A Web service (WS*-) is a software system designed to support interoperable machine-to-machine
interaction over a network (WSDL) i.e between a client and a service. It has an interface described in a
machine-processable format . Other systems interact with the Web service in a manner prescribed by its
description using SOAP messages which is a protocol define by world wide web consortium, typically
conveyed using HTTP with an XML serialization in conjunction with other Web-related standards. Windows
Communication Foundation (WCF) is a framework for building service-oriented applications. Using WCF,
you can send data as asynchronous messages from one service endpoint to another. A service endpoint can
be part of a continuously available service hosted by IIS, or it can be a service hosted in an application like
an .exe file. An endpoint can be a client of a service that requests data from a service endpoint. The messages
can be as simple as a single character or word sent as XML document, or as complex as a stream of binary
data. In this paper ,We gave the Adavantages that are Available by using wcf ,instead of webservices and
other.
This article provides a brief introduction to the two styles of web-services interaction and details the benefits and challenges associated with each one.
Introduction to Service Oriented Architectures, SOAP/WSDL Web Services and RE...ecosio GmbH
In this guest talk, held as part of the Web Engineering lecture series at Vienna University of Technology, we give an overview of the current state of the art in the domain of Web Services.
In the first part we dwell on the main principles of Service Oriented Architectures (SOA), followed by an introduction of the three core standards SOAP, WSDL, as well as UDDI. Furthermore, we briefly cover the Java API for XML Web Services (JAX-WS).
In the second part we focus on principles of RESTful Web Services and the Java API for RESTful Web Services. The lecture is accompanied by practical examples, which are also available on GitHub.
Performance Evaluation of Web Services In Linux On MulticoreCSCJournals
Contemporary Business requires the ability to seamlessly exchange information between internal
business units, customers, and partner, is vital for success. Most organizations employ a variety of
different applications to store and exchange data in dissimilar way and therefore cannot “communicate” to
one another productively [1]. Service Oriented Architecture (SOA) components provide services to other
components via communication protocols typically over a network [2].The technologies like DCOM, RMI,
COBRA, Web Services etc. are developed using SOA, which contributed best to fulfill requirements to
some extent, but components result from these technologies are mostly either language specific or
platform specific,[3]. The services or components developed for one platform may not be able to
communicate and reusable in other platform, as they are mostly language specific or platform specific.
“World Wide Web Consortium (W3C) International community to develop web standards” issued WS-*
specifications for programming language vendors for Web services, which confirms a standard means of
interoperating between different software applications running on a variety of platforms or frameworks
[4][5]. This paper tests web services performance gain along with interoperability, reusability by using
“NAS Parallel Benchmarks (NPB)” set of program [6] developed by NASA Advanced Supercomputing
Division to evaluate the performance of supercomputers.
A Web service (WS*-) is a software system designed to support interoperable machine-to-machine
interaction over a network (WSDL) i.e between a client and a service. It has an interface described in a
machine-processable format . Other systems interact with the Web service in a manner prescribed by its
description using SOAP messages which is a protocol define by world wide web consortium, typically
conveyed using HTTP with an XML serialization in conjunction with other Web-related standards. Windows
Communication Foundation (WCF) is a framework for building service-oriented applications. Using WCF,
you can send data as asynchronous messages from one service endpoint to another. A service endpoint can
be part of a continuously available service hosted by IIS, or it can be a service hosted in an application like
an .exe file. An endpoint can be a client of a service that requests data from a service endpoint. The messages
can be as simple as a single character or word sent as XML document, or as complex as a stream of binary
data. In this paper ,We gave the Adavantages that are Available by using wcf ,instead of webservices and
other.
This article provides a brief introduction to the two styles of web-services interaction and details the benefits and challenges associated with each one.
Introduction to Service Oriented Architectures, SOAP/WSDL Web Services and RE...ecosio GmbH
In this guest talk, held as part of the Web Engineering lecture series at Vienna University of Technology, we give an overview of the current state of the art in the domain of Web Services.
