Metadata for Web Resources: How Metadata Works on the Web.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	Dillon, Martin
Format:	Recurso educativo Open Access
Language:	en
Published:	2000
Subjects:	Access to Information Cataloging Knowledge Representation Library Role Metadata Standards World Wide Web
Online Access:	Acceder al recurso
Tags:	Add Tag No Tags, Be the first to tag this record!

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author	Dillon, Martin
author_facet	Dillon, Martin Dillon, Martin
collection	Education Resources Information Center
contents	Metadata for Web Resources: How Metadata Works on the Web. Dillon, Martin Access to Information Cataloging Knowledge Representation Library Role Metadata Standards World Wide Web This paper discusses bibliographic control of knowledge resources on the World Wide Web. The first section sets the context of the inquiry. The second section covers the following topics related to metadata: (1) definitions of metadata, including metadata as tags and as descriptors; (2) metadata on the Web, including general metadata systems, resource description, PICS (Platform for Internet Content Selection) and other content controllers, the BizTalk and SOAP (Simple Object Access Protocol) frameworks, and rights management; and (3) the resource description framework, including the future of XML (eXtensible Markup Language). The third section addresses issues related to the Dublin Core metadata standard, including degree of completeness, institutional support, implementation, extensibility rules, and difficulties with the creator and relation elements. This section also considers difficulties with the object-attribute model. The fourth section discusses the role of libraries in Web resource description, including reasons why searching alone will not replace the need for human cataloging in the near future. The fifth section presents recommendations related to the following three options for libraries to provide access to knowledge resources on the Web: use or adapt MARC/AACR2; create a library metadata system with the same aims as the Dublin Core; or use or adapt the Dublin Core. Several relevant Web sites are listed. (MES)
format	Recurso educativo Open Access
id	eric_ED454856
institution	ERIC Institute of Education Sciences
language	en
publishDate	2000
record_format	eric
spellingShingle	Metadata for Web Resources: How Metadata Works on the Web. Dillon, Martin Access to Information Cataloging Knowledge Representation Library Role Metadata Standards World Wide Web Metadata for Web Resources: How Metadata Works on the Web. Dillon, Martin Access to Information Cataloging Knowledge Representation Library Role Metadata Standards World Wide Web This paper discusses bibliographic control of knowledge resources on the World Wide Web. The first section sets the context of the inquiry. The second section covers the following topics related to metadata: (1) definitions of metadata, including metadata as tags and as descriptors; (2) metadata on the Web, including general metadata systems, resource description, PICS (Platform for Internet Content Selection) and other content controllers, the BizTalk and SOAP (Simple Object Access Protocol) frameworks, and rights management; and (3) the resource description framework, including the future of XML (eXtensible Markup Language). The third section addresses issues related to the Dublin Core metadata standard, including degree of completeness, institutional support, implementation, extensibility rules, and difficulties with the creator and relation elements. This section also considers difficulties with the object-attribute model. The fourth section discusses the role of libraries in Web resource description, including reasons why searching alone will not replace the need for human cataloging in the near future. The fifth section presents recommendations related to the following three options for libraries to provide access to knowledge resources on the Web: use or adapt MARC/AACR2; create a library metadata system with the same aims as the Dublin Core; or use or adapt the Dublin Core. Several relevant Web sites are listed. (MES)
title	Metadata for Web Resources: How Metadata Works on the Web.
topic	Access to Information Cataloging Knowledge Representation Library Role Metadata Standards World Wide Web
url	https://eric.ed.gov/?id=ED454856

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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