DOCSLIB.ORG

Resource Annotation, Dissemination and Discovery in the Semantic Web of Things: a Coap-Based Framework

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Resource Annotation, Dissemination and Discovery in the Semantic Web of Things: a Coap-Based Framework 2013 IEEE International Conference on Green Computing and Communications and IEEE Internet of Things and IEEE Cyber, Physical and Social Computing Resource annotation, dissemination and discovery in the Semantic Web of Things: a CoAP-based framework M. Ruta, F. Scioscia, A. Pinto, E. Di Sciascio, F. Gramegna, S. Ieva, G. Loseto DEI - Politecnico di Bari via E. Orabona 4, I-70125, Bari, Italy (m.ruta, f.scioscia, agnese.pinto, disciascio)@poliba.it, (gramegna, ieva, loseto)@deemail.poliba.it Abstract—The Semantic Web of Things (SWoT) vision aims on context; severe computational constraints. In such dynamic to provide more advanced resource management and discov- environments, resource discovery is more challenging than ery w.r.t. standard Internet of Things architectures, by means static Web scenarios. of the integration of knowledge representation and reasoning techniques originally devised for the Semantic Web. This paper Among several alternatives proposed to define protocols proposes a novel SWoT framework, based on a backward- for object networks, 6LoWPAN [2] at network layer and the compatible extension of the Constrained Application Protocol Constrained Application Protocol (CoAP) [3] at application (CoAP), supporting non-standard inference services for semantic layer are emerging as widespread standards. Nevertheless, matchmaking. It allows retrieval and logic-based ranking of current solutions only allow a simplistic data-oriented rep- annotated resources. A computationally efficient data mining is also integrated in the framework to process raw data gathered resentation of resources and elementary retrieval procedures from the environment in order to detect high-level events and based on “string matching” between requests and resource characterize them with machine-understandable metadata. In attributes, which provide just binary yes/no outcomes. Exact order to test the effectiveness of the proposed approach, a case request/resource matches are very uncommon in real-world study about environmental risk prevention for Vehicular Ad-hoc scenarios with heterogeneous devices, sensors and actuators NETworks (VANETs) is presented. from several independent providers. Much like the case of Web Keywords—Semantic Web of Things, CoAP, Resource discovery, mashups [4], a large human effort is required on a case-by-case Matchmaking, Data mining basis for the design, deployment and integration of current IoT and Web of Things (WoT) applications. I. INTRODUCTION A more effective resource discovery should support also The Semantic Web of Things (SWoT) [1] is an emerging partial correspondences, possibly providing a measure of the vision, joining together the Semantic Web and the Internet of similarity degree between a request and available resources. Things paradigms. Every information resource in the Semantic Ideas and technologies adapted from the Semantic Web may be Web is annotated with metadata in RDF1 expressed w.r.t. useful to reach this goal. This paper proposes an overall frame- an RDF Schema2 or OWL3 ontology. Language specification work for the SWoT, managing semantic-based annotations of includes a standard XML serialization syntax. The adopted data streams, devices, high-level events and services with a knowledge representation models are grounded on formal, well-defined meaning w.r.t. a shared domain conceptualization 4 (i.e., ontology). The proposal introduces: (i) a slight backward- logic-based semantics. Query languages, e.g., SPARQL , are 5 6 defined to extract and combine asserted information, while compatible extensions to CoAP and CoRE Link Format reasoning engines can automatically infer knowledge entailed resource discovery protocol; (ii) computationally efficient data by a given Knowledge Base (KB). The goal of the SWoT is to mining procedures to detect and annotate high-level events associate semantically rich and machine-understandable infor- from raw data collected by a Semantic Sensor Network mation to real-world objects, locations and events, by means of (SSN) and the SSN-XG W3C ontology [5] is adopted as inexpensive, unobtrusive and often disposable micro-devices, reference vocabulary for resource annotations; (iii) a semantic- so enabling new classes of smart applications and services. based matchmaking via non-standard inference services [6] In order to allow this vision, frameworks and technologies to retrieve and rank resources best matching a given request, must deal with pervasive computing issues, that is resource, supporting not only full matches but also approximate ones. user and device volatility; platform heterogeneity; dependence In order to test and validate the proposed approach, a case study is also presented about environmental risk monitoring 1Resource Description Framework, W3C Recommendation, 10 February and management in Vehicular Ad-hoc NETworks (VANETs). 