In the first part we dwell on the main principles of Service Oriented Architectures (SOA), followed by an introduction of the three core standards SOAP, WSDL, as well as UDDI. Furthermore, we briefly cover the Java API for XML Web Services (JAX-WS).
In the second part we focus on principles of RESTful Web Services and the Java API for RESTful Web Services. The lecture is accompanied by practical examples, which are also available on GitHub.
Performance Evaluation of Web Services In Linux On MulticoreCSCJournals
Contemporary Business requires the ability to seamlessly exchange information between internal
business units, customers, and partner, is vital for success. Most organizations employ a variety of
different applications to store and exchange data in dissimilar way and therefore cannot “communicate” to
one another productively [1]. Service Oriented Architecture (SOA) components provide services to other
components via communication protocols typically over a network [2].The technologies like DCOM, RMI,
COBRA, Web Services etc. are developed using SOA, which contributed best to fulfill requirements to
some extent, but components result from these technologies are mostly either language specific or
platform specific,[3]. The services or components developed for one platform may not be able to
communicate and reusable in other platform, as they are mostly language specific or platform specific.
“World Wide Web Consortium (W3C) International community to develop web standards” issued WS-*
specifications for programming language vendors for Web services, which confirms a standard means of
interoperating between different software applications running on a variety of platforms or frameworks
[4][5]. This paper tests web services performance gain along with interoperability, reusability by using
“NAS Parallel Benchmarks (NPB)” set of program [6] developed by NASA Advanced Supercomputing
Division to evaluate the performance of supercomputers.
Project - UG - BTech IT - Cluster based Approach for Service Discovery using ...Yogesh Santhan
Abstract— Web services that are appropriate to a user specific request are usually not considered in discovering the exact service since they are present without explicit related semantic descriptions. In our approach, we deal with the issue of service discovery provided non-explicit service description semantics that match a particular service request. We propose a system that involves semantic-based service categorization which is performed at the UDDI with a key for achieving the service categorization at functional level based on an ontology skeleton. Also, clustering is used for literally systemizing the web services based on functionality which is achieved by using analytic algorithm. An efficient matching for the relevant services is achieved by the enhancing the service request semantically and involves expanding the additional functionality (obtained from ontology) that are related for the requested service. The pattern recognition algorithm is used to select appropriate service from the cluster formation of related (grouped) web services.
This is my UG Final Year Project - BTech Information Technology.
WEB SERVICES COMPOSITION METHODS AND TECHNIQUES: A REVIEWijcseit
Web Services are modular, self-describing, self-contained and loosely coupled applications that can be
published, located, and invoked across the web. With the increasing number of web services available on
the web, the need for web services composition is becoming more and more important. Nowadays, for
answering complex needs of users, the construction of new web services based on existing ones is required.
This problem is known as web services composition. However, it is one of big challenge problems of recent
years in a distributed and dynamic environment. The various approaches in field of web service
compositions proposed by the researchers. In this paper we present a review of existing approaches for
web service composition and compare them among each other with respect to some key requirements. We
hope this paper helps researchers to focus on their efforts and to deliver lasting solutions in this field.
Project - UG - BTech IT - Cluster based Approach for Service Discovery using ...Yogesh Santhan
Abstract— Web services that are appropriate to a user specific request are usually not considered in discovering the exact service since they are present without explicit related semantic descriptions. In our approach, we deal with the issue of service discovery provided non-explicit service description semantics that match a particular service request. We propose a system that involves semantic-based service categorization which is performed at the UDDI with a key for achieving the service categorization at functional level based on an ontology skeleton. Also, clustering is used for literally systemizing the web services based on functionality which is achieved by using analytic algorithm. An efficient matching for the relevant services is achieved by the enhancing the service request semantically and involves expanding the additional functionality (obtained from ontology) that are related for the requested service. The pattern recognition algorithm is used to select appropriate service from the cluster formation of related (grouped) web services.
