diff --git a/apps/workflowengine/lib/Manager.php b/apps/workflowengine/lib/Manager.php
index d19aa31547a0f9e0026aedccf220929635d00a1b..0a1b7fab6c51b5b4d24665ba5ed8465ebb9c7821 100644
--- a/apps/workflowengine/lib/Manager.php
+++ b/apps/workflowengine/lib/Manager.php
@@ -40,7 +40,6 @@ use OCP\WorkflowEngine\IEntity;
 use OCP\WorkflowEngine\IEntityAware;
 use OCP\WorkflowEngine\IManager;
 use OCP\WorkflowEngine\IOperation;
-use OCP\WorkflowEngine\IOperator;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\GenericEvent;
 
@@ -76,7 +75,7 @@ class Manager implements IManager, IEntityAware {
 	/** @var IEntity[] */
 	protected $registeredEntities = [];
 
-	/** @var IOperator[] */
+	/** @var IOperation[] */
 	protected $registeredOperators = [];
 
 	/** @var ILogger */
@@ -550,16 +549,16 @@ class Manager implements IManager, IEntityAware {
 	 * @return IEntity[]
 	 */
 	public function getEntitiesList(): array {
-		$this->eventDispatcher->dispatch('OCP\WorkflowEngine::registerEntities', new GenericEvent($this));
+		$this->eventDispatcher->dispatch(IManager::EVENT_NAME_REG_ENTITY, new GenericEvent($this));
 
 		return array_merge($this->getBuildInEntities(), $this->registeredEntities);
 	}
 
 	/**
-	 * @return IOperator[]
+	 * @return IOperation[]
 	 */
 	public function getOperatorList(): array {
-		$this->eventDispatcher->dispatch('OCP\WorkflowEngine::registerOperators', new GenericEvent($this));
+		$this->eventDispatcher->dispatch(IManager::EVENT_NAME_REG_OPERATION, new GenericEvent($this));
 
 		return array_merge($this->getBuildInOperators(), $this->registeredOperators);
 	}
@@ -574,8 +573,8 @@ class Manager implements IManager, IEntityAware {
 		$this->registeredEntities[$entity->getId()] = $entity;
 	}
 
-	public function registerOperator(IOperator $operator): void {
-		$this->registeredOperators[$operator->getId()] = $operator;
+	public function registerOperation(IOperation $operator): void {
+		$this->registeredOperators[get_class($operator)] = $operator;
 	}
 
 	/**
@@ -593,7 +592,7 @@ class Manager implements IManager, IEntityAware {
 	}
 
 	/**
-	 * @return IOperator[]
+	 * @return IOperation[]
 	 */
 	protected function getBuildInOperators(): array {
 		try {
diff --git a/apps/workflowengine/lib/Settings/ASettings.php b/apps/workflowengine/lib/Settings/ASettings.php
index 78a23d924c70e3c46e53789dff8308310ffa2ef2..af3208fce270be7325489f1ca0013116d66ad77b 100644
--- a/apps/workflowengine/lib/Settings/ASettings.php
+++ b/apps/workflowengine/lib/Settings/ASettings.php
@@ -30,11 +30,11 @@ use OCP\AppFramework\Http\TemplateResponse;
 use OCP\IInitialStateService;
 use OCP\IL10N;
 use OCP\Settings\ISettings;
-use OCP\WorkflowEngine\IComplexOperator;
+use OCP\WorkflowEngine\IComplexOperation;
 use OCP\WorkflowEngine\IEntity;
 use OCP\WorkflowEngine\IEntityEvent;
-use OCP\WorkflowEngine\IOperator;
-use OCP\WorkflowEngine\ISpecificOperator;
+use OCP\WorkflowEngine\IOperation;
+use OCP\WorkflowEngine\ISpecificOperation;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 abstract class ASettings implements ISettings {
@@ -140,18 +140,18 @@ abstract class ASettings implements ISettings {
 	}
 
 	private function operatorsToArray(array $operators) {
-		$operators = array_filter($operators, function(IOperator $operator) {
+		$operators = array_filter($operators, function(IOperation $operator) {
 			return $operator->isAvailableForScope($this->getScope());
 		});
 
