ds: Disambiguate reference parameter zero and unset
/*
- * Copyright (c) OSGi Alliance (2013, 2016). All Rights Reserved.
+ * Copyright (c) OSGi Alliance (2013, 2017). All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -151,12 +151,12 @@ public class ReferenceDTO extends DTO {
* reference.
* <p>
* This is declared in the {@code parameter} attribute of the
- * {@code reference} element. This must be zero if the component description
- * does not declare a parameter number for the reference.
+ * {@code reference} element. This must be {@code null} if the component
+ * description does not declare a parameter number for the reference.
*
* @since 1.4
*/
- public int parameter;
+ public Integer parameter;
/**
* The collection type for the reference.
