Geographic Information Systems: How a World Wide Web Presence Can Improve Their Availability.

Fuente: ERIC Institute of Education Sciences

Saved in:

Bibliographic Details
Main Authors:	van Brakel, Pieter A., Pienaar, Martie
Format:	Recurso educativo Open Access
Language:	en
Published:	1997
Subjects:	Access to Information Databases Geography Information Dissemination Information Services World Wide Web
Online Access:	Acceder al recurso
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_version_	1867181579873288194
author	van Brakel, Pieter A. Pienaar, Martie
author_facet	van Brakel, Pieter A. Pienaar, Martie van Brakel, Pieter A. Pienaar, Martie
collection	Education Resources Information Center
contents	Geographic Information Systems: How a World Wide Web Presence Can Improve Their Availability. van Brakel, Pieter A. Pienaar, Martie Access to Information Databases Geography Information Dissemination Information Services World Wide Web Automated geographic information systems (GIS) consist of integrated digital databases containing information about geographic features; hardware, software, and people used in the analysis of features; and descriptions of features. Currently no standard method of accessing widely scattered geographic data exists. Argues that this can solved by making GIS data and information available via the World Wide Web. (PEN)
format	Recurso educativo Open Access
id	eric_EJ544753
institution	ERIC Institute of Education Sciences
language	en
publishDate	1997
record_format	eric
spellingShingle	Geographic Information Systems: How a World Wide Web Presence Can Improve Their Availability. van Brakel, Pieter A. Pienaar, Martie Access to Information Databases Geography Information Dissemination Information Services World Wide Web Geographic Information Systems: How a World Wide Web Presence Can Improve Their Availability. van Brakel, Pieter A. Pienaar, Martie Access to Information Databases Geography Information Dissemination Information Services World Wide Web Automated geographic information systems (GIS) consist of integrated digital databases containing information about geographic features; hardware, software, and people used in the analysis of features; and descriptions of features. Currently no standard method of accessing widely scattered geographic data exists. Argues that this can solved by making GIS data and information available via the World Wide Web. (PEN)
title	Geographic Information Systems: How a World Wide Web Presence Can Improve Their Availability.
topic	Access to Information Databases Geography Information Dissemination Information Services World Wide Web
url	https://eric.ed.gov/?id=EJ544753

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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REDIRECT_STATUS	"200"
VUFIND_LOCAL_DIR	"/usr/local/vufind/local"
HTTPS	"on"
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HTTP_USER_AGENT	"Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
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Environment Variables empty

Registered Handlers

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