diff --git a/module/finc/src/finc/Resolver/Driver/EzbTrait.php b/module/finc/src/finc/Resolver/Driver/EzbTrait.php
new file mode 100644
index 0000000000000000000000000000000000000000..8c74a4a2cec9c6b15d097556dfc093fe843a7515
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+++ b/module/finc/src/finc/Resolver/Driver/EzbTrait.php
@@ -0,0 +1,254 @@
+<?php
+/**
+ * EZB Link Resolver Driver Trait
+ *
+ * EZB is a free service -- the API endpoint is available at
+ * http://services.dnb.de/fize-service/gvr/full.xml
+ *
+ * API documentation is available at
+ * http://www.zeitschriftendatenbank.de/services/journals-online-print
+ *
+ * PHP version 7
+ *
+ * Copyright (C) Markus Fischer, info@flyingfischer.ch
+ *
+ * last update: 2011-04-13
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * @category VuFind
+ * @package Resolver_Drivers
+ * @author Markus Fischer <info@flyingfischer.ch>
+ * @author André Lahmann <lahmann@ub.uni-leipzig.de>
+ * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link https://vufind.org/wiki/development:plugins:link_resolver_drivers Wiki
+ */
+namespace finc\Resolver\Driver;
+
+use DOMDocument;
+use DOMXpath;
+
+/**
+ * EZB Link Resolver Driver
+ *
+ * @category VuFind
+ * @package Resolver_Drivers
+ * @author Markus Fischer <info@flyingfischer.ch>
+ * @author André Lahmann <lahmann@ub.uni-leipzig.de>
+ * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link https://vufind.org/wiki/development:plugins:link_resolver_drivers Wiki
+ */
+trait EzbTrait
+{
+ /**
+ * As the JOP resolver provides also generic labels 'Article', 'Journal'
+ * etc. in element AccessLevel this label can be used as title for
+ * resolver results by setting this variable to 'AccessLevel'
+ *
+ * @var string
+ */
+ protected static $xpathTitleSelector = 'Title';
+
+ /**
+ * Parse Links
+ *
+ * Parses an XML file returned by a link resolver
+ * and converts it to a standardised format for display
+ *
+ * @param string $xmlstr Raw XML returned by resolver
+ *
+ * @return array Array of values
+ */
+ public function parseLinks($xmlstr)
+ {
+ $records = []; // array to return
+
+ $xml = new DOMDocument();
+ if (!@$xml->loadXML($xmlstr)) {
+ return $records;
+ }
+
+ $xpath = new DOMXpath($xml);
+
+ // get results for online
+ $this->getElectronicResults('0', 'Free', $records, $xpath);
+ $this->getElectronicResults('1', 'Partially free', $records, $xpath);
+ $this->getElectronicResults('2', 'Licensed', $records, $xpath);
+ $this->getElectronicResults('3', 'Partially licensed', $records, $xpath);
+ $this->getElectronicResults('4', 'Not free', $records, $xpath);
+ $this->getElectronicResults('10', 'Unknown Electronic', $records, $xpath);
+
+ // get results for print, only if available
+ $this->getPrintResults('2', 'Print available', $records, $xpath);
+ $this->getPrintResults('3', 'Print partially available', $records, $xpath);
+ $this->getPrintResults('10', 'Unknown Print', $records, $xpath);
+
+ return $records;
+ }
+
+ /**
+ * Downgrade an OpenURL from v1.0 to v0.1 for compatibility with EZB.
+ *
+ * @param array $parsed Array of parameters parsed from the OpenURL.
+ *
+ * @return string EZB-compatible v0.1 OpenURL
+ */
+ protected function downgradeOpenUrl($parsed)
+ {
+ $downgraded = [];
+
+ // prepare content for downgrading
+ // resolver only accepts date formats YYYY, YYYY-MM, and YYYY-MM-DD
+ // in case we have a date in another format, drop the date information
+ if (isset($parsed['rft.date'])
+ && !preg_match('/^\d{4}(-\d\d(-\d\d)?)?$/', $parsed['rft.date'])
+ ) {
+ unset($parsed['rft.date']);
+ }
+
+ $map = [
+ 'rfr_id' => 'sid',
+ 'rft.date' => 'date',
+ 'rft.issn' => 'issn',
+ 'rft.isbn' => 'isbn', // isbn is supported as of 12/2021
+ 'rft.volume' => 'volume',
+ 'rft.issue' => 'issue',
+ 'rft.spage' => 'spage',
+ 'rft.pages' => 'pages',
+ ];
+
+ // ignore all other parameters
+ foreach ($parsed as $key => $value) {
+ // exclude empty parameters
+ if (isset($value) && $value !== '') {
+ if (isset($map[$key])) {
+ $downgraded[] = "{$map[$key]}=$value";
+ } elseif (in_array($key, $map)) {
+ $downgraded[] = "$key=$value";
+ }
+ }
+ }
+ if (!empty($downgraded)) {
+ // we need 'genre' but only the values
+ // article or journal are allowed...
