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1 V8: Service-based Interoperability – 2 Dr.-Ing. Reiner Wichert Fraunhofer-Institut für Graphische Datenverarbeitung IGD Holger Graf Fraunhofer-Institut.

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Presentation on theme: "1 V8: Service-based Interoperability – 2 Dr.-Ing. Reiner Wichert Fraunhofer-Institut für Graphische Datenverarbeitung IGD Holger Graf Fraunhofer-Institut."— Presentation transcript:

1 1 V8: Service-based Interoperability – 2 Dr.-Ing. Reiner Wichert Fraunhofer-Institut für Graphische Datenverarbeitung IGD Holger Graf Fraunhofer-Institut für Graphische Datenverarbeitung IGD Mohammad-Reza (Saied) Tazari Fraunhofer-Institut für Graphische Datenverarbeitung IGD Ambient Intelligence WS 10/11

2 2 Gliederung OASIS SOA Referenzmodell & Referenzarchitektur Bespiel einer SOA: Web Services Die OWL-S Ontologie für Dienstebeschreibung Service Management in PERSONA

3 3 OWL-S: Semantic Markup for Web Services Literatur: Wichtige Ontologiemodule:

4 4 Top level of the service ontology

5 5 Selected classes and properties of the Profile

6 6 Selected classes and properties of the Profile (as UML)

7 7 Top level of the process ontology – 1

8 8 Top level of the process ontology – 2

9 9 Top level of the process ontology (as UML)

10 10 Grounding: Mapping between OWL-S and WSDL

11 11 Gliederung OASIS SOA Referenzmodell & Referenzarchitektur Bespiel einer SOA: Web Services Die OWL-S Ontologie für Dienstebeschreibung Service Management in PERSONA Semantic RPC Der PERSONA Ansatz Die Realisierung

12 12 Literaturhinweis PERSONA Manual unter Using Queries for Semantic-based Service Utilization unter ceur-ws.org/Vol-525/ceur-ws.org/Vol-525/ Goal-based Service Utilization Using SPARQL and OWL-S unter

13 13 Gliederung OASIS SOA Referenzmodell & Referenzarchitektur Bespiel einer SOA: Web Services Die OWL-S Ontologie für Dienstebeschreibung Service Management in PERSONA Semantic RPC Der PERSONA Ansatz Die Realisierung

14 14 The Vision: Semantic RPC his phone turned the sound down by sending a message to all the other local devices that had a volume control [excerpt from The Semantic Web, Scientific American, 2001] An assumption: The phone is supposed to only broadcast a message without any dependency on addressing and accessing the targeted devices Just rely on shared concepts turn the sound down if you are in the vicinity of location l and have a volume control

15 15 Semantic RPC Goal-based Interoperability Requests simply express the meaning of what is requested to be achieved neither addressing concrete target components nor using syntactical artefacts, such as interfaces no dependency on technical details of the "how"s, but participants just focus on the "what"s SQL-like query languages generally provide a suitable formalism for goal- based communication just rely on a data model pose no technological or methodical requirements on query handling use simple "speech acts", such as DELETE, INSERT, SELECT, and UPDATE to formulate the goal while the remaining of the query allows to unambiguously interpret what the query is supposed to achieve

16 16 Realizing The Vision: The Haves – The Groundwork SOA provides the needed level of abstraction for interoperability The shared knowledge: a set of interfaces instead of concrete references to other components mechanism to publish realizations of those interfaces mechanism to find, bind, and utilize desired realizations of them Realizations of SOA, e.g. Web Services & OSGi, concentrate on needed programmatic interfaces service registration and search based on signature declarations, possibly using keyword- and /or taxonomy-based ad and inquiry mechanisms matches with no or little machine-interpretable semantics