This is my UG Final Year Project - BTech Information Technology.
WEB SERVICES COMPOSITION METHODS AND TECHNIQUES: A REVIEWijcseit
Web Services are modular, self-describing, self-contained and loosely coupled applications that can be
published, located, and invoked across the web. With the increasing number of web services available on
the web, the need for web services composition is becoming more and more important. Nowadays, for
answering complex needs of users, the construction of new web services based on existing ones is required.
This problem is known as web services composition. However, it is one of big challenge problems of recent
years in a distributed and dynamic environment. The various approaches in field of web service
compositions proposed by the researchers. In this paper we present a review of existing approaches for
web service composition and compare them among each other with respect to some key requirements. We
hope this paper helps researchers to focus on their efforts and to deliver lasting solutions in this field.
A distributed system is a collection of computational and storage devices connected through a communications network. In this type of system, data, software, and users are distributed.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
20 Comprehensive Checklist of Designing and Developing a WebsitePixlogix Infotech
Dive into the world of Website Designing and Developing with Pixlogix! Looking to create a stunning online presence? Look no further! Our comprehensive checklist covers everything you need to know to craft a website that stands out. From user-friendly design to seamless functionality, we've got you covered. Don't miss out on this invaluable resource! Check out our checklist now at Pixlogix and start your journey towards a captivating online presence today.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Sudheer Mechineni, Head of Application Frameworks, Standard Chartered Bank
Discover how Standard Chartered Bank harnessed the power of Neo4j to transform complex data access challenges into a dynamic, scalable graph database solution. This keynote will cover their journey from initial adoption to deploying a fully automated, enterprise-grade causal cluster, highlighting key strategies for modelling organisational changes and ensuring robust disaster recovery. Learn how these innovations have not only enhanced Standard Chartered Bank’s data infrastructure but also positioned them as pioneers in the banking sector’s adoption of graph technology.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
How to Get CNIC Information System with Paksim Ga.pptxdanishmna97
Pakdata Cf is a groundbreaking system designed to streamline and facilitate access to CNIC information. This innovative platform leverages advanced technology to provide users with efficient and secure access to their CNIC details.
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
GraphSummit Singapore | The Art of the Possible with Graph - Q2 2024Neo4j
Neha Bajwa, Vice President of Product Marketing, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
UiPath Test Automation using UiPath Test Suite series, part 6DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 6. In this session, we will cover Test Automation with generative AI and Open AI.
UiPath Test Automation with generative AI and Open AI webinar offers an in-depth exploration of leveraging cutting-edge technologies for test automation within the UiPath platform. Attendees will delve into the integration of generative AI, a test automation solution, with Open AI advanced natural language processing capabilities.
Throughout the session, participants will discover how this synergy empowers testers to automate repetitive tasks, enhance testing accuracy, and expedite the software testing life cycle. Topics covered include the seamless integration process, practical use cases, and the benefits of harnessing AI-driven automation for UiPath testing initiatives. By attending this webinar, testers, and automation professionals can gain valuable insights into harnessing the power of AI to optimize their test automation workflows within the UiPath ecosystem, ultimately driving efficiency and quality in software development processes.
What will you get from this session?
1. Insights into integrating generative AI.
2. Understanding how this integration enhances test automation within the UiPath platform
3. Practical demonstrations
4. Exploration of real-world use cases illustrating the benefits of AI-driven test automation for UiPath
Topics covered:
What is generative AI
Test Automation with generative AI and Open AI.
UiPath integration with generative AI
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
zkStudyClub - Reef: Fast Succinct Non-Interactive Zero-Knowledge Regex ProofsAlex Pruden
This paper presents Reef, a system for generating publicly verifiable succinct non-interactive zero-knowledge proofs that a committed document matches or does not match a regular expression. We describe applications such as proving the strength of passwords, the provenance of email despite redactions, the validity of oblivious DNS queries, and the existence of mutations in DNA. Reef supports the Perl Compatible Regular Expression syntax, including wildcards, alternation, ranges, capture groups, Kleene star, negations, and lookarounds. Reef introduces a new type of automata, Skipping Alternating Finite Automata (SAFA), that skips irrelevant parts of a document when producing proofs without undermining soundness, and instantiates SAFA with a lookup argument. Our experimental evaluation confirms that Reef can generate proofs for documents with 32M characters; the proofs are small and cheap to verify (under a second).