2004. http://www.w3.org/TR/rdf-primer/ 2RDF Vocabulary Description Language 1.0 (RDF Schema), W3C Recom- The remainder of the paper is organized as follows. Details mendation, 10 February 2004 http://www.w3.org/TR/rdf-schema/ 3OWL 2 Web Ontology Language Document Overview (Second Edition), 5We will refer to Constrained Application Protocol, IETF CoRE W3C Recommendation, 11 December 2012, http://www.w3.org/TR/owl2- Working Group Internet-Draft, version 13, 6 December 2012, overview/ http://tools.ietf.org/id/draft-ietf-core-coap-13.txt 4SPARQL Query Language for RDF, W3C Recommendation 15 January 6CoRE Link Format, IETF CoRE Working Group Internet-Draft, version 2008, http://www.w3.org/TR/rdf-sparql-query/ 14, 1 June 2012, http://www.ietf.org/id/draft-ietf-core-link-format-14.txt 978-0-7695-5046-6/13 $26.00 © 2013 IEEE 527 DOI 10.1109/GreenCom-iThings-CPSCom.2013.103 about functions and components of the framework architecture 6 V`J:C QG1CV are provided in Section II, followed by a case study in Section ]]C1H: 1QJ QC1VJ C%$1J III. Finally, Section IV discusses most relevant related research 1"1`Q QHQC and Section V closes the paper. ^$ 8GL]_ Q Q II. PROPOSED APPROACH Q: V1:7 Q In what follows the proposed CoAP enhancements, the semantic matchmaking framework (adopted for resource dis- Q1J@ QRV Q1J@ QRV covery) and the event mining approach will be thoroughly Q described. A. Semantic-enhanced CoAP and CoRE Link Format QRG:VRVJQ` V 1Q`@ Following the REST architectural style, CoAP adopts a loosely coupled client/server model, based on stateless op- Fig. 1. Framework Architecture erations on resources representation [3]. Each resource is a server-controlled abstraction, unambiguously identified by a In order to support a semantic-based resource discovery, URI (Uniform Resource Identifier). Clients access resources the CoAP protocol has been improved with a novel usage via synchronous request/response interactions, using HTTP- of standard URI-query options and with the addition of derived methods basically mapping the Read, Create, Update new ones. The CoAP-based SSN framework proposed here and Delete operations of data management. Basically, a CoAP extends the enhancements described in [7] enabling further message is composed of: (i) a 32-bit header, containing the non-standard inferences to support automated sensor discovery request method code (or response status); (ii) an optional token and composition, representing one of the main novelties of value, used to associate replies to requests, (iii) a sequence the approach. However the resulting framework is still fully of option fields (carrying information as resources URI and backward compatible: servers which do not support semantics payload media type), (iv) the payload data. The CoRE Link will simply reply to requests returning no resource records. Format specification is adopted for resource discovery. A Semantic-based requests are led back to standard CoAP ones client will access the reserved URI /.well-known/core by introducing three novel attributes: (i) reference ontology on the server via GET to retrieve available resources entry (ro), containing the URI of the domain conceptualization; (ii) points. Further GET requests will include URI-query fields semantic description (sd), i.e., the annotated request, com- to recall only resources with given attributes. Standardized pressed to cope with the verbosity of XML-based languages; query attributes include resource type (rt), interface usage (iii) annotation-type (at), specifying the compression format. (if), content-type (ct), and MIME (Multipurpose Internet The reference geographical location is achieved by specify- Mail Extension) type for a resource. Further non-reserved ing lg (longitude) and lt (latitude) attributes. Furthermore, attributes can be freely used. CoAP also provides push noti- md (maximum distance) is used to indicate the maximum fications without polling7, a useful feature when data have to acceptable distance (in meters) from the reference location be monitored over a time span. for retrieving resources. The adoption of a (center, distance) constraint allows the server to pre-filter resources, so avoiding In CoAP-based scenarios, each sensor is seen as a possibly expensive inference procedures for resources outside server, exposing both readings and internal information as the requested area. Finally, each provided reasoning task de- resources toward clients, which act on behalf of end-user voted to resource discovery is identified by a code, specified by applications. Different data series will be identified by dis- st (semantic task) attribute. In addition to existing tasks, a new tinct URIs. Further URIs will
Load more

Recommended publications
  • ICSOC Phd Symposium 2008
    Hamid Reza Motahari-Nezhad Farouk Toumani Yannis Velegrakis (Eds.) ICSOC PhD Symposium 2008 Co-located with 6th International Conference on Service Ori- ented Computing (ICSOC) Sydney, Australia, 1 December 2008 Proceedings Sponsor: IBM Research, USA Copyright c 2008 for the individual papers by the papers’ authors. Copying permitted for private and academic purposes. Re-publication of material from this volume requires permission by the copyright owners. Preface Service oriented computing (SOC) has rapidly transformed from a vision, in the beginning of the century, to realisation in paradigms such as Web services, Software-as-a-Service (SaaS) and cloud services. While this has provided the industry and practitioners with the opportunities for a new generation of products and services, it has brought forward a tremendous amount of challenges and open issues for researchers. The International Con- ferences on Service Oriented Computing (ICSOC) is a pioneering event for researchers, practitioners and industry leaders to discuss and share the success and achievements in this area. The ICSOC PhD Symposium, as part of the ICSOC conference, is an international forum for PhD students working in the broad areas of service computing, web services and ser- vice engineering to present and discuss emerging research problems and ideas on how to tackle these issues. The forum is intended to bring together PhD students and give them the opportunity to present and discuss their research in a constructively critical atmosphere. The symposium operates in a workshop format, giving PhD students an opportunity to showcase their research and providing them with feedback from senior international re- searchers and peer PhD students.
