Web service

Web search engine Software system for finding relevant information on the Web A search engine is a software system that provides hyperlinks to web pages, and other relevant information on the Web in response to a user's query. The user enters a query in a web browser or a mobile app, and the search results are typically presented as a list of hyperlinks accompanied by textual summaries and images. Users also have the option of limiting a search to specific types of results, such as images, videos, or news. For a search provider, its engine is part of a distributed computing system that can encompass many data centers throughout the world. There have been many search engines since the dawn of the Web in the 1990s; however, Google Search became the dominant one in the 2000s and has remained so. History Pre-1990s Link analysis eventually became a crucial component of search engines through algorithms such as Hyper Search and PageRank.[5][6] 1990s: Birth of search engines 2000s–present: Post dot-com bubble Russia

OGC Introduction OGC members are specifying interoperability interfaces and metadata encodings that enable real time integration of heterogeneous sensor webs into the information infrastructure. Developers will use these specifications in creating applications, platforms, and products involving Web-connected devices such as flood gauges, air pollution monitors, stress gauges on bridges, mobile heart monitors, Webcams, and robots as well as space and airborne earth imaging devices. OGC members have developed and tested the following candidate specifications. Observations & Measurements (O&M) - Standard models and XML Schema for encoding observations and measurements from a sensor, both archived and real-time. Please visit our OpenGIS® Specification page to view and comment on publicly available OGC Sensor Web Enablement Specifications. General Documentation Sensor Web Enablement Specification Links

Service Web Un article de Wikipédia, l'encyclopédie libre. Un service web (ou service de la toile[1]) est un programme informatique de la famille des technologies web permettant la communication et l'échange de données entre applications et systèmes hétérogènes dans des environnements distribués. Il s'agit donc d'un ensemble de fonctionnalités exposées sur internet ou sur un intranet, par et pour des applications ou machines, sans intervention humaine, de manière synchrone ou asynchrone. Le concept a été précisé et mis en œuvre dans le cadre de Web Services Activity[2], au W3C, particulièrement avec le protocole SOAP. Très grandes généralités sur un service web. Dans sa présentation la plus générale, un service web se concrétise par un agent, réalisé selon une technologie informatique précise, par un fournisseur du service. Il existe plusieurs technologies derrière le terme services web : Les Services Web de type Representational state transfer (REST)[modifier | modifier le code] Portail d’Internet

Understanding WSDL Aaron Skonnard Northface University October 2003 Applies to: Web Services Web Services Description Language (WSDL) 1.1 WS-I Basic Profile Version 1.0 XML Messaging XML Schema Summary: See the importance of WSDL in the overall Web services architecture, as it describes the complete contract for application communication. Contents Overview WSDL Basics Types Messages Interfaces (portTypes) Bindings Services WSDL Editors Where Are We? Overview XML makes it possible for developers to expose valuable resources in a highly interoperable fashion, where a resource is any type of application or data store used within an organization. Figure 1: Resources and services This architecture makes it possible for any consumer with XML support to integrate with Web service applications. A schema definition simply tells you what XML messages may be used but not how they relate to each other. A message exchange is also referred to as an operation. Figure 2: Messages and operations WSDL Basics <! Table 1. Types

Machine vision Early Automatix (now part of Microscan) machine vision system Autovision II from 1983 being demonstrated at a trade show. Camera on tripod is pointing down at a light table to produce backlit image shown on screen, which is then subjected to blob extraction. Machine vision (MV) is the technology and methods used to provide imaging-based automatic inspection and analysis for such applications as automatic inspection, process control, and robot guidance in industry.[1][2] The scope of MV is broad.[2][3][4] MV is related to, though distinct from, computer vision.[2] Applications[edit] The primary uses for machine vision are automatic inspection and industrial robot guidance.[5] Common machine vision applications include quality assurance, sorting, material handling, robot guidance, and optical gauging.[4] Methods[edit] Imaging[edit] Image processing[edit] After an image is acquired, it is processed.[19] Machine vision image processing methods include[further explanation needed] Outputs[edit]

Web scraping Web scraping, web harvesting, or web data extraction is data scraping used for extracting data from websites.[1] Web scraping software may access the World Wide Web directly using the Hypertext Transfer Protocol, or through a web browser. While web scraping can be done manually by a software user, the term typically refers to automated processes implemented using a bot or web crawler. It is a form of copying, in which specific data is gathered and copied from the web, typically into a central local database or spreadsheet, for later retrieval or analysis. Web scraping a web page involves fetching it and extracting from it.[1][2] Fetching is the downloading of a page (which a browser does when you view the page). Therefore, web crawling is a main component of web scraping, to fetch pages for later processing. Once fetched, then extraction can take place. Newer forms of web scraping involve listening to data feeds from web servers. History[edit] Techniques[edit] Human copy-and-paste[edit]

