Previews and Overviews in Digital Libraries: Designing Surrogates to Support Visual Information Seeking.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Authors:	Greene, Stephan, Marchionini, Gary, Plaisant, Catherine, Shneiderman, Ben
Format:	Recurso educativo Open Access
Language:	en
Published:	2000
Subjects:	Computer Graphics Computer Interfaces Computer System Design Design Requirements Electronic Libraries Guidelines Information Seeking World Wide Web
Online Access:	Acceder al recurso
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_version_	1867181610795794432
author	Greene, Stephan Marchionini, Gary Plaisant, Catherine Shneiderman, Ben
author_facet	Greene, Stephan Marchionini, Gary Plaisant, Catherine Shneiderman, Ben Greene, Stephan Marchionini, Gary Plaisant, Catherine Shneiderman, Ben
collection	Education Resources Information Center
contents	Previews and Overviews in Digital Libraries: Designing Surrogates to Support Visual Information Seeking. Greene, Stephan Marchionini, Gary Plaisant, Catherine Shneiderman, Ben Computer Graphics Computer Interfaces Computer System Design Design Requirements Electronic Libraries Guidelines Information Seeking World Wide Web Presents a framework for the design of information representations in terms of previews and overviews, to aid designers of digital library interfaces. Defines previews and overviews, as graphic or textual representations of information abstracted from primary information objects, analogous to bibliographic records and catalogs; and describes four example applications. (Author/LRW)
format	Recurso educativo Open Access
id	eric_EJ605299
institution	ERIC Institute of Education Sciences
language	en
publishDate	2000
record_format	eric
spellingShingle	Previews and Overviews in Digital Libraries: Designing Surrogates to Support Visual Information Seeking. Greene, Stephan Marchionini, Gary Plaisant, Catherine Shneiderman, Ben Computer Graphics Computer Interfaces Computer System Design Design Requirements Electronic Libraries Guidelines Information Seeking World Wide Web Previews and Overviews in Digital Libraries: Designing Surrogates to Support Visual Information Seeking. Greene, Stephan Marchionini, Gary Plaisant, Catherine Shneiderman, Ben Computer Graphics Computer Interfaces Computer System Design Design Requirements Electronic Libraries Guidelines Information Seeking World Wide Web Presents a framework for the design of information representations in terms of previews and overviews, to aid designers of digital library interfaces. Defines previews and overviews, as graphic or textual representations of information abstracted from primary information objects, analogous to bibliographic records and catalogs; and describes four example applications. (Author/LRW)
title	Previews and Overviews in Digital Libraries: Designing Surrogates to Support Visual Information Seeking.
topic	Computer Graphics Computer Interfaces Computer System Design Design Requirements Electronic Libraries Guidelines Information Seeking World Wide Web
url	https://eric.ed.gov/?id=EJ605299

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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Environment & details:

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