diff --git a/README.md b/README.md
index b684b07..cf3469f 100644
--- a/README.md
+++ b/README.md
@@ -12,12 +12,12 @@
     <dependency>
         <groupId>io.github.alaugks</groupId>
         <artifactId>spring-messagesource-base</artifactId>
-        <version>0.1.0.1-SNAPSHOT</version>
+        <version>1.0.0.rc1-SNAPSHOT</version>
     </dependency>
 </dependencies>
 ```
 
-## Configuration
+## MessageSource Configuration
 ```java
 import io.github.alaugks.spring.messagesource.base.catalog.Catalog;
 import io.github.alaugks.spring.messagesource.base.catalog.CatalogHandler;
@@ -36,13 +36,31 @@ public class MessageConfig {
     public MessageSource messageSource() {
         
         List<Translation> translations = new ArrayList<>();
-        translations.add(new Translation(Locale.forLanguageTag("en"), "hello_world", "Hello World"));
-        translations.add(new Translation(Locale.forLanguageTag("de"), "hello_world", "Hallo Welt"));
+
+        var localeEn = Locale.forLanguageTag("en");
+        translations.add(new Translation(localeEn, "headline", "Headline"));
+        translations.add(new Translation(localeEn, "postcode", "Postcode"));
+        translations.add(new Translation(localeEn, "email-notice", "Your email {0} has been registered."));
+        translations.add(new Translation(localeEn, "default-message", "This is a default message."));
+        translations.add(new Translation(localeEn, "headline", "Payment", "payment"));
+        translations.add(new Translation(localeEn, "expiry_date", "Expiry date", "payment"));
+
+        var localeEnUs = Locale.forLanguageTag("en-US");
+        translations.add(new Translation(localeEnUs, "postcode", "Zip code"));
+        translations.add(new Translation(localeEnUs, "expiry_date", "Expiration date", "payment"));
+
+        var localeDe = Locale.forLanguageTag("de");
+        translations.add(new Translation(localeDe, "headline", "Überschrift"));
+        translations.add(new Translation(localeDe, "postcode", "Postleitzahl"));
+        translations.add(new Translation(localeDe, "email-notice", "Ihre E-Mail {0} wurde registriert."));
+        translations.add(new Translation(localeDe, "default-message", "Das ist ein Standardtext."));
+        translations.add(new Translation(localeDe, "headline", "Zahlung", "payment"));
+        translations.add(new Translation(localeDe, "expiry_date", "Ablaufdatum", "payment"));
 
         return new BaseTranslationMessageSource(
             CatalogHandler
                 .builder(
-                   new Catalog(
+                    new Catalog(
                         translations,
                         Locale.forLanguageTag("en")
                     )
@@ -53,6 +71,167 @@ public class MessageConfig {
 }
 ```
 
+
+### Target values
+
+<table>
+  <thead>
+  <tr>
+    <th>id</th>
+    <th>en</th>
+    <th>en-US</th>
+    <th>de</th>
+    <th>jp***</th>
+  </tr>
+  </thead>
+  <tbody>
+  <tr>
+    <td>headline*<br>messages.headline</td>
+    <td>Headline</td>
+    <td>Headline**</td>
+    <td>Überschrift</td>
+    <td>Headline</td>
+  </tr>
+  <tr>
+    <td>postcode*<br>messages.postcode</td>
+    <td>Postcode</td>
+    <td>Zip code</td>
+    <td>Postleitzahl</td>
+    <td>Postcode</td>
+  </tr>
+  <tr>
+    <td>email-notice*<br>messages.email-notice</td>
+    <td>Your email {0} has been registered.</td>
+    <td>Your email {0} has been registered.**</td>
+    <td>Ihre E-Mail {0} wurde registriert.</td>
+    <td>Your email {0} has been registered.</td>
+  </tr>
+  <tr>
+    <td>default-message*<br>messages.default-message</td>
+    <td>This is a default message.</td>
+    <td>This is a default message.**</td>
+    <td>Das ist ein Standardtext.</td>
+    <td>This is a default message.</td>
+  </tr>
+  <tr>
+    <td>payment.headline</td>
+    <td>Payment</td>
+    <td>Payment**</td>
+    <td>Zahlung</td>
+    <td>Payment</td>
+  </tr>
+  <tr>
+    <td>payment.expiry_date</td>
+    <td>Expiry date</td>
+    <td>Expiration date</td>
+    <td>Ablaufdatum</td>
+    <td>Expiry date</td>
+  </tr>
+  </tbody>
+</table>
+
+> *Default domain is `messages`.
+>
+> **Example of a fallback from Language_Region (`en-US`) to Language (`en`). The `id` does not exist in `en-US`, so it tries to select the translation with locale `en`.
+> 
+> ***There is no translation for Japanese (`jp`). The default locale translations (`en`) are selected.