Constrained Application Protocol (CoAP) CoRE Working Group Z. Shelby Internet-Draft Sensinode Intended status: Standards Track K. Hartke Expires: December 30, 2013 C. Bormann Universitaet Bremen TZI June 28, 2013 Constrained Application Protocol (CoAP) draft-ietf-core-coap-18 Abstract The Constrained Application Protocol (CoAP) is a specialized web transfer protocol for use with constrained nodes and constrained (e.g., low-power, lossy) networks. The nodes often have 8-bit microcontrollers with small amounts of ROM and RAM, while constrained networks such as 6LoWPAN often have high packet error rates and a typical throughput of 10s of kbit/s. The protocol is designed for machine-to-machine (M2M) applications such as smart energy and building automation. [include full document text]

Liste des spécifications des services web WS-* Un article de Wikipédia, l'encyclopédie libre. Il existe une variété de spécifications associées aux Services Web WS-*. Ces spécifications sont à des niveaux de maturité parfois différents, et sont maintenus par diverses organisations de standardisation. Ces spécifications peuvent se compléter, se chevaucher, voire se concurrencer l'une l'autre. Les spécifications de ces Services Web sont aujourd'hui désignées sous le terme WS-*, certainement en raison du sigle WS- qui précède la majorité d'entre elles. Cette page liste la plupart des spécifications considérées comme faisant partie des WS-*. Web Services Activity, sur le site du W3C UDDI signifie Universal Description, Discovery, and Integration (UDDI 1.0, 2.0 et 3.0): Normalise l'architecture d'un annuaire distribué permettant de publier les interfaces des services Web (endpoint des contrats WSDL). XML (Extensible Markup Language)Espace de noms XMLXML SchemaXPathXML Information SetXIncludeXML Pointer WS-ReliableMessagingWS-Reliability

WSDL Example Given below is a WSDL file that is provided to demonstrate a simple WSDL program. Let us assume the service provides a single publicly available function, called sayHello. This function expects a single string parameter and returns a single string greeting. For example, if you pass the parameter world then service function sayHello returns the greeting, "Hello, world!". Example Contents of HelloService.wsdl file: Example Analysis Definitions : HelloServiceType : Using built-in data types and they are defined in XMLSchema.Message : sayHelloRequest : firstName parametersayHelloresponse: greeting return valuePort Type : sayHello operation that consists of a request and a response service.Binding : Direction to use the SOAP HTTP transport protocol.Service : Service available at : Associates the binding with the URI where the running service can be accessed.

RESTful Web services: The basics The basics REST defines a set of architectural principles by which you can design Web services that focus on a system's resources, including how resource states are addressed and transferred over HTTP by a wide range of clients written in different languages. If measured by the number of Web services that use it, REST has emerged in the last few years alone as a predominant Web service design model. In fact, REST has had such a large impact on the Web that it has mostly displaced SOAP- and WSDL-based interface design because it's a considerably simpler style to use. REST didn't attract this much attention when it was first introduced in 2000 by Roy Fielding at the University of California, Irvine, in his academic dissertation, "Architectural Styles and the Design of Network-based Software Architectures," which analyzes a set of software architecture principles that use the Web as a platform for distributed computing (see Resources for a link to this dissertation). Back to top Listing 1.

Web science From Wikipedia, the free encyclopedia Emerging interdisciplinary field Web science is an emerging interdisciplinary field concerned with the study of large-scale socio-technical systems, particularly the World Wide Web.[1][2] It considers the relationship between people and technology, the ways that society and technology co-constitute one another and the impact of this co-constitution on broader society. Web Science combines research from disciplines as diverse as sociology, computer science, economics, and mathematics.[3] An earlier definition was given by American computer scientist Ben Shneiderman: "Web Science" is processing the information available on the web in similar terms to those applied to natural environment.[4] The Web Science Institute describes Web Science as focusing "the analytical power of researchers from disciplines as diverse as mathematics, sociology, economics, psychology, law and computer science to understand and explain the Web. Areas of activity[edit]

LLNs RPL Representational State Transfer Un article de Wikipédia, l'encyclopédie libre. REST (representational state transfer) est un style d’architecture pour les systèmes hypermédia distribués, créé par Roy Fielding en 2000 dans le chapitre 5 de sa thèse de doctorat[1]. REST n’est pas un protocole (tel que HTTP) ou un format. Ce style d'architecture est particulièrement bien adapté au World Wide Web mais n'en est pas dépendant. Les contraintes, telles que définies par Roy Fielding, peuvent s'appliquer à d'autres protocoles d'application que HTTP. Contraintes d'une architecture REST[modifier | modifier le code] Les contraintes sont les suivantes : Client-serveur : les responsabilités sont séparées entre le client et le serveur. Description de REST[modifier | modifier le code] Confusion entre REST et protocoles[modifier | modifier le code] RPC ainsi que SOAP ne sont pas des styles d'architecture mais des protocoles. Avantages de REST[modifier | modifier le code] Inconvénients de REST[modifier | modifier le code]