-		return array_map(function (IOperator $operator) {
+		return array_map(function (IOperation $operator) {
 			return [
-				'id' => $operator->getId(),
+				'id' => get_class($operator),
 				'icon' => $operator->getIcon(),
 				'name' => $operator->getDisplayName(),
 				'description' => $operator->getDescription(),
-				'fixedEntity' => $operator instanceof ISpecificOperator ? $operator->getEntityId() : '',
-				'isComplex' => $operator instanceof IComplexOperator,
+				'fixedEntity' => $operator instanceof ISpecificOperation ? $operator->getEntityId() : '',
+				'isComplex' => $operator instanceof IComplexOperation,
 			];
 		}, $operators);
 	}
diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 76322993b48774103a370d33627046f46229f419..f8fb8b76d6b126b4fd4a17f7a8eb93b38c767f35 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -439,14 +439,13 @@ return array(
     'OCP\\User\\Backend\\ISetPasswordBackend' => $baseDir . '/lib/public/User/Backend/ISetPasswordBackend.php',
     'OCP\\Util' => $baseDir . '/lib/public/Util.php',
     'OCP\\WorkflowEngine\\ICheck' => $baseDir . '/lib/public/WorkflowEngine/ICheck.php',
-    'OCP\\WorkflowEngine\\IComplexOperator' => $baseDir . '/lib/public/WorkflowEngine/IComplexOperator.php',
+    'OCP\\WorkflowEngine\\IComplexOperation' => $baseDir . '/lib/public/WorkflowEngine/IComplexOperation.php',
     'OCP\\WorkflowEngine\\IEntity' => $baseDir . '/lib/public/WorkflowEngine/IEntity.php',
     'OCP\\WorkflowEngine\\IEntityAware' => $baseDir . '/lib/public/WorkflowEngine/IEntityAware.php',
     'OCP\\WorkflowEngine\\IEntityEvent' => $baseDir . '/lib/public/WorkflowEngine/IEntityEvent.php',
     'OCP\\WorkflowEngine\\IManager' => $baseDir . '/lib/public/WorkflowEngine/IManager.php',
     'OCP\\WorkflowEngine\\IOperation' => $baseDir . '/lib/public/WorkflowEngine/IOperation.php',
-    'OCP\\WorkflowEngine\\IOperator' => $baseDir . '/lib/public/WorkflowEngine/IOperator.php',
-    'OCP\\WorkflowEngine\\ISpecificOperator' => $baseDir . '/lib/public/WorkflowEngine/ISpecificOperator.php',
+    'OCP\\WorkflowEngine\\ISpecificOperation' => $baseDir . '/lib/public/WorkflowEngine/ISpecificOperation.php',
     'OC\\Accounts\\Account' => $baseDir . '/lib/private/Accounts/Account.php',
     'OC\\Accounts\\AccountManager' => $baseDir . '/lib/private/Accounts/AccountManager.php',
     'OC\\Accounts\\AccountProperty' => $baseDir . '/lib/private/Accounts/AccountProperty.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index f164d0b15bd767fc8535e331d3752ad46f8efbec..ab47f44ff8e3f1456dc62c579f99c7d3d0937fd3 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -473,14 +473,13 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OCP\\User\\Backend\\ISetPasswordBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ISetPasswordBackend.php',
         'OCP\\Util' => __DIR__ . '/../../..' . '/lib/public/Util.php',
         'OCP\\WorkflowEngine\\ICheck' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/ICheck.php',
-        'OCP\\WorkflowEngine\\IComplexOperator' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IComplexOperator.php',
+        'OCP\\WorkflowEngine\\IComplexOperation' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IComplexOperation.php',
         'OCP\\WorkflowEngine\\IEntity' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IEntity.php',
         'OCP\\WorkflowEngine\\IEntityAware' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IEntityAware.php',
         'OCP\\WorkflowEngine\\IEntityEvent' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IEntityEvent.php',
         'OCP\\WorkflowEngine\\IManager' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IManager.php',
         'OCP\\WorkflowEngine\\IOperation' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IOperation.php',
-        'OCP\\WorkflowEngine\\IOperator' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IOperator.php',
-        'OCP\\WorkflowEngine\\ISpecificOperator' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/ISpecificOperator.php',
+        'OCP\\WorkflowEngine\\ISpecificOperation' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/ISpecificOperation.php',
         'OC\\Accounts\\Account' => __DIR__ . '/../../..' . '/lib/private/Accounts/Account.php',
         'OC\\Accounts\\AccountManager' => __DIR__ . '/../../..' . '/lib/private/Accounts/AccountManager.php',
         'OC\\Accounts\\AccountProperty' => __DIR__ . '/../../..' . '/lib/private/Accounts/AccountProperty.php',
diff --git a/lib/public/WorkflowEngine/IComplexOperator.php b/lib/public/WorkflowEngine/IComplexOperation.php
similarity index 94%
rename from lib/public/WorkflowEngine/IComplexOperator.php
rename to lib/public/WorkflowEngine/IComplexOperation.php
index ee2d3d0a1837d1e2326e1b4d1e5e836b38d05a3b..f3ba6d014a463497d0b1f97cc8d3678506b9693c 100644
--- a/lib/public/WorkflowEngine/IComplexOperator.php
+++ b/lib/public/WorkflowEngine/IComplexOperation.php
@@ -25,7 +25,7 @@ declare(strict_types=1);
 namespace OCP\WorkflowEngine;
 