+ return "genre=article&" . implode('&', $downgraded);
+ }
+
+ return implode('&', $parsed);
+ }
+
+ /**
+ * Extract electronic results from the EZB response and inject them into the
+ * $records array.
+ *
+ * @param string $state The state attribute value to extract
+ * @param string $coverage The coverage string to associate with the state
+ * @param array $records The array of results to update
+ * @param DOMXpath $xpath The XPath object containing parsed XML
+ *
+ * @return void
+ */
+ protected function getElectronicResults($state, $coverage, &$records, $xpath)
+ {
+ $results = $xpath->query(
+ "/OpenURLResponseXML/Full/ElectronicData/ResultList/Result[@state=" .
+ $state . "]"
+ );
+
+ /*
+ * possible state values:
+ * -1 ISSN nicht eindeutig
+ * 0 Standort-unabhängig frei zugänglich
+ * 1 Standort-unabhängig teilweise zugänglich (Unschärfe bedingt durch
+ * unspezifische Anfrage oder Moving-Wall)
+ * 2 Lizenziert
+ * 3 Für gegebene Bibliothek teilweise lizenziert (Unschärfe bedingt durch
+ * unspezifische Anfrage oder Moving-Wall)
+ * 4 nicht lizenziert
+ * 5 Zeitschrift gefunden
+ * Angaben über Erscheinungsjahr, Datum ... liegen außerhalb des
+ * hinterlegten bibliothekarischen Zeitraums
+ * 10 Unbekannt (ISSN unbekannt, Bibliothek unbekannt)
+ */
+ $state_access_mapping = [
+ '-1' => 'error',
+ '0' => 'open',
+ '1' => 'open',
+ '2' => 'limited',
+ '3' => 'limited',
+ '4' => 'denied',
+ '5' => 'denied',
+ '10' => 'unknown'
+ ];
+
+ $i = 0;
+ foreach ($results as $result) {
+ $record = [];
+
+ // get title from XPath Element defined in $xpathTitleSelector
+ $titleXP = "/OpenURLResponseXML/Full/ElectronicData/ResultList/" .
+ "Result[@state={$state}][" . ($i + 1) . "]/" .
+ static::$xpathTitleSelector;
+ $title = $xpath->query($titleXP, $result)->item(0);
+ if (isset($title)) {
+ $record['title'] = strip_tags($title->nodeValue);
+ }
+
+ // get additional coverage information
+ $additionalXP = "/OpenURLResponseXML/Full/ElectronicData/ResultList/" .
+ "Result[@state={$state}][" . ($i + 1) . "]/Additionals/Additional";
+ $additionalType = ['nali', 'intervall', 'moving_wall'];
+ $additionals = [];
+ foreach ($additionalType as $type) {
+ $additional = $xpath
+ ->query($additionalXP . "[@type='" . $type . "']", $result)
+ ->item(0);
+ if (isset($additional->nodeValue)) {
+ $additionals[$type] = strip_tags($additional->nodeValue);
+ }
+ }
+ $record['coverage']
+ = !empty($additionals) ? implode("; ", $additionals) : $coverage;
+
+ $record['access'] = $state_access_mapping[$state];
+
+ // try to find direct access URL
+ $accessUrlXP = "/OpenURLResponseXML/Full/ElectronicData/ResultList/" .
+ "Result[@state={$state}][" . ($i + 1) . "]/AccessURL";
+ $accessUrl = $xpath->query($accessUrlXP, $result)->item(0);
+
+ // try to find journal URL as fallback for direct access URL
+ $journalUrlXP = "/OpenURLResponseXML/Full/ElectronicData/ResultList/" .
+ "Result[@state={$state}][" . ($i + 1) . "]/JournalURL";
+ $journalUrl = $xpath->query($journalUrlXP, $result)->item(0);
+
+ // return direct access URL if available otherwise journal URL fallback
+ if (isset($accessUrl->nodeValue)) {
+ $record['href'] = $accessUrl->nodeValue;
+ } elseif (isset($journalUrl)) {
+ $record['href'] = $journalUrl->nodeValue;
+ }
+ // Service type needs to be hard-coded for calling code to properly
+ // categorize links. The commented code below picks a more appropriate
+ // value but won't work for now -- retained for future reference.
+ //$service_typeXP = "/OpenURLResponseXML/Full/ElectronicData/ResultList/"
+ // . "Result[@state={$state}][".($i+1)."]/AccessLevel";
+ //$record['service_type']
+ // = $xpath->query($service_typeXP, $result)->item(0)->nodeValue;
+ $record['service_type'] = 'getFullTxt';
+ array_push($records, $record);
+ $i++;
+ }
+ }
+}