Paper: https://eprint.iacr.org/2023/1886
GraphSummit Singapore | The Future of Agility: Supercharging Digital Transfor...Neo4j
Leonard Jayamohan, Partner & Generative AI Lead, Deloitte
This keynote will reveal how Deloitte leverages Neo4j’s graph power for groundbreaking digital twin solutions, achieving a staggering 100x performance boost. Discover the essential role knowledge graphs play in successful generative AI implementations. Plus, get an exclusive look at an innovative Neo4j + Generative AI solution Deloitte is developing in-house.
Climate Impact of Software Testing at Nordic Testing DaysKari Kakkonen
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
Climate Impact of Software Testing at Nordic Testing Days
Semantic Web Services (Standards, Monitoring, Testing and Security)
1. Semantic Web Services (Standards, Monitoring, Testing and Security) Department of Engineering-Information Technology Presented by : Reza Ghanbari 2010
2. Outline Introduction of Web Service Semantic Web Services Introduction Life Cycle Foundation Standards of Web Service HTTP WSDL SOAP UDDI Foundation Standards of Semantic Web Service OWL-S OWL-S Virtual Machine Monitoring of Semantic Web Service Security of Semantic Web Service Message Level Protection Message Privacy Parameter Checking Authentication Authorization Conclusion of Semantic Web Services References
8. Problems of Web Services Descriptions are syntactic It says nothing (in machine - interpretable form) about what the software system does, or what sequence of messages is used to interact with it. All tasks associated with web services application development have to be carried out by humans like discovery, composition and invocation Problems of scalability
10. Semantic Web Services Semantic Web Technology Machine readable data Ontological basis Applied to Web Services Technology Reusable computational resources To automate all aspects of application development through reuse
11. Semantic Web Services Concepts Service Service Provider & Requester Concrete Service A specific performance of actions at a given time by one party for another Service Description A computational machine-readable representation of the service, in terms of the value which it provides Abstract Service Description Concrete Service Description
12. S.W.S. Concepts[1] Agents Software components which represent the parties as agents for the online presence as well as the automated representation Service Provider Agent Service Requester Agent Act as representatives online on behalf of some party
13. S.W.S. Concepts[2] Communication An online service interaction between the Service Provider Agent and the Requester Agent to exchange of messages according to a certain protocol known by both the parties Choreography A communication protocol among multiple parties during the automated online services Determines the constraints on the ordering of messages sent Grounding One or more communication endpoints to send and receive the messages according to some transport protocol Orchestration A specification of an agent to provide type as well as sending time of a message
14. S.W.S. Concepts[3] Mediation Data Mediation Consists of transforming from one syntactic format to another which may expect different syntactic formats of the messages provided by different Service Provider Agents Ontology Mediation Is used to make different choices based on the vocabulary when two parties describe services Reasoning One party is to reason with a description produced by the other party Some additional reasoning will be necessary to translate between the two approaches Protocol Mediation Reconciles the two different design of the interaction choreographies Translating a message sequence into a different message sequence to accomplish the same end Process Mediation Reconciles the differences in the internal processes at the side of each party The hardest form of mediation ( may impossible without engaging in process re-engineering)
15. S.W.S. Concepts[4] If the messages and choreographies are annotated semantically, then the mediation is possible automatically
17. S.W.S. Concepts[6] Service Modeling Phase Outset of the discovery phase Service Requester prepares a description of the service what is interested in receiving Service Providers create abstract service descriptions representing the service in which can be provided
18. S.W.S. Concepts[7] Service Discovery Phase Matching Compatibility of the requirement description and the offer description Centralized Service Discovery SMEP (Simple Message Exchange Protocol) During discovery, a requester may identify several providers which are potentially able to meet their needs