    [Show full text]
  • Modeling the Evaluation Criteria for Security Patterns in Web Service Discovery V.Prasath K.C.E.T, Department of IT S.Kumarapuram, Cuddalore India 607109
    ©2010 International Journal of Computer Applications (0975 – 8887) Volume 1 – No. 13 Modeling the Evaluation Criteria for Security Patterns in Web Service Discovery V.Prasath K.C.E.T, Department of IT S.Kumarapuram, Cuddalore India 607109. ABSTRACT of descriptions to various services that provide similar service Current trends in performing business-to-business transactions functionality. Automation of dynamic web service discovery is and enterprise application integration have been extended to the made viable by expression of domain specific knowledge [2] [4]. use of web service. With web services being accepted and Today’s systems, and the enterprises in which they reside, are so deployed in both research and industrial areas, the security related complex that even the most capable risk measurement tools are issues become important. Web services security has attracted the unlikely to yield risk values that are much better than rough attention of researchers in the area of security due to the proven indications of relative risk which, we should quickly add, is often fact that most attacks to businesses and organizations exploit web quite good enough in many situations. The problem is that the service vulnerabilities. The main goal of this research is to value of risk, whatever it turns out to be, is likely to be surrounded achieve security concept of the web service can be summarized to by a fairly large but unknown amount of uncertainty. This can this single value. In this paper, we evaluate common security create a dilemma for the decision-maker who must then decide patterns with respect to the STRIDE model of attacks by whether to invest in further safeguards, which will undoubtedly examining the attacks performed in different web services system.
    [Show full text]
  • REST Web Service Description for Graph-Based Service Discovery
    REST Web Service Description for Graph-Based Service Discovery B Rosa Alarcon, Rodrigo Saffie, Nikolas Bravo( ), and Javiera Cabello Computer Science Department, Pontificia Universidad Catolica de Chile, Santiago, Chile [email protected], {rasaffie,ngbravo,jacabell}@uc.cl Abstract. Unlike WSDL/SOAP based services, REST services lack a widely accepted service description since it increases the coupling between clients and servers, hampering service evolution. In practice, REST services are described through informal, ad-hoc and semi- structured documents, often written in natural language, which wors- ens the level of coupling. Most of the few REST service descriptions currently proposed follow an operation-centric approach with unclear additional benefits for developers and consumers. We propose a service description model focused on hypermedia allowing the generation of a graph that captures state transitions in an activity layer;wealsocapture resource, transition, and response semantics in a semantic layer. Using graph queries we traverse the graph and facilitate service discovery and composition. The service model was implemented as Microdata-based annotations, and a JSON description. A prototype was developed using Neo4J, and a set of real Web APIs was chosen to illustrate our approach. 1 Introduction The Web is an Internet-scale distributed hypermedia that provides a uniform way of accessing information through embedding action controls within the infor- mation retrieved from remote sites (i.e. representations). These features have made possible for the Web to evolve from a content-distribution platform to an application platform, and nowadays, to a distributed services platform, where functionality can be integrated into new services for massive consumption.
