Add qualified Dublin Core record driver.

composer.json

@@ -96,6 +96,7 @@
         "matthiasmullie/minify": "1.3.75",
         "monolog/monolog": "^3.9",
         "mpdf/mpdf": "v8.2.6",
+        "natlibfi/finna-xml": "1.6.0",
         "paytrail/paytrail-php-sdk": "2.7.5",
         "pear/archive_tar": "^1.4",
         "phing/phing": "3.1.0",

module/VuFind/src/VuFind/RecordDriver/Feature/LocaleSupportTrait.php

@@ -0,0 +1,97 @@
+<?php
+
+/**
+ * Functions for locale-specific processing in record drivers.
+ *
+ * PHP version 8
+ *
+ * Copyright (C) The National Library of Finland 2026.
+ *
+ * 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, see
+ * <https://www.gnu.org/licenses/>.
+ *
+ * @category VuFind
+ * @package  RecordDrivers
+ * @author   Ere Maijala <ere.maijala@helsinki.fi>
+ * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link     https://vufind.org/wiki/development:plugins:record_drivers Wiki
+ */
+
+namespace VuFind\RecordDriver\Feature;
+
+/**
+ * Functions for locale-specific processing in record drivers.
+ *
+ * @category VuFind
+ * @package  RecordDrivers
+ * @author   Ere Maijala <ere.maijala@helsinki.fi>
+ * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link     https://vufind.org/wiki/development:plugins:record_drivers Wiki
+ */
+trait LocaleSupportTrait
+{
+    /**
+     * Pick correct results from locale-specific results with fallback to all results.
+     *
+     * @param array        $localeResults Result(s) keyed by locale
+     * @param array|string $allResults    All results
+     *
+     * @return array|string
+     */
+    protected function getLocaleSpecificResults(array $localeResults, array|string $allResults): array|string
+    {
+        if (null === $this->localeSettings) {
+            return $allResults;
+        }
+        $userLocale = $this->localeSettings->getUserLocale();
+        if (null !== ($results = $this->getBestLocaleMatch($userLocale, $localeResults))) {
+            return $results;
+        }
+        // Check for match in default and fallback locales:
+        $locales = [$this->localeSettings->getDefaultLocale(), ...$this->localeSettings->getFallbackLocales()];
+        foreach ($locales as $locale) {
+            if (null !== ($results = $this->getBestLocaleMatch($locale, $localeResults))) {
+                return $results;
+            }
+        }
+        // Could not find anything else, so return all:
+        return $allResults;
+    }
+
+    /**
+     * Pick best match for a locale from the results.
+     *
+     * @param string $locale        Locale
+     * @param array  $localeResults Result(s) keyed by locale
+     *
+     * @return mixed
+     */
+    protected function getBestLocaleMatch(string $locale, array $localeResults): mixed
+    {
+        [$language] = explode('-', $locale);
+        if ($results = $localeResults[$locale] ?? $localeResults[$language] ?? null) {
+            return $results;
+        }
+
+        // Check for matching language in locale-specific results:
+        [$language] = explode('-', $locale);
+        foreach ($localeResults as $resultLocale => $results) {
+            [$resultLanguage] = explode('-', $resultLocale);
+            if ($resultLanguage === $language) {
+                return $results;
+            }
+        }
+
+        return null;
+    }
+}

module/VuFind/src/VuFind/RecordDriver/Feature/XmlTrait.php

@@ -0,0 +1,97 @@
+<?php
+
+/**
+ * Functions for reading XML records.
+ *
+ * PHP version 8
+ *
+ * Copyright (C) The National Library of Finland 2026.
+ *
+ * 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, see
+ * <https://www.gnu.org/licenses/>.
+ *
+ * @category VuFind
+ * @package  RecordDrivers
+ * @author   Ere Maijala <ere.maijala@helsinki.fi>
+ * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link     https://vufind.org/wiki/development:plugins:record_drivers Wiki
+ */
+
+namespace VuFind\RecordDriver\Feature;
+
+use FinnaXml\XmlDoc;
+
+/**
+ * Functions for reading XML records.
+ *
+ * Assumption: raw XML data can be found in $this->fields['fullrecord'].
+ *
+ * @category VuFind
+ * @package  RecordDrivers
+ * @author   Ere Maijala <ere.maijala@helsinki.fi>
+ * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link     https://vufind.org/wiki/development:plugins:record_drivers Wiki
+ */
+trait XmlTrait
+{
+    /**
+     * The XML namespace.
+     *
+     * Note: this is a property instead of a constant to make use of it in strings cleaner.
+     *
+     * @var string
+     */
+    protected string $xmlNs = 'http://www.w3.org/2000/xmlns/';
+
+    /**
+     * XML class to use.
+     *
+     * @var string
+     */
+    protected string $xmlClass = \FinnaXml\XmlDoc::class;
+
+    /**
+     * XML instance. Access only via getXmlReader() as this is initialized lazily.
+     *
+     * @var XmlDoc
+     */
+    protected ?XmlDoc $lazyXmlReader = null;
+
+    /**
+     * Get access to the XML object.
+     *
+     * @return XmlDoc
+     */
+    public function getXmlReader(): XmlDoc
+    {
+        if (null === $this->lazyXmlReader) {
+            $this->lazyXmlReader = new $this->xmlClass();
+            $this->lazyXmlReader->parse($this->fields['fullrecord']);
+        }
+
+        return $this->lazyXmlReader;
+    }
+
+    /**
+     * Get lang attribute from xml namespace with fallback to default namespace.
+     *
+     * @param array $node XmlDoc node
+     *
+     * @return ?string
+     */
+    protected function getLangAttr(array $node): ?string
+    {
+        $xml = $this->getXmlReader();
+        return $xml->attr($node, '{{$this->xmlNs}}lang') ?? $xml->attr($node, 'lang');
+    }
+}

module/VuFind/src/VuFind/RecordDriver/PluginManager.php

@@ -69,6 +69,7 @@ class PluginManager extends \VuFind\ServiceManager\AbstractPluginManager
         'solrmarc' => SolrMarc::class,
         'solrmarcremote' => SolrMarcRemote::class,
         'solroverdrive' => SolrOverdrive::class,
+        'solrqdc' => SolrQdc::class,
         'solrreserves' => SolrReserves::class,
         'solrweb' => SolrWeb::class,
         'summon' => Summon::class,
@@ -109,6 +110,7 @@ class PluginManager extends \VuFind\ServiceManager\AbstractPluginManager
         SolrMarc::class => SolrDefaultFactory::class,
         SolrMarcRemote::class => SolrDefaultFactory::class,
         SolrOverdrive::class => SolrOverdriveFactory::class,
+        SolrQdc::class => SolrDefaultFactory::class,
         SolrReserves::class => SolrDefaultWithoutSearchServiceFactory::class,
         SolrWeb::class => SolrWebFactory::class,
         Summon::class => SummonFactory::class,