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diff --git a/lib/public/Config/Lexicon/ILexicon.php b/lib/public/Config/Lexicon/ILexicon.php
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+++ b/lib/public/Config/Lexicon/ILexicon.php
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+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace OCP\Config\Lexicon;
+
+use OCP\AppFramework\Attribute\Implementable;
+
+/**
+ * This interface needs to be implemented if you want to define a config lexicon for your application
+ * The config lexicon is used to avoid conflicts and problems when storing/retrieving config values
+ */
+#[Implementable(since: '32.0.0')]
+interface ILexicon {
+
+	/**
+	 * Define the expected behavior when using config
+	 * keys not set within your application config lexicon.
+	 *
+	 * @return Strictness
+	 * @since 32.0.0
+	 *@see Strictness
+	 */
+	public function getStrictness(): Strictness;
+
+	/**
+	 * define the list of entries of your application config lexicon, related to AppConfig.
+	 *
+	 * @return Entry[]
+	 * @since 32.0.0
+	 */
+	public function getAppConfigs(): array;
+
+	/**
+	 * define the list of entries of your application config lexicon, related to UserPreferences.
+	 *
+	 * @return Entry[]
+	 * @since 32.0.0
+	 */
+	public function getUserConfigs(): array;
+}