    [Show full text]
  • WEB SERVICES: PRINCIPLES and TECHNOLOGY Michael P
    WEB SERVICES: PRINCIPLES WEB SERVICES: PRINCIPLES AND TECHNOLOGY Michael P. Papazoglou “This book is one of the most comprehensive treatments of Web services I have seen. It covers the full gamut of concepts, principles, supporting technology and necessary infrastructure required to build a service-oriented architecture using today’s advanced standards. I highly recommend this book.” Dave Chappell: author, Enterprise Service Bus “This book, authored by one of the most respected experts in the Web services fi eld, is an invaluable reference for both academics and practitioners. Because of its rigor and completeness it is bound to become the defi nitive guide to Web services technologies.” AND Francisco Curbera: manager, Component Systems, IBM T.J. Watson Research Center TECHNOLOGY Web services represent the next generation of web-based technology. They allow new and improved ways for enterprise applications to communicate and integrate with each other and, as such, are having a profound effect on both the worlds of business and of software development. In this new book, Michael Papazoglou offers a comprehensive examination of Web services which gives you all you will need to know to gain a solid foundation in this area. This book will help you to understand: ● The nature of Web services – what they actually are ● The underlying concepts, principles, and methodologies of Web services ● The fundamental technologies that underpin the Web services paradigm ● How Web services are introduced into organizations, and how they are designed, deployed and used Michael P. Papazoglou Papazoglou Michael P. ● The key standards necessary for the development of Web services Web Services: Principles and Technology is suitable for computer science students and also for professionals who need an introduction to this area.
    [Show full text]
  • 16Th ICCRTS “Collective C2 in Multinational Civil-Military Operations”
    16th ICCRTS “Collective C2 in Multinational Civil-Military Operations” Title of Paper Adapting WS-Discovery for use in tactical networks Topic(s) Primary: Topic 9: Networks and Networking Alternatives: Topic 8: Architectures, Technologies, and Tools, Topic 6: Experimentation, Metrics, and Analysis Name of Author(s) Frank T. Johnsen and Trude Hafsøe Norwegian Defence Research Establishment (FFI) P.O. Box 25 2027 Kjeller, Norway Point of Contact Frank T. Johnsen Norwegian Defence Research Establishment (FFI) P.O. Box 25 2027 Kjeller, Norway [email protected] Abstract The NATO Network Enabled Capabilities (NNEC) feasibility study has identified Web services as a key enabling technology for NNEC. The technology is founded on a number of civil standards, ensuring interoperability across different operating systems and programming languages. This also makes the technology a natural choice for interoperability also in multinational civil-military operations, where a large number of heterogeneous systems need to exchange information. Web services provide loose coupling and late binding, which are desirable properties in such a setting. Discovering available services in an operation is essential, and the discovery process must leverage standards to ensure interoperable information exchange. WS-Discovery is a standard for Web services discovery suited for dynamic environments and civil networks, but has high overhead and is not so suitable for tactical networks. Like the other Web services standards, it uses XML for encoding messages. In civil networks bandwidth is abundant, but in tactical networks XML may incur unacceptable overhead. However, the W3C has created a specification for efficient XML interchange (EXI), which reduces XML overhead by defining a binary interchange format.
    [Show full text]
  • Paper Title (Use Style: Paper Title)
    Federated Single Sign On in Disconnected, Intermittent and Limited (DIL) Networks Marianne R. Brannsten Norwegian Defence Research Establishment (FFI) P O Box 25, NO-2027 Kjeller Abstract—In a military setting resource exchange amongst coalition partners is of great importance. Using SAML2.0 in a II. RELATED WORK Single Sign On scheme in a federated setting can be a solution to Earlier work has shown that it is possible to use Web Web authentication of Web resources. The problem of adding services in tactical networks [15]. Standards “out of the box” security in a potentially disconnected, intermittent and limited might not handle the additional challenges DIL environments (DIL) network environment is the security overhead. In this introduce, but by using specialized proxies, the technology paper tests are performed to measure this overhead, and the could work despite the DIL limitations. This lets us attain the results are evaluated. advantages of SOA using Web services on a tactical level. Keywords—Single Sign On(SSO); Enterprise; Federation; WS- Lund et al. [1] have proved this in their “Delay- and distruption Federation;SAML2.0 tolerant SOAP proxy”. Johnsen et al. [2] have shown that service discovery also can be brought into tactical networks using a discovery protocol translations enabled gateway I. INTRODUCTION solution. Both solutions bring Web services to the tactical In both operations and exercises, NATO needs to connect domain, but none of them are evaluated with use of relevant to coalition partners. FMN (Federated Mission Networking)[8] security standards. The work presented in this paper can by this is defined by NATO to enable information and service be viewed as orthogonal and complementary to this earlier exchange amongst coalition participants in such events.