 /**
- * Interface IComplexOperator
+ * Interface IComplexOperation
  *
  * This interface represents an operator that is less generic and indicates
  * that some of the tasks it does itself instead of relying on the engine.
@@ -40,4 +40,4 @@ namespace OCP\WorkflowEngine;
  *
  * @sincee 18.0.0
  */
-interface IComplexOperator extends IOperator { }
+interface IComplexOperation extends IOperation { }
diff --git a/lib/public/WorkflowEngine/IManager.php b/lib/public/WorkflowEngine/IManager.php
index 6d4bacc8e17640098c8219f1d583aadd95c10b4c..8ef7a3a03e88637b18ab69bc7a3d0682a2e25c17 100644
--- a/lib/public/WorkflowEngine/IManager.php
+++ b/lib/public/WorkflowEngine/IManager.php
@@ -37,6 +37,9 @@ interface IManager {
 	const SCOPE_ADMIN = 0;
 	const SCOPE_USER = 1;
 
+	const EVENT_NAME_REG_OPERATION = 'OCP\WorkflowEngine::registerOperations';
+	const EVENT_NAME_REG_ENTITY = 'OCP\WorkflowEngine::registerEntities';
+
 	/**
 	 * @param IStorage $storage
 	 * @param string $path
@@ -66,5 +69,5 @@ interface IManager {
 	 *
 	 * @since 18.0.0
 	 */
-	public function registerOperator(IOperator $operator): void;
+	public function registerOperation(IOperation $operator): void;
 }
diff --git a/lib/public/WorkflowEngine/IOperation.php b/lib/public/WorkflowEngine/IOperation.php
index 491a805909cd9e19f684e1aa7767557cd7ee3d74..0862588e86f35a7db0fda4f96ac8185e67422990 100644
--- a/lib/public/WorkflowEngine/IOperation.php
+++ b/lib/public/WorkflowEngine/IOperation.php
@@ -31,11 +31,57 @@ namespace OCP\WorkflowEngine;
  */
 interface IOperation {
 	/**
-	 * @param string $name
-	 * @param array[] $checks
-	 * @param string $operation
+	 * returns a translated name to be presented in the web interface
+	 *
+	 * Example: "Automated tagging" (en), "AÅ­tomata etikedado" (eo)
+	 *
+	 * @since 18.0.0
+	 */
+	public function getDisplayName(): string;
+
+	/**
+	 * returns a translated, descriptive text to be presented in the web interface.
+	 *
+	 * It should be short and precise.
+	 *
+	 * Example: "Tag based automatic deletion of files after a given time." (en)
+	 *
+	 * @since 18.0.0
+	 */
+	public function getDescription(): string;
+
+	/**
+	 * returns the URL to the icon of the operator for display in the web interface.
+	 *
+	 * Usually, the implementation would utilize the `imagePath()` method of the
+	 * `\OCP\IURLGenerator` instance and simply return its result.
+	 *
+	 * Example implementation: return $this->urlGenerator->imagePath('myApp', 'cat.svg');
+	 *
+	 * @since 18.0.0
+	 */
+	public function getIcon(): string;
+
+	/**
+	 * returns whether the operation can be used in the requested scope.
+	 *
+	 * Scope IDs are defined as constants in OCP\WorkflowEngine\IManager. At
+	 * time of writing these are SCOPE_ADMIN and SCOPE_USER.
+	 *
+	 * For possibly unknown future scopes the recommended behaviour is: if
+	 * user scope is permitted, the default behaviour should return `true`,
+	 * otherwise `false`.
+	 *
+	 * @since 18.0.0
+	 */
+	public function isAvailableForScope(int $scope): bool;
+
+	/**
+	 * Validates whether a configured workflow rule is valid. If it is not,
+	 * an `\UnexpectedValueException` is supposed to be thrown.
+	 *
 	 * @throws \UnexpectedValueException
 	 * @since 9.1
 	 */
-	public function validateOperation($name, array $checks, $operation);
+	public function validateOperation(string $name, array $checks, string $operation): void;
 }
diff --git a/lib/public/WorkflowEngine/IOperator.php b/lib/public/WorkflowEngine/IOperator.php
