. (QueryNoteInference source code and post-deploy file)
Ex5. Querying SBs with inferences RDF Semantics says: • Create a Sticky Note and attach a Semantic (http://www.w3.org/TR/rdf-mt/) Query 1: SELECT N Binding FROMit{N} rdf:type {sti:Event} to USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> event • Query the Semantic Binding of the Sticky Note using Query 2: SELECT N subClassOf FROM {N} rdf:type {sti:Event}; sti:involves {sti:OscarCorcho} Personal_event the query-note-inference operation USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> subClassOf • Query 3: SELECT N rdf:type {sti:Event}; sti:involves {M} rdf:typelocal_event Contacts WS-DAIONT to obtain the RDFS ontology GT4 Java WS Core FROM {N} {sti:Professor} WS-DAIONT Clien USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> query-note-inference t RDFS rdf:type SeRQL Obtain ontology rdf:type RDFS event2 miniInferenceQuery ... ... EPR EPR key key RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Hands-on Exercises Student Notes, Chapter 5
Ex5 Review • We executed queries over the Semantic Binding attached to a Sticky Note via the StickyNote. • The query execution took into account not only the asserted but also the inferred statements. • So far, we’ve interrogated one single sticky note • How about queries across the semantic bindings of several sticky notes?
• Objectives • Structure and materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Ex6. Query over a Set of SBs • In this exercise we will use the query operation available in the metadata service – Input: a SeRQL query to be executed over a the set of Semantic Bindings. – Output: an XML-formatted resultset of variable bindings • Extend the client to invoke the query operation of the Metadata Service. (QueryAllNotes source code and post- deploy file)
Ex6. Query over a Set of SBs • Create a Sticky{N} rdf:type {sti:Event} metadata to it. Query 1: SELECT Note and attach FROM N • Create a second Sticky Note and attach metadata to it. USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> • Call .the query the operation of the Metadata Service to . . . search . over all created semantic bindings. . . . Clien t query describe-note SeRQL Create-note createSemantic Binding write EPR EPR key key key create RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
Hands-on Exercises Student Notes, Chapter 6
Ex6 Review • We executed queries over a set of SBs attached to a set of Sticky Notes • We used the Metada Service to perform this operation – Provides a global view of RDF content of all SB WS-Resources hosted by an SB service
Roadmap • Objectives • Structure and materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Ex7. Use a Remote SB Service • In this exercise we will repeat the previous exercise using a common Semantic Binding Factory Service, Semantic Binding Service and Metadata Query Service • Every student will create its own sticky notes and will attach Semantic Bindings to them – The content of the Semantic Bindings will be different types of events where a student specifies that he/she wants to meet other students on a specific date. – Every student can be identified by the following URI: http://www.ontogrid.net/StickyNote#NameSurname – Make queries to see whom you have to meet in the following days, and which types of events you have to attend to • How do we do it? – Change the configuration settings at the JNDI configuration parameters to specify where the Semantic Services are available • <<URLs of the Semantic Services>>
Ex7. Use a Remote SB Service EPR key key .... RP key ... RP RP RP ... .... RP RP ... eu.ist.. StickyNoteService GT4 Java WS Core Student 1 EPR .............. .............. .............. key .............. .............. ................ .............. ... .............. ................ .............. .............. key .............. ................ .............. .............. ................ .............. .............. .............. .............. SemanticBindingFactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core Server EPR key key .... RP key ... RP RP RP ... .... RP RP ... eu.ist.. StickyNoteService GT4 Java WS Core Student N
Hands-on Exercises Student Notes, Chapter 7
Roadmap • Objectives • Structure and materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
Summary • Storing and querying Semantic Bindings – SBs are first class citizens – SBs can be managed as any other Grid resource. • Minimally-intrusive extension mechanisms for augmenting existing service with metadata capabilities – Metadata Operation Provider. • Knowledge Models and inference rules allow for inferring new information – If RDFS model is not used for querying, then the results are the same as what it could be obtained using a traditional database.