19. S.W.S. Concepts[8] Service Definition Phase The conversation among the Service Requester and one or more contacted as well as identified Service Providers Random Selection Analysis Selection Service Requester and Provider have agreed a service to be delivered, when the phase is successfully completed between two parties
20. S.W.S. Concepts[9] Service Delivery Phase It can take place ; Immediately while after service definition has been completed entirely off-line involve communication between the two parties It is again organized by an interaction choreography by; Service Delivery Monitoring Cancellation
21. Foundation Standards of Web Service Hypertext Transfer Protocol (HTTP) Communication Protocol to achieve interoperability via the web based on a set of standards built directly upon it regardless of their choice of platform or programming language Benefits: HTTP is everywhere Firewalls normally allow HTTP traffic
22. Foundation Standards of Web Service Web Service Description Language (WSDL) Is an XML-based language since ; It is a pure text format It is platform independent, It can be easily parsed by any programming language It is fairly easy to read Describes the service including the service name, functions, input and output parameters
23. Foundation Standards of Web Service Simple Object Access Protocol (SOAP) Its significant lies in its relationship with HTTP Platform and language independent based on XML Communication between applications via Internet format of the sending messages W3C recommendation Simple and extensible Allows to get around firewalls
25. Foundation Standards of Web Service Universal Description, Discovery and Integration (UDDI) UDDI is an XML-based standard for describing, publishing, and finding Web services. It is a specification for a distributed registry of Web services platform independent, open framework It can communicate via SOAP, CORBA, Java RMI Protocol It uses WSDL to describe interfaces to web services Open industry initiative Parts: A registry of all a web service's metadata A set of WSDL port type definitions
26. Why add semantics to Web Services? Better Reuse Semantic descriptions of services to help find relevant services Better Interoperability Beyond syntax to semantics, mapping of data exchanged between the services Configuration/Composition Enable dynamic binding of partners Some degree of automation across process lifecycle Process Configuration Process Execution
27. Foundation Standards of Semantic Web Services Semantic Annotation for WSDL and XML Schema (SAWSDL) Standard finished in 2007 Annotating WSDL with semantic information Built on existing Web Services standards using only extensibility elements Mechanism independent of the semantic representation language Provides means for mapping data between different Web Services
28.
29. Foundation Standards of Semantic Web Services SAWSDL Extensibility attributes modelReference Association between a WSDL component and a concept in some semantic model Annotations WSDL components WSDL Type Definitions liftingSchemaMapping Mappings between WSDL Type Definitions and semantic data loweringSchemaMapping Mappings between semantic data and WSDL Type Definitions
30. Foundation Standards of Semantic Web Services SAWSDL Annotation of the operation element Carries a reference to a concept in a semantic model that provides a high level description of the operation Annotation of the interface element Provides a reference to a concept or concepts in a semantic model
31. Foundation Standards of Semantic Web Services SAWSDL Tools SAWSDL4J Java API for manipulating and creating annotated SAWSDL documents WSMO Studio Semantic Web Service and Semantic Business Process modeling environment Set of Eclipse plugins Radiant WSDL-S/SAWSDL Annotation Tool Eclipse plug-in
32. OWL-S Ontology Web Language for Services Represents an upper ontology for the description of Semantic Web Services expressed in OWL It is a Semantic Web Services description language, expressed in OWL which describes the properties and capabilities of Web services Covers areas as; Web services capability-based search and discovery, Specification of service requester and provider interactions Service execution
33. OWL-S Virtual Machine The OWL-S Virtual Machine (OVM) A generic OWL-S processor A generic execution engine Executes the Process Model of a given service During the execution, processes inputs of Service Requester and outputs returned by the Service Providers, realizes the control and data flow of the composite Process Model, uses the Grounding to invoke WSDL based web services when needed.
