Indexation automatique de documents
Un article de Wikipédia, l'encyclopédie libre. Un index est en toute généralité, une liste de descripteurs à chacun desquels est associée une liste des documents et/ou parties de documents auxquels ce descripteur renvoie. Ce renvoi peut être pondéré. Indexation de textes[modifier | modifier le code] Pour un texte, un index très simple à établir automatiquement est la liste ordonnée de tous les mots apparaissant dans les documents avec la localisation exacte de chacune de leurs occurrences ; mais un tel index est volumineux et surtout peu exploitable. L'indexation automatique tend donc plutôt à rechercher les mots qui correspondent au mieux au contenu informationnel d'un document. Il est évident que l’on ne peut pas garder ces mots à haute fréquence mais peu porteur de sens en terme. Une autre opération est ensuite couramment appliquée lors de l'indexation. Indexation d'images[modifier | modifier le code] On peut réaliser l'indexation des images de deux façons. Portail de l’informatique
List of social bookmarking websites
Defunct sites[edit] See also[edit] Notes and references[edit]
Google Guide Quick Reference: Google Advanced Operators (Cheat Sheet)
The following table lists the search operators that work with each Google search service. Click on an operator to jump to its description — or, to read about all of the operators, simply scroll down and read all of this page. The following is an alphabetical list of the search operators. This list includes operators that are not officially supported by Google and not listed in Google’s online help. Each entry typically includes the syntax, the capabilities, and an example. allinanchor: If you start your query with allinanchor:, Google restricts results to pages containing all query terms you specify in the anchor text on links to the page. Anchor text is the text on a page that is linked to another web page or a different place on the current page. allintext: If you start your query with allintext:, Google restricts results to those containing all the query terms you specify in the text of the page. allintitle: allinurl: In URLs, words are often run together. author: cache: define: ext: group:
Robot d'indexation
Un article de Wikipédia, l'encyclopédie libre. Pour les articles homonymes, voir Spider. Fonctionnant sur le même principe, certains robots malveillants (spambots) sont utilisés pour archiver les ressources ou collecter des adresses électroniques auxquelles envoyer des courriels. En Français, depuis 2013, crawler est remplaçable par le mot collecteur[1]. Il existe aussi des collecteurs analysant finement les contenus afin de ne ramener qu'une partie de leur information. Dès les années 1990, il a ainsi existé des comparateurs de prix automatiques, puis des comparateurs performance/prix pour les microprocesseurs[2]. Principes d'indexation[modifier | modifier le code] Pour indexer de nouvelles ressources, un robot procède en suivant récursivement les hyperliens trouvés à partir d'une page pivot. Un fichier d'exclusion (robots.txt) placé dans la racine d'un site Web permet de donner aux robots une liste de ressources à ignorer. Les robots du Web 3.0[modifier | modifier le code]
Web crawler
Not to be confused with offline reader. For the search engine of the same name, see WebCrawler. Crawlers can validate hyperlinks and HTML code. Overview[edit] A Web crawler starts with a list of URLs to visit, called the seeds. The large volume implies that the crawler can only download a limited number of the Web pages within a given time, so it needs to prioritize its downloads. The number of possible URLs crawled being generated by server-side software has also made it difficult for web crawlers to avoid retrieving duplicate content. Crawling policy[edit] The behavior of a Web crawler is the outcome of a combination of policies:[6] a selection policy that states which pages to download,a re-visit policy that states when to check for changes to the pages,a politeness policy that states how to avoid overloading Web sites, anda parallelization policy that states how to coordinate distributed web crawlers. Selection policy[edit] Restricting followed links[edit] URL normalization[edit]
Search Engine Directory
Society of Indexers
History[edit] The Society of Indexers was formally constituted at the premises of the National Book League in the UK on 30th March 1957 by G. Norman Knight and approximately 60 other people. He "count[ed] it as one of the achievements of the Society to have removed the intense feeling of solitude in which the indexer (of books and journals, at any rate) used to work Later members in various areas of the world grouped together and formed societies which are now affiliated Publications[edit] It started publishing its journal, The Indexer ISSN 0019-4131 (print) ISSN 1756-0632 (online), in 1958 which continues today and is the official journal of all the indexing societies. The society newsletter SIdelights is published quarterly and is only available to society members. Conferences[edit] Conferences are held, usually annually and in the UK. References[edit] External links[edit]
Crawl
From Wikipedia, the free encyclopedia Crawl or crawling may refer to: Music[edit] Television and film[edit] See also[edit]
wow
Tim Craven - Freeware
32-bit Windows packages (The self-extractors for these packages currently all require 16-bit support. In case of a "16-bit MS-DOS Subsystem" error message, consult the Microsoft help page at (In Windows Vista, running the self-extractors as administrator is recommended. Running one of the self-extractors as an ordinary user typically produces the useless error message C:\Users\username\Local\Temp\_INS0432. (An alternative to running a self-extractor as a program is to change the extension to , extract the contents, and run in the folder containing the extracted files.) (Using XP compatibility mode may also help with some problems.) (In Windows XP and Vista, the applications are best viewed with "Windows and Buttons" set to "Windows Classic Style".) (There are no specifically 64-bit versions of these programs, nor are there likely to be. Article on using TheW32: De Vorsey, K.L.; Elson, C.; Gregorev, N.P.; Hansen, J. 2006.