Further Reading • Semantic-OGSA – An overview of S-OGSA: a Reference Semantic Grid Architecture. Oscar Corcho et. al. Journal of Web Semantics 4(2):102-115. June 2006 • WS-DAIOnt-RDF(S) – Accessing RDF(S) data resources in service-based Grid infrastructures. Miguel Esteban Gutiérrez, Isao Kojima, Said Mirza Pahlevi, Óscar Corcho, Asunción Gómez-Pérez. Concurrency and Computation: Practice and Experience 21(8): 1029-1051 (2009) • Websites http://www.semanticgrid.org/ http://www.ontogrid.eu/
Credits • The SG tutorial is based on the BAS GT4 Sticky Note Tutorial, developed by Rachana Ananthakrishnan, Charles Bacon, Lisa Childers, Ben Clifford, Jarek Gawor and Joe Insley (Globus Alliance) • The tutorial was created by Pinar Alper • We also thank people who tested the SG tutorial and helped improve it a lot. – Ted Wen – Borja Sotomayor – Paolo Missier – Rafael González-Cabero – Miguel Esteban Gutiérrez – David Buján Carballal – Cristina Vicente Torres – Carlos Buil Aranda • Work funded by the EC, OntoGrid and RSSGRID projects

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Session 49 - Semantic metadata management practical

  • 1.
    Semantic Sticky Note: RDFMetadata Access and Querying Using GT4 Java WS Session 49. July 15th, 2009 Oscar Corcho, Carlos Buil (Universidad Politécnica de Madrid) Work distributed under the license Creative Commons Attribution-Noncommercial-Share Alike 3.0
  • 2.
    Tutorial Roadmap • Objectives •Hands-on: Build a Semantically-Aware Grid Service – Structure and materials – Exercises • 1. Setup the Globus Container • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 3.
    Metadata about StickyNotes General descriptions about events
  • 4.
    Context & Technologies Enabling Ontology Inference technologies RDFS 2 Query/Retrieve Semantic Metadata Bindings Of all Resources Service RDF 1.1 Forward request via Operation Provider Properties Resource Service Lifetime “Oscar Corcho 1 Metadata Semantics is organizing Create/Query Semantic an event in .. Seeking Bindings of this Resource Client ….. ” Others… Minimally-intrusive GT4 WSRF Sticky augmentation Note resources to be described and shared
  • 5.
    Roadmap • Objectives • Structureand materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 6.
    Structure • Each chapterincludes: – A discussion of the concepts – A discussion of implementation details – Hands-on exercises – A summary
  • 7.
    Tutorial Material • Ina browser window, please go to & bookmark: – http://www.dia.fi.upm.es/~ocorcho/ISSGC2009/Semant icGridPractical/ • We will be connecting to – ssh issgc-client-01.polytech.unice.fr
  • 8.
    Roadmap • Objectives • Structureand materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 9.
    Ex1. Deploy theGlobus Container • In this exercise, – we will download: • The Globus Container • The source code for the Semantic Grid tutorial – Includes Basic Sticky Note source – ... and we will setup (set environment and run): • The Globus Container • The Semantic Binding Service Suite • An operation provider for sticky notes • The StickyNote Service
  • 10.
    Ex1. Deploy SemanticServices & Operation Provider Into the Globus Container we will deploy Semantic Binding Service Suite create WS-Addressing: epr SB Factory create WS-RP: Get/Set/Query Properties SB query SB Client WS-Notif: Subscribe / Notify SB Inspect- RDF WS-RL: Destroy , SetTerminationTime Semantic props . . . Binding WS-RL ++: archive Query w/o Inference, UpdateContent Query( over unified view) query Metadata Query
  • 11.
    Ex1. Deploy SemanticServices & Operation Provider • The Semantic Services suite: – The SB Factory Service, • creating contextualized RDF graphs (i.e. Semantic Bindings) – The SB Service, • WS-Resource representatives of Semantic Bindings – The Metadata Query Service, • Global view over multiple Semantic Bindings exercise-install/SemanticBindingService/src/
  • 12.
    Ex1. Deploy SemanticServices & Operation Provider • Semantics Operation Provider, a proxy to the Semantic Binding Service. Could be augmented with any WSRF service and make it semantically aware. exercise-install/SemanticsOperationProvider/src/ • Sticky Note, a WSRF service that allows creating and maintaining resources called sticky notes. exercise-install/stickynote/src/
  • 13.
