Added relevant comments to AttributeDefDTO

com.osgifx.console.agent.api/src/main/java/com/osgifx/console/agent/dto/XAttributeDefDTO.java

@@ -2,31 +2,51 @@
  * Copyright 2021-2024 Amit Kumar Mondal
  *
  * 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
+ * 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
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  * License for the specific language governing permissions and limitations under
  * the License.
  ******************************************************************************/
+
 package com.osgifx.console.agent.dto;
 
 import java.util.List;
 
 import org.osgi.dto.DTO;
 
+/**
+ * A data transfer object (DTO) representing an attribute definition.
+ * 
+ * It encapsulates information about the attribute's ID, name, description,
+ * data type, cardinality, option values, and default value(s).
+ */
 public class XAttributeDefDTO extends DTO {
 
-    public String       id;
-    public String       name;
-    public String       description;
-    public int          type;
-    public int          cardinality;
+    /** The ID of the attribute definition */
+    public String id;
+
+    /** The name of the attribute definition */
+    public String name;
+
+    /** The description of the attribute definition */
+    public String description;
+
+    /** The data type of the attribute definition */
+    public int type;
+
+    /** The cardinality (number of values) allowed for the attribute */
+    public int cardinality;
+
+    /** The list of option values available for the attribute */
     public List<String> optionValues;
+
+    /** The default value(s) assigned to the attribute */
     public List<String> defaultValue;
 
 }