17 17 Realizing The Vision: The Haves – Semantic Add-on The goal of semantic frameworks more inference and reasoning potential based on logical implications of ontological assertions when performing tasks, such as service advertising, constructing service requests, matchmaking, and composition Existing solutions OWL-S (www.daml.org/services/owl-s) Web Service Modeling Ontology (www.wsmo.org) Semantic Annotations for WSDL (www.w3.org/2002/ws/sawsdl) …

18 18 Realizing The Vision: The Haves – The Case of OWL-S (I)

19 19 Realizing The Vision: The Haves – The Case of OWL-S (II) Denker/Kagal/Finin/Paolucci/Sycara (ISWC03) and Preist (ISWC04) Service request: use profile ontology to make a query by example Two steps:(1) fetch a matching advertised profile (2) call the service Consequences on the client side Think in terms of signatures Platform heterogeneity could become an issue

20 20 Realizing The Vision: The Not-Haves Concrete syntax for formulating service requests solely based on domain ontologies Independence from concrete signatures Requesters view: semantic RPC in a single step Hiding distribution and heterogeneity of platforms Semantic RPC bundles the whole process of issuing a request matchmaking with profiles of available & accessible services deriving input parameters for the matched one(s) calling the service(s) getting the results mapping them back onto an appropriate response

21 21 Gliederung OASIS SOA Referenzmodell & Referenzarchitektur Bespiel einer SOA: Web Services Die OWL-S Ontologie für Dienstebeschreibung Service Management in PERSONA Semantic RPC Der PERSONA Ansatz Die Realisierung

22 22 Ansatz – 1. Service Classes in the Domain Ontology The OWL-S concept service:Service as the root of service classes Explicit relationships between service classes and other concepts in the ontology More expressive OWL-S processes and profiles based on the explicit spec of the service class context Example domain: Lighting

23 23 Weiteres Beispiel: Several classes of services

24 24 Ansatz – 2. Property Path See paths in and property chain in Comparable with the usage of dummy variables in SPARQL SELECT ?o WHERE { r1 :p1 ?dummy1. ?dummy1 :p2 ?dummy2. ?dummy2 :p3 ?o. }

25 25 Ansatz – 3. The Concept of Data View How a service class views the world in terms of data Derived from the domain ontology that includes the service classes Virtually, a table with columns representing data reachable through certain property paths E.g., for a software component controlling exactly the four lamps in a flat, the imaginary table at a given point in time may look like the following:

26 26 Ansatz – 4. Registering Services The semantic of input/output parameters and effects effects either change certain columns of certain rows, add a new row, or remove existing rows (analogous to SQL update, insert, and delete ) inputs either select a certain set of rows by being incorporated in a filtering function, or are used in expressions defining effects outputs return the values in certain columns after filtering and just before or after the effects has taken place (analogous to SQL select ) Extension of OWL-S, e.g. change effect

27 27 Ansatz – 5. Query Language with a SPARQL-based Syntax Example queries

28 28 Gliederung OASIS SOA Referenzmodell & Referenzarchitektur Bespiel einer SOA: Web Services Die OWL-S Ontologie für Dienstebeschreibung Service Management in PERSONA Semantic RPC Der PERSONA Ansatz Die Realisierung

29 29 Overview of the implementation of the service bus

30 30 The service bus members

31 31 Realization of the OWL-S Service Profiles (with PERSONA extensions)

32 32 Realization of service queries in terms of service request objects

33 33 Service Calls & Service Responses

34 34 Service Bus – Summary Realizes the semantic interoperability platform sketched on slide 20 More specifically, handles service requests Bus strategy: one specific instance of the service bus is the coordinator with a global registry of service profiles Possibilities for registering service profiles, querying the profiles, and subscribing for the availability of services Additional main messages: service requests, service calls, and service responses Service request: certain data structure that could be the result of parsing a query similar to the one on slide 27 Covers all sorts of service-based interoperability needs within PERSONA

35 35 Danke für die Aufmerksamkeit & bis zur nächsten Vorlesung


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