  • 14.
    Ex1 Review • This is the setup obtained after setting up all the components in this exercise Client WSRF Ops. & Reosurce create Specific Ops EPR End Point References EPR Resources key key WSRF Operation Resource RP key ... RP Providers Properties RP RP ... RP RP ... Resource Home StickyNoteService GT4 Java WS Core
  • 15.
    Ex1 Base StickyNote Capabilities 1. Run container. 2. Create a Sticky Note $GLOBUS_LOCATION/bin/create-note –s http://local.... • Write a message to a Sticky Note $GLOBUS_LOCATION/bin/write-note –e note-123.epr HelloWorld • Read the message of a Sticky Note $GLOBUS_LOCATION/bin/show-note –e note-123.epr • Destroy a Sticky Note $GLOBUS_LOCATION/bin/wsrf-destroy –e note123.epr Repeat show-note after this step….
  • 16.
    Ex1 Review •This is the setup obtained after completing this exercise Newly deployed Semantics operation Client provider Newly deployed services EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 17.
    Roadmap • Objectives • Structureand materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 18.
    Ex3. Attach SemanticBindings to a rdf:type event1 Sticky Note event event2 local_event • RDF is the W3C recommended standard for rdf:type metadata representation. “Oscar Corcho 13/07/2008 Personal_event is organizing rdf:type • RDF is also the base representation for more an event in.. event5 expressive SW languages. ….. ” rdf:type rdf:type • Semantic Bindings could represent metadata involves 13/07/2008 event3 in RDF format in addition to other formats. event4 involves 16/07/2008 • In this exercise we will add RDF based involves involves descriptions to the content of StickyNotes. MalcolmAtkinson OscarCorcho CarlosBuil rdf:type rdf:type rdf:type professor researcher lecturer
  • 19.
    Ex3. System Operation Clien t describe-note Create-note createSemantic Binding write EPR EPR key key create RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 20.
    Ex3. Adding anew operation • This was the setup after completing exercise 2 Client Create-note EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 21.
    Ex3. Adding anew operation • Add writeSemanticBinding operation to the Sticky Note service. (WSDL file) – Input: Semantic Binding content as RDF Client Create-note EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 22.
    Ex3. Adding anew operation • Provide implementation for the new operation via the Semantics Operation Provider. (wsdd file) Clien t Create-note EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 23.
    Ex3. Adding anew operation • Add JNDI configuration parameters to StickyNote to specify location of Semantic Services. (jndi xml file, caution to port numbers!!) Client Create-note EPR key key RP key ... RP RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core Jndi-config
  • 24.
    Ex3. Client forAttaching an SB rdf:type event1 event • Extend the client to invoke the newly added operation. (DescribeNote source event2 local_event rdf:type code and post-deploy file) 13/07/2008 Personal_event rdf:type Clien event5 rdf:type t rdf:type describe-note involves 13/07/2008 create-note event3 event4 involves 16/07/2008 EPR key involves involves key RP key ... RP RP RP ... MalcolmAtkinson OscarCorcho RP RP ... CarlosBuil rdf:type SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService rdf:type rdf:type professor GT4 Java WS Core Jndi-config researcher lecturer
  • 25.
  • 26.
    Ex3 Review • This is the setup obtained after completing this exercise – Now we have a SB resource that contains • The RDF content machine processable representation of the note content • The SB resource is contextualized with a pointer Client to the Sticky Note it describes (in its resource properties ) EPR EPR key key create RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 27.
    Roadmap • Objectives • Structureand materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 28.
    Ex4. Query SBsof a Sticky Note • RDF Metadata can be queried through a variety of languages. – Sparql, Serql, RDQL, RQL... – Languages allow desired graph patterns to be expressed. – Execution results are variable bindings for nodes in the specified pattern • In this exercise we’ll do querying of RDF based metadata
  • 29.