34. Monitoring[1] During the process model execution What exactly should be monitored? Clear semantics of the process model Which model should be chosen? Analyzing the process model and the grounding (It is possible to identify important events that might be monitored) Event Types Process Call Inputs Assignment Outputs Processing Preconditions evaluation (Conditional) result evaluation Control construct execution Grounding events Failures and erroneous events
35. Monitoring[2] Event types are derived only from the logic of the process model and therefore can be used in any application Event types are neutral to the purpose for which they can be used Process Call Start events are associated with input values and end events additionally with produced output values and effects. A simple and a composite process represent decomposition of a process into subprocesses while an atomic process represents an execution of an existing web service operation
36. Monitoring[3] Inputs assignment Input values of processes can be provided either by the user (client) of the process model or by the data binding that is used Outputs Processing Outputs of atomic processes are obtained as a result of the service execution which is covered by the process call event type For simple and composite processes a new event type is needed to represent that the output value of the process is obtained from some output data binding
37. Monitoring[4] Preconditions evaluation Represents process of the preconditions evaluation with variables values assigned and with the true or false status (Conditional) result evaluation Represents an evaluation of a result comprising the grounded inCondition, produced effects and output bindings. A special event type represents a situation when no result can be applied which can be failed for all conditional results.
38. Monitoring[5] Control construct execution For each control construct one event type represents its start and one its end For control constructs whose execution depends on an expression evaluation (if-then-else, repeat-while, repeat-until) the information representing this expression evaluation and the branch chosen is included in the starting event type
39. Monitoring[6] WSDL grounding events Defines mappings of atomic processes to WSDL operations and of inputs and outputs to WSDL messages and message parts Failures and erroneous events For different categories of errors specific event types are defined
40. Web Services Security Background Standards are proposed or accepted regarding authentication, encryption, and identity management RSA ,Hash Functions and Digital Signature Algorithms Fundamental areas Message level protection Message privacy Parameter checking Authentication Authorization XML signatures SAML – Security Assertion Markup Language
41. Web Services Security RSA Used for any public/private key pair Properties: E(P, E(M,P)) M E(P, E(M,P)) M Where M is Sent Message and P is the Public Key Hash/Digest Functions message dependent Digital Signature Used for Authentication , Data Integrity and Non-Repudiation
42. Message Level Protection Message Integrity A provider gets the hashed message which is created by SHA-1 Algorithm , Then creates the digest again and compares with the one from the sender to verify the integrity of the messages
43. Message Privacy Confidential Message Message header has token and signature Typically WS are chained together to form a complex service end-to-end encryption schemes unlike SSL Solution: XML encryption
44. Parameter Checking Message validity To ensure the contents of a message are appropriate to the service and well formed To prevent the SQL injection attack , look for “ ; “ syntax
45. Authentication Verifying that the requester is who he/she claims to be E.g. user name / password Send credential by issuing certificates to the trusted authorities
46. Authorization Takes place after authentication and grantees the rights of accessing Access Control Implementations Access matrix Access Control List (ACL) Role Based Access Control (RBAC)
47. Authorization (Access Control Implementations) Access matrix Subject: An entity capable of accessing objects. The concept of subject equates that of a process Object: Anything to which access is controlled. E.g. files, programs, segments of memory Access right: The way in which an object is accesses by the subject. Examples: read, write, and execute Access Control List (ACL) Access matrix can be decomposed by columns, yielding access control lists For each object, it lists the users and their permitted access rights It may also have a default or public entry to covers subjects that are not explicitly listed Elements of the list may include individual as well group of users
