<?php

/**
 * Copyright 2022 SURFnet B.V.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Surfnet\ServiceProviderDashboard\Application\Service;

use Surfnet\ServiceProviderDashboard\Application\Service\ValueObject\EntityMergeAttribute;
use Surfnet\ServiceProviderDashboard\Application\ViewObject\Attribute;

interface AttributeServiceInterface
{
    /**
     * @return Attribute[]
     */
    public function getAttributeTypeAttributes(): array;

    /**
     * @return EntityMergeAttribute[]
     */
    public function getEntityMergeAttributes(): array;

    public function getUrns(): array;
}

<?php

/**
 * Copyright 2022 SURFnet B.V.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Surfnet\ServiceProviderDashboard\Application\Service;

use Surfnet\ServiceProviderDashboard\Application\ViewObject\Attribute;

interface AttributeServiceInterface
{
    /**
     * @return Attribute[]
     */
    public function getAttributeTypeAttributes(): array;
}

--- 
+++ 
@@ -18,6 +18,7 @@
 
 namespace Surfnet\ServiceProviderDashboard\Application\Service;
 
+use Surfnet\ServiceProviderDashboard\Application\Service\ValueObject\EntityMergeAttribute;
 use Surfnet\ServiceProviderDashboard\Application\ViewObject\Attribute;
 
 interface AttributeServiceInterface
@@ -26,4 +27,11 @@
      * @return Attribute[]
      */
     public function getAttributeTypeAttributes(): array;
+
+    /**
+     * @return EntityMergeAttribute[]
+     */
+    public function getEntityMergeAttributes(): array;
+
+    public function getUrns(): array;
 }
Add remaining AttributeService methods to the interface