    [Show full text]
  • Service Discovery in Hybrid Environments
    Service Discovery in Hybrid Environments Sabrina Alam Chowdhury Department of Informatics Faculty of mathematics and natural sciences UNIVERSITETET OF OSLO 01/08/2017 1 2 Service Discovery in Hybrid Environments 3 © 2017 Sabrina Alam Chowdhury Service Discovery in Hybrid Environments http://www.duo.uio.no/ Printed: Reprosentralen, University of Oslo 4 Abstract The thesis topic is based on Service discovery of heterogeneous Web services across hybrid environments. Here it also describes a clear definition of SOA and Web service with different standards to implement those services in different environments. Furthermore an analysis and survey of Web services standards also given in this thesis. An overview also discussed here that how different Web service discovery mechanism solution is currently available to discover services in different environments which include from cloud to non-cloud , non- cloud to cloud and other platforms with some research challenges on service discovery for SOAP and RESTful Web services. A prototype has been implemented as a proof of concept for enabling common service discovery for hybrid environments for different Web services. 5 6 Preface The thesis represents the final product of my master degree in Informatics at the University of Oslo. The work described herein is conducted under the supervision of Dr. Frank Trethan Johnsen and Cand. Scient. Trude Hafsøe Bloebaum. The thesis has been a long journey, and I would not have been able to complete it without the precious help and support given by various people. The learning curve of my career becomes so high, and I got to understand lots of interesting things while working on this thesis.
    [Show full text]
  • Web Service Discovery with Implicit Qos Filtering
    Web Service Discovery with Implicit QoS Filtering Natallia Kokash DIT - University of Trento, Via Sommarive, 14, 38050 Trento, Italy email: [email protected] Abstract. Web Service (WS) discovery is a critical problem hinder- ing web service technology proliferation. The current solution, based on catalog-style browsing, provides no control over the quality of registered services. Application of matching techniques for WS retrieval is still un- der investigation. The objective of this work is the design of a framework to improve WS discovery. Our approach is based on application of dis- tributed recommendation system to provide Quality of Service (QoS) information and on testing of retrieval methods on service specifications. 1 Introduction WS paradigm is a promising model of software technology, based on loosely coupled, distributed and independent services operating via the web infrastruc- ture. To overcome platform and language dependence, services are described using Web Service Description Language (WSDL). Standardized XML-based interfaces help performing service reuse. Service descriptions are cataloged in Universal Discovery, Description and Integration (UDDI) registries. Although there exists a stack of standards to regulate the communication of processes and automated tools to convert legacy applications into web services, WS technology is still not widely used. One of the reasons is the lack of means to support WS discovery, i.e., the identification of existing WSs that can be used by new web applications. This problem is rather extensive and admits various interpretations [4]. Under automated discovery, a requester agent performs service search and evaluates the results. Currently UDDI registries are the dominating technolog- ical basis for WS discovery.
    [Show full text]
  • Web Service: Been There, Done That?
    Wright State University CORE Scholar The Ohio Center of Excellence in Knowledge- Kno.e.sis Publications Enabled Computing (Kno.e.sis) 1-2003 Web Service: Been There, Done That? Steffen Staab Will van der Aalst V. Richard Benjamins Amit P. Sheth Wright State University - Main Campus, [email protected] John A. Miller Wright State University - Main Campus See next page for additional authors Follow this and additional works at: https://corescholar.libraries.wright.edu/knoesis Part of the Bioinformatics Commons, Communication Technology and New Media Commons, Databases and Information Systems Commons, OS and Networks Commons, and the Science and Technology Studies Commons Repository Citation Staab, S., van der Aalst, W., Benjamins, V. R., Sheth, A. P., Miller, J. A., Bussler, C., Maedche, A., Fensel, D., & Gannon, D. (2003). Web Service: Been There, Done That?. IEEE Intelligent Systems, 18 (1), 72-85. https://corescholar.libraries.wright.edu/knoesis/189 This Article is brought to you for free and open access by the The Ohio Center of Excellence in Knowledge-Enabled Computing (Kno.e.sis) at CORE Scholar. It has been accepted for inclusion in Kno.e.sis Publications by an authorized administrator of CORE Scholar. For more information, please contact [email protected]. Authors Steffen Staab, Will van der Aalst, V. Richard Benjamins, Amit P. Sheth, John A. Miller, Chistoph Bussler, Alexander Maedche, Dieter Fensel, and Dennis Gannon This article is available at CORE Scholar: https://corescholar.libraries.wright.edu/knoesis/189 Trends & Controversies
    [Show full text]
  • CICS TS for Z/OS: Using Web Services with CICS Chapter 1