48. Authorization (Access Control Implementations) Role Based Access Control (RBAC) Reference model Objects, Operations, Permissions, Roles and Users (in-band artifacts) System and Administrative model System functionality, Administrative operations and reviews Permission to access a resource Defines Roles and assigning permissions to Roles NOTE: OWL-S should map Users, Roles, Groups etc. to the ontology
49. Conclusion of Semantic Web Services It is becoming an important and integral part of the Web (including intranets) It aims to provide an expressive, comprehensive framework for handling activities on the Web Enabling the use of agents on the Web Many tools and applications exist today; mostly prototype It is an active research area Strong interest and many paths to adoption also exist like the standards path
50. References Introduction to the Semantic Web and Semantic Web Services, by Liyang Yu Semantic Web Services Concepts, Technologies, and Applications by Rudi Studer, Stephan Grimm, Andreas Abecker (Eds.) J. Kopecky, C. Bournez, and E. Prud’hommeaux, “Semantic annotations forwsdl working group,” 2007 http://www.w3.org/2002/ws/sawsdl/ R. Akkiraju and B. Sapkota, “Semantic annotations for wsdl and xml schema usage guide,” 2007 http://www.w3.org/TR/sawsdl-guide/ K. Verma and A. Sheth, “Using sawsdl for semantic service interoperability,”2007. http://lists.w3.org/Archives/Public/www-archive/2007May/att0081/SAWSDLSTC07-May21.pdf “Sawsdl4j,” http://www.schneier.com/essay-037.pdf “Wsmo studio,” http://www.wsmostudio.org “Radiant,” http://lsdis.cs.uga.edu/ Adding Semantics to Web Services Standards, by KaarthikSivashanmugam, KunalVerma, AmitSheth, John Miller SAWSDL: Semantic Annotations for WSDL and XML Schema, by JacekKopecky, Tomas Vitvar, CarineBournez and Joel Farrell Semantic Web Services Monitoring: An OWL-S based Approach, by Roman Vaculín, KatiaSycara Specifying and Monitoring Composite Events for SemanticWeb Services, by Roman Vaculín, KatiaSycara Web Service Security Management Using Semantic Web Techniques, by Diego ZuquimGuimarães Garcia , Maria Beatriz Felgar de Toledo Authorization and Privacy for Semantic Web Services, by LalanaKagal and Tim Finin, NaveenSrinivasan, and KatiaSycara, SRI International
Web Services technologies are working towards an environment where organizations can make some of their abilities accessible via the Internet. Web Service technology provides a standard and widely accepted way of defining these interfaces
This is done by ‘wrapping’ some computational capability with a Web Service interface, and allowing other organizations to locate it (via UDDI) and interact with it (via WSDL). Hence, Web Service technology allows the description of an interface in a standard way,
Scalability in expansion of scaling the capabilities in geographic location scale in administration of scaling
The Semantic Web Services vision is to combine Web Services as well as Semantic Web technologies and through this to enable automatic and dynamic interaction between software systems.
We can annotate software being offered via Web Service interfaces with machine interpretable descriptions describing what and how the software does (namely the service it provides a potential user). Furthermore, with ontologies able to describe the services that can be provided, we can bring about ‘advertising’ of services in a way which is both rich and machine-interpretable. This allows more sophisticated discovery of services than is currently possible with UDDI.
Service-Providerprovides a service to a Service-Requester when the first party does something for the benefit of the secondTo describe services, the Semantic Web approach uses techniques based on knowledge representationService Description : When describing a service, there are two key design decisions which must be made initially. First, what formal language is going to be used to describe it? Should it be described using horn clause logic, description logic, non-monotonic logic or some other approach?Secondly, what specific concepts and relations are going to be permitted in descriptions? what is the meaning of these?
Hence, the agent property is a role the component takes, rather than some intrinsic property of the component.Often, they will be reactive not proactive, and will be hardwired to follow some pre-determined process.
Grounding : When two parties engage in a conversation, they must each have one or more communication endpoints to send and receive the messages according to some transport protocol. This is referred to as the grounding of the choreography.Orchestration :NOTE: the choreography specifies what is permitted of both parties, while an orchestration specifies what each party will actually do.