+
+<a name="a5"></a>
+
+## Using the MessageSource
+
+With the implementation and use of the MessageSource interface, the translations are also available in **Thymeleaf**, as **Service (Dependency Injection)** and **Custom Validation Messages**. Also in packages and implementations that use the MessageSource.
+
+### Thymeleaf
+
+With the configured MessageSource, the translations are available in Thymeleaf.
+
+```html
+<!-- Default domain: messages -->
+
+<!-- "Headline" -->
+<h1 th:text="#{headline}"/>
+<h1 th:text="#{messages.headline}"/>
+
+<!-- "Postcode" -->
+<label th:text="#{postcode}"/>
+<label th:text="#{messages.postcode}"/>
+
+<!-- "Your email john.doe@example.com has been registered." -->
+<span th:text="#{email-notice('john.doe@example.com')}"/>
+<span th:text="#{messages.email-notice('john.doe@example.com')}"/>
+
+<!-- "This is a default message." -->
+<span th:text="${#messages.msgOrNull('not-exists-id')} ?: #{default-message}"/>
+<span th:text="${#messages.msgOrNull('not-exists-id')} ?: #{messages.default-message}"/>
+
+
+<!-- Domain: payment -->
+
+<!-- "Payment" -->
+<h2 th:text="#{payment.headline}"/>
+
+<!-- "Expiry date" -->
+<strong th:text="#{payment.expiry_date}"/>
+```
+
+### Service (Dependency Injection)
+
+The MessageSource can be set via Autowire to access the translations.
+
+```java
+import org.springframework.context.MessageSource;
+
+private final MessageSource messageSource;
+
+// Autowire MessageSource
+public MyClass(MessageSource messageSource) {
+    this.messageSource = messageSource;
+}
+
+
+// Default domain: messages
+
+// "Headline"
+this.messageSource.getMessage("headline", null, locale);
+this.messageSource.getMessage("messages.headline", null, locale);
+
+// "Postcode"
+this.messageSource.getMessage("postcode", null, locale);
+this.messageSource.getMessage("messages.postcode", null, locale);
+
+// "Your email john.doe@example.com has been registered."
+Object[] args = {"john.doe@example.com"};
+this.messageSource.getMessage("email-notice", args, locale);
+this.messageSource.getMessage("messages.email-notice", args, locale);
+
+// "This is a default message."
+//String defaultMessage = this.messageSource.getMessage("default-message", null, locale);
+String defaultMessage = this.messageSource.getMessage("messages.default-message", null, locale);
+this.messageSource.getMessage("not-exists-id", null, defaultMessage, locale);
+
+
+// Domain: payment
+
+// "Payment"
+this.messageSource.getMessage("payment.headline", null, locale);
+
+// "Expiry date"
+this.messageSource.getMessage("payment.expiry-date", null, locale);
+```
+
+### Custom Validation Messages
+
+The article [Custom Validation MessageSource in Spring Boot](https://www.baeldung.com/spring-custom-validation-message-source) describes how to use custom validation messages.
+
+
+## Support
+
+If you have questions, comments or feature requests please use the [Discussions](https://github.com/alaugks/spring-xliff-translation/discussions) section.
+
+<a name="a8"></a>
+
+
 ## Translation Sources
 
 * [XLIFF 2.0.0-SNAPSHOT](https://github.com/alaugks/spring-messagesource-xliff/tree/snapshot/2.0.0)
diff --git a/src/test/java/io/github/alaugks/spring/messagesource/base/BaseTranslationMessageSourceExampleTest.java b/src/test/java/io/github/alaugks/spring/messagesource/base/BaseTranslationMessageSourceExampleTest.java
new file mode 100644
index 0000000..67d4557
--- /dev/null
+++ b/src/test/java/io/github/alaugks/spring/messagesource/base/BaseTranslationMessageSourceExampleTest.java
@@ -0,0 +1,120 @@
+package io.github.alaugks.spring.messagesource.base;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import io.github.alaugks.spring.messagesource.base.catalog.Catalog;
+import io.github.alaugks.spring.messagesource.base.catalog.CatalogHandler;
+import io.github.alaugks.spring.messagesource.base.records.Translation;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.springframework.context.MessageSource;
+
+class BaseTranslationMessageSourceExampleTest {
+
+    MessageSource messageSource;
+
+    public BaseTranslationMessageSourceExampleTest() {
+        this.messageSource = this.messageSource();
+    }
+
+    public MessageSource messageSource() {
+
+        List<Translation> translations = new ArrayList<>();
+
+        var localeEn = Locale.forLanguageTag("en");
+        translations.add(new Translation(localeEn, "headline", "Headline"));
+        translations.add(new Translation(localeEn, "postcode", "Postcode"));
+        translations.add(new Translation(localeEn, "email-notice", "Your email {0} has been registered."));
+        translations.add(new Translation(localeEn, "default-message", "This is a default message."));
+        translations.add(new Translation(localeEn, "headline", "Payment", "payment"));