    Ex4. Querying aSemantic Binding Query 1: SELECT N • Create a Sticky Note and attach a Semantic FROM {N} rdf:type {sti:Event} USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> Binding to it Query 2: SELECT N FROM {N} rdf:type {sti:Event}; sti:involves {sti:OscarCorcho} • Query USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> Note the Semantic Binding of the Sticky using the query-note operation rdf:type {sti:Professor} Query 3: SELECT N FROM {N} rdf:type {sti:Event}; sti:involves {M} Clien USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> t query-note SeRQL miniQuery ... EPR EPR key key RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 30.
    Ex4. Query SBsof a Sticky Note • In this exercise we will add a querySemanticBinding operation to the Sticky Note Service (wsdl file) – Input: SeRQL query to be executed over the Semantic Binding attached to a Sticky note. – Output: an XML-formatted resultset • We will extend the client to invoke the newly added operation. (QueryNote source code and post-deploy file)
  • 31.
  • 32.
    Ex4 Review • We executed queries over SBS • As is querying Query #1 RDF content rdf:type ? event ? • Relationships between ? terms missing • Represent our model of ? ? the world in a simple ontology • Exploit relations during querying
  • 33.
    Roadmap • Objectives • Structureand materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 34.
    Ex5. Query SBswith Inferences thing • RDF Schema is a simple ontology subClassOf event language. subClassOf Personal_event • RDFS could be used to develop models subClassOf local_event of different application domains. Model: subClassOf subClassOf educational_event – Terms (i.e. Vocabulary to be used in an RDF description). involves person – Relationships between subClassOf terms. researcher • In this exercise we’ll do queries by also subClassOf professor exploiting the information captured in an subClassOf ontology lecturer
  • 35.
    Ex5. Query SBswith Inferences • In this exercise: – Setup a second Globus Container • With a WS-DAIOnt ontology service • Containing an RDFS ontology
  • 36.
    Ex5. Query SBswith Inferences • We will add a querySemanticBindingInference operation to the Sticky Note Service (wsdl file) – Inputs: • SeRQL query to be executed over the Semantic Binding attached to a Sticky note. • The RDFS based knowledge model to be taken into acount during querying – Output: • an XML-formatted resultset of variable bindings • We will extend the client to invoke the newly added operation. (QueryNoteInference source code and post-deploy file)
  • 37.
    Ex5. Querying SBswith inferences RDF Semantics says: • Create a Sticky Note and attach a Semantic (http://www.w3.org/TR/rdf-mt/) Query 1: SELECT N Binding FROMit{N} rdf:type {sti:Event} to USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> event • Query the Semantic Binding of the Sticky Note using Query 2: SELECT N subClassOf FROM {N} rdf:type {sti:Event}; sti:involves {sti:OscarCorcho} Personal_event the query-note-inference operation USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> subClassOf • Query 3: SELECT N rdf:type {sti:Event}; sti:involves {M} rdf:typelocal_event Contacts WS-DAIONT to obtain the RDFS ontology GT4 Java WS Core FROM {N} {sti:Professor} WS-DAIONT Clien USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> query-note-inference t RDFS rdf:type SeRQL Obtain ontology rdf:type RDFS event2 miniInferenceQuery ... ... EPR EPR key key RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 38.
  • 39.
    Ex5 Review • Weexecuted queries over the Semantic Binding attached to a Sticky Note via the StickyNote. • The query execution took into account not only the asserted but also the inferred statements. • So far, we’ve interrogated one single sticky note • How about queries across the semantic bindings of several sticky notes?
  • 40.
    • Objectives • Structureand materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 41.
    Ex6. Query overa Set of SBs • In this exercise we will use the query operation available in the metadata service – Input: a SeRQL query to be executed over a the set of Semantic Bindings. – Output: an XML-formatted resultset of variable bindings • Extend the client to invoke the query operation of the Metadata Service. (QueryAllNotes source code and post- deploy file)
  • 42.
    Ex6. Query overa Set of SBs • Create a Sticky{N} rdf:type {sti:Event} metadata to it. Query 1: SELECT Note and attach FROM N • Create a second Sticky Note and attach metadata to it. USING NAMESPACE sti=<http://www.ontogrid.net/StickyNote#> • Call .the query the operation of the Metadata Service to . . . search . over all created semantic bindings. . . . Clien t query describe-note SeRQL Create-note createSemantic Binding write EPR EPR key key key create RP key ... RP key RP RP ... RP RP ... SemanticBinding StickyNoteService FactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core
  • 43.