deleted file mode 100644
index 70c80d98c45b1f1ebc864d10b122d8952e5903ae..0000000000000000000000000000000000000000
--- a/lib/public/WorkflowEngine/IOperator.php
+++ /dev/null
@@ -1,91 +0,0 @@
-<?php
-declare(strict_types=1);
-/**
- * @copyright Copyright (c) 2019 Arthur Schiwon <blizzz@arthur-schiwon.de>
- *
- * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
- *
- * @license GNU AGPL version 3 or any later version
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * 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 Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-namespace OCP\WorkflowEngine;
-
-/**
- * @since 18.0.0
- */
-interface IOperator {
-	/**
-	 * returns the unique identity of the operator
-	 *
-	 * It is recommended to use the namespaced class name of the IOperator
-	 * implementation. Especially workflow applications released before
-	 * Nextcloud 18 should chose this as id for compatibility.
-	 *
-	 * Example: OCA\FilesAutomatedTagging\Operation
-	 *
-	 * @since 18.0.0
-	 */
-	public function getId(): string;
-
-	/**
-	 * returns a translated name to be presented in the web interface
-	 *
-	 * Example: "Automated tagging" (en), "AÅ­tomata etikedado" (eo)
-	 *
-	 * @since 18.0.0
-	 */
-	public function getDisplayName(): string;
-
-	/**
-	 * returns a translated, descriptive text to be presented in the web interface.
-	 *
-	 * It should be short and precise.
-	 *
-	 * Example: "Tag based automatic deletion of files after a given time." (en)
-	 *
-	 * @since 18.0.0
-	 */
-	public function getDescription(): string;
-
-	/**
-	 * returns the URL to the icon of the operator for display in the web interface.
-	 *
-	 * Usually, the implementation would utilize the `imagePath()` method of the
-	 * `\OCP\IURLGenerator` instance and simply return its result.
-	 *
-	 * Example implementation: return $this->urlGenerator->imagePath('myApp', 'cat.svg');
-	 *
-	 * @since 18.0.0
-	 */
-	public function getIcon(): string;
-
-	/**
-	 * returns whether the operation can be used in the requested scope.
-	 *
-	 * Scope IDs are defined as constants in OCP\WorkflowEngine\IManager. At
-	 * time of writing these are SCOPE_ADMIN and SCOPE_USER.
-	 *
-	 * For possibly unknown future scopes the recommended behaviour is: if
-	 * user scope is permitted, the default behaviour should return `true`,
-	 * otherwise `false`.
-	 *
-	 * @since 18.0.0
-	 */
-	public function isAvailableForScope(int $scope): bool;
-
-
-}
diff --git a/lib/public/WorkflowEngine/ISpecificOperator.php b/lib/public/WorkflowEngine/ISpecificOperation.php
similarity index 94%
rename from lib/public/WorkflowEngine/ISpecificOperator.php
rename to lib/public/WorkflowEngine/ISpecificOperation.php
index a5ae9fc1841f9bf5f6bf8870235defc875bc3137..0b26770a13ac86b9ebf00e4cf4e9d5aa1eadb9dc 100644
--- a/lib/public/WorkflowEngine/ISpecificOperator.php
+++ b/lib/public/WorkflowEngine/ISpecificOperation.php
@@ -25,7 +25,7 @@ declare(strict_types=1);
 namespace OCP\WorkflowEngine;
 
 /**
- * Interface ISpecificOperator
+ * Interface ISpecificOperation
  *
  * This interface represents an operator that is designed to work with exactly
  * one entity type.
@@ -37,7 +37,7 @@ namespace OCP\WorkflowEngine;
  * @package OCP\WorkflowEngine
  * @since 18.0.0
  */
-interface ISpecificOperator extends IOperator {
+interface ISpecificOperation extends IOperation {
 
 	/**
 	 * returns the id of the entity the operator is designed for