Reasoning : if one party is to reason with a description produced by the other party, then some additional reasoning will be necessary to translate between the two approaches. This additional reasoning is termed ontology mediationProtocol : Two components which are to interact with each other may each have been designed with a particular interaction choreography in mind. Unless agreement was reached between the two designers (either directly or indirectly through the adoption of a standard) then it is unlikely that the two choreographies will be identical. Process :Behind any interaction, each party has some internal process which manages the reasoning and resources necessary to bring about that interaction. Like business processIn some cases, even though the two parties are able to interact via some protocol, there may be some difference between their processes which means this interaction will not succeed.
It is key to enabling service interaction to take place automatically
Because all details of the service will be known at the outset (e.g., the provider of the service is not known, and the cost of the service may not be known), the description will be of an abstract service. This abstract service description makes up the service requirement description of the service requester.
Centralized Service Discovery:The most common Centralized Discovery ‘Service’ is a which is contacted by the requester using a Simple Message Exchange Protocol
Random And Analysis Selection: the Selection of which to contact may simply be random, or may involve some analysis of the service providers and choice of which appear in some sense ‘best’
1-When the definition of a service has been agreed, then service delivery can take place ……End: If communication takes place, this is again governed by an interaction choreographyService delivery choreography : covers the exchange of messages associated directly with the delivery of the serviceMonitoring choreography : covers the exchange of messages which allow the service requester to receive information regarding the progress of the service from the providerCancellation/renegotiation choreography: allows the service requester, in certain circumstances, to cancel or alter the service which they are receiving from the provider
HTTP is everywhere — any machine that can run a Web browser supports HTTP because a Web browser’s protocol is HTTP.Firewalls normally allow HTTP traffic; in other words, you can use HTTP to talk to any machine.
WSDL : In other words, it is an advertisement of the service you provide. .
It defines a standard protocol specifying how one application should communicate and exchange data with another one over the Internet
UDDI is an open industry initiative enabling businesses to discover each other and define how they interact over the Internet.Parts: i) A registry of all a web service's metadata including a pointer to the WSDL description of a serviceii) A set of WSDL port type definitions for manipulating and searching that registry
Process Configuration (Discovery and Constraint analysis)Process Execution (Addressing run time heterogeneities like data heterogeneities.)
The Web Services Description Language (WSDL) with Semantic Annotations for WSDL and XML Schema (SAWSDL). The figure shows WSDLcomponents and the SAWSDL annotations that point to semantic concepts for specifying semantics or to schema mappings of data transformations
Annotation of the operation element specifies its behavioral aspects or includes other semantic definitionsAnnotation of the interface elementdescribes the Interface
A tool for execution of OWL-S web services must be able to interpret the Process Model of the service according to its semantics and provide a generic mechanism for invocation of web services represented as atomic processes in the Process Model. OWL-S processor that allows Web services and clients to interact on the basis of the OWL-S description of the Web service and OWL ontologiesexecution engine which can be used to develop applications that need to interact with OWL-S web servicesExecutes the Process Model by going through the Process Model while respecting the OWL-S operational semantics and invoking individual services represented by atomic processes.
Process Call Presents probably the most important event type. For each process type specific event types are defined representing its start and end.
Process Call Presents probably the most important event type. For each process type specific event types are defined representing its start and end. output data binding means the dataflow of the process model specifies that the output is produced by some previous processes).
NOTE : This is application layer security (not network layer security)
XML encryption allows for encryption of any combination of the message body, header, attachments, and sub-structures
SQL injection is a common malicious code. Typical identification method is to look for “;’ (semicolon) that allows for SQL commands to follow.
If the sender previously unknown: send credential to verify oneself.
In any organization, data located may have levels of sensitivity
Access Matrix A general model of access control as exercised by a file or database management system is that of an access matrix
handling activities on the WebEnables greater automation of discovery, selection, invocation, composition, monitoring, and other service management tasksEnabling the use of agents on the WebSimplicity and widespread adoption of WS building blocks are enablers