Create DiscriminatorValue

Signed-off-by: Otavio Santana <otaviopolianasantana@gmail.com>

api/mapping/mapping-core/src/main/java/jakarta/nosql/mapping/DiscriminatorValue.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2022 Otavio Santana and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the Eclipse
+ * Public License v. 2.0 are satisfied: GNU General Public License, version 2
+ * with the GNU Classpath Exception which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ */
+package jakarta.nosql.mapping;
+
+
+import javax.enterprise.inject.Stereotype;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ *  Specifies the value of the discriminator column for entities of the given type.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+@Stereotype
+public @interface DiscriminatorValue {
+    /**
+     * (Optional) The name of column to be used for the discriminator.
+     */
+    String value() default "type";
+}