    CICS Transaction Server for z/OS 5.5 Using Web Services with CICS IBM Note Before using this information and the product it supports, read the information in “Notices” on page 635. This edition applies to the IBM® CICS® Transaction Server for z/OS® Version 5 Release 5 (product number 5655-Y04) and to all subsequent releases and modifications until otherwise indicated in new editions. © Copyright International Business Machines Corporation 1974, 2020. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents About this PDF.....................................................................................................vii Chapter 1. CICS and web services..........................................................................1 CICS and SOAP web services ......................................................................................................................3 Message handlers and pipelines............................................................................................................4 SOAP nodes.......................................................................................................................................... 12 SOAP messages and the application data structure........................................................................... 12 WSDL and the application data structure............................................................................................15 WSDL and message exchange patterns...............................................................................................16
    [Show full text]
  • Service Oriented Architectures and Semantic Web Processes
    Wright State University CORE Scholar The Ohio Center of Excellence in Knowledge- Kno.e.sis Publications Enabled Computing (Kno.e.sis) 2004 Service Oriented Architectures and Semantic Web Processes Francisco Cubera Kunal Verma Amit P. Sheth Wright State University - Main Campus, [email protected] Follow this and additional works at: https://corescholar.libraries.wright.edu/knoesis Part of the Bioinformatics Commons, Communication Technology and New Media Commons, Databases and Information Systems Commons, OS and Networks Commons, and the Science and Technology Studies Commons Repository Citation Cubera, F., Verma, K., & Sheth, A. P. (2004). Service Oriented Architectures and Semantic Web Processes. https://corescholar.libraries.wright.edu/knoesis/62 This Tutorial is brought to you for free and open access by the The Ohio Center of Excellence in Knowledge-Enabled Computing (Kno.e.sis) at CORE Scholar. It has been accepted for inclusion in Kno.e.sis Publications by an authorized administrator of CORE Scholar. For more information, please contact [email protected]. Service Oriented Architectures and Semantic Web Processes Jorge Cardoso1, Francisco Curbera2, Amit Sheth3 1University of Madeira (Portugal) 2IBM T.J. Watson Research Center (USA) 3 LSDIS Lab, University of Georgia and Semagix, Inc (USA) 2 Service Oriented Architectures and Web Services Semantic Web Processes 2 3 Semantic Web Processes Part 3 Service Oriented Architectures and Web Services 5 Overview z IT for a new business model z Service Oriented Architectures (SOAs). z Web services as an XML based instantiation of SOA. z Protocols. z Metadata. z Discovery. z Composition. z Summary. 5 6 A New Business Environment z Business outsource every non-essential function.
    [Show full text]
  • Web Services: an Architectural Overview
    Web Services: An Architectural Overview Roseli Persson Hansen Cassia T. Santos Sérgio Crespo C. S. Pinto Guilherme L. Lanius Fernando Massen Email:{roseli,cassiats,crespo,speka,ferhr}@exatas.unisinos.br Post-Graduation InterSubjective Program in Applied Computing - PIPCA UNISINOS Abstract ture are described, such as some development plat- forms that are being deployed today. Then the Sec- Web Services represents an architectural structure tion 4 ends with an comparison between architecture that allows communication between applications. and platform proposals. The use of eXtensible Markup Language (XML)- based Technology allows exploitation of services without needing to know what platform or language 2 What is Web Services? was used to create those services. This document aims to offer an overview of the main Web Services are modularized applications that can approaches about Web Services architecture, stab- be described, published and invoked under a net- lishing what are the common points between them. work, commonly being WEB-based. I.e., Web Ser- vices are interfaces that describes an collection of operations that are accessible through the network 1 Introduction by throwing standard XML messages. Web Services allow serivce integration in an fast, effective way Web Services represent an architectural structure ([21, 8]). that allows communication between applications. A Web Service is a software component that in- An service can be invoked remotely or be used to depends on the implementation and platform. It can employ a new service together with another ser- be described using an service description language, vices. Beyond the basic Web Services structure, this published in a registry and discovered by an stan- paper will be presenting some standard technolo- dard mechanism.
    [Show full text]