  • 44.
    Ex6 Review • Weexecuted queries over a set of SBs attached to a set of Sticky Notes • We used the Metada Service to perform this operation – Provides a global view of RDF content of all SB WS-Resources hosted by an SB service
  • 45.
    Roadmap • Objectives • Structureand materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 46.
    Ex7. Use aRemote SB Service • In this exercise we will repeat the previous exercise using a common Semantic Binding Factory Service, Semantic Binding Service and Metadata Query Service • Every student will create its own sticky notes and will attach Semantic Bindings to them – The content of the Semantic Bindings will be different types of events where a student specifies that he/she wants to meet other students on a specific date. – Every student can be identified by the following URI: http://www.ontogrid.net/StickyNote#NameSurname – Make queries to see whom you have to meet in the following days, and which types of events you have to attend to • How do we do it? – Change the configuration settings at the JNDI configuration parameters to specify where the Semantic Services are available • <<URLs of the Semantic Services>>
  • 47.
    Ex7. Use aRemote SB Service EPR key key .... RP key ... RP RP RP ... .... RP RP ... eu.ist.. StickyNoteService GT4 Java WS Core Student 1 EPR .............. .............. .............. key .............. .............. ................ .............. ... .............. ................ .............. .............. key .............. ................ .............. .............. ................ .............. .............. .............. .............. SemanticBindingFactoryService SemanticBindingService MetadataQueryService GT4 Java WS Core Server EPR key key .... RP key ... RP RP RP ... .... RP RP ... eu.ist.. StickyNoteService GT4 Java WS Core Student N
  • 48.
  • 49.
    Roadmap • Objectives • Structureand materials • Hands-on: Build a Semantically-Aware Grid Service – Exercises • 1. Setup the Globus Container and Sticky Note Service • 2. Deploy Semantic Services and Operation Providers • 3. Attach Semantic Bindings to a Sticky Note • 4. Query Semantic Bindings of a Sticky Note • 5. Make Inferences on the Semantic Bindings of a Sticky Note • 6. Query over a Set of Semantic Bindings (advanced) • 7. Use a Remote Semantic Binding Service (advanced) – Summary • Conclusions
  • 50.
    Summary • Storing andquerying Semantic Bindings – SBs are first class citizens – SBs can be managed as any other Grid resource. • Minimally-intrusive extension mechanisms for augmenting existing service with metadata capabilities – Metadata Operation Provider. • Knowledge Models and inference rules allow for inferring new information – If RDFS model is not used for querying, then the results are the same as what it could be obtained using a traditional database.
  • 51.
    Further Reading • Semantic-OGSA – An overview of S-OGSA: a Reference Semantic Grid Architecture. Oscar Corcho et. al. Journal of Web Semantics 4(2):102-115. June 2006 • WS-DAIOnt-RDF(S) – Accessing RDF(S) data resources in service-based Grid infrastructures. Miguel Esteban Gutiérrez, Isao Kojima, Said Mirza Pahlevi, Óscar Corcho, Asunción Gómez-Pérez. Concurrency and Computation: Practice and Experience 21(8): 1029-1051 (2009) • Websites http://www.semanticgrid.org/ http://www.ontogrid.eu/
  • 52.
    Credits • The SG tutorial is based on the BAS GT4 Sticky Note Tutorial, developed by Rachana Ananthakrishnan, Charles Bacon, Lisa Childers, Ben Clifford, Jarek Gawor and Joe Insley (Globus Alliance) • The tutorial was created by Pinar Alper • We also thank people who tested the SG tutorial and helped improve it a lot. – Ted Wen – Borja Sotomayor – Paolo Missier – Rafael González-Cabero – Miguel Esteban Gutiérrez – David Buján Carballal – Cristina Vicente Torres – Carlos Buil Aranda • Work funded by the EC, OntoGrid and RSSGRID projects