+        translations.add(new Translation(localeEn, "expiry_date", "Expiry date", "payment"));
+
+        var localeEnUs = Locale.forLanguageTag("en-US");
+        translations.add(new Translation(localeEnUs, "postcode", "Zip code"));
+        translations.add(new Translation(localeEnUs, "expiry_date", "Expiration date", "payment"));
+
+        var localeDe = Locale.forLanguageTag("de");
+        translations.add(new Translation(localeDe, "headline", "Überschrift"));
+        translations.add(new Translation(localeDe, "postcode", "Postleitzahl"));
+        translations.add(new Translation(localeDe, "email-notice", "Ihre E-Mail {0} wurde registriert."));
+        translations.add(new Translation(localeDe, "default-message", "Das ist ein Standardtext."));
+        translations.add(new Translation(localeDe, "headline", "Zahlung", "payment"));
+        translations.add(new Translation(localeDe, "expiry_date", "Ablaufdatum", "payment"));
+
+        return new BaseTranslationMessageSource(
+            CatalogHandler
+                .builder(
+                    new Catalog(
+                        translations,
+                        Locale.forLanguageTag("en")
+                    )
+                )
+                .build()
+        );
+    }
+
+
+    @ParameterizedTest()
+    @MethodSource("dataProvider_examples")
+    void test_example(String code, String locale, Object expected, Object[] args) {
+        String message = this.messageSource.getMessage(
+            code,
+            args,
+            Locale.forLanguageTag(locale)
+        );
+        assertEquals(expected, message);
+    }
+
+    private static Stream<Arguments> dataProvider_examples() {
+        return Stream.of(
+            Arguments.of("headline", "en", "Headline", null),
+            Arguments.of("messages.headline", "en", "Headline", null),
+            Arguments.of("postcode", "en", "Postcode", null),
+            Arguments.of("messages.postcode", "en", "Postcode", null),
+            Arguments.of("email-notice", "en", "Your email foo@example.com has been registered.", new Object[] {"foo@example.com"}),
+            Arguments.of("messages.email-notice", "en", "Your email foo@example.com has been registered.", new Object[] {"foo@example.com"}),
+            Arguments.of("default-message", "en", "This is a default message.", null),
+            Arguments.of("messages.default-message", "en", "This is a default message.", null),
+            Arguments.of("payment.headline", "en", "Payment", null),
+            Arguments.of("payment.expiry_date", "en", "Expiry date", null),
+
+            Arguments.of("headline", "en-US", "Headline", null),
+            Arguments.of("messages.headline", "en-US", "Headline", null),
+            Arguments.of("postcode", "en-US", "Zip code", null),
+            Arguments.of("messages.postcode", "en-US", "Zip code", null),
+            Arguments.of("email-notice", "en-US", "Your email foo@example.com has been registered.", new Object[] {"foo@example.com"}),
+            Arguments.of("messages.email-notice", "en-US", "Your email foo@example.com has been registered.", new Object[] {"foo@example.com"}),
+            Arguments.of("default-message", "en-US", "This is a default message.", null),
+            Arguments.of("messages.default-message", "en-US", "This is a default message.", null),
+            Arguments.of("payment.headline", "en-US", "Payment", null),
+            Arguments.of("payment.expiry_date", "en-US", "Expiration date", null),
+
+            Arguments.of("headline", "de", "Überschrift", null),
+            Arguments.of("messages.headline", "de", "Überschrift", null),
+            Arguments.of("postcode", "de", "Postleitzahl", null),
+            Arguments.of("messages.postcode", "de", "Postleitzahl", null),
+            Arguments.of("email-notice", "de", "Ihre E-Mail foo@example.com wurde registriert.", new Object[] {"foo@example.com"}),
+            Arguments.of("messages.email-notice", "de", "Ihre E-Mail foo@example.com wurde registriert.", new Object[] {"foo@example.com"}),
+            Arguments.of("default-message", "de", "Das ist ein Standardtext.", null),
+            Arguments.of("messages.default-message", "de", "Das ist ein Standardtext.", null),
+            Arguments.of("payment.headline", "de", "Zahlung", null),
+            Arguments.of("payment.expiry_date", "de", "Ablaufdatum", null),
+
+            Arguments.of("headline", "jp", "Headline", null),
+            Arguments.of("messages.headline", "jp", "Headline", null),
+            Arguments.of("postcode", "jp", "Postcode", null),
+            Arguments.of("messages.postcode", "jp", "Postcode", null),
+            Arguments.of("email-notice", "jp", "Your email foo@example.com has been registered.", new Object[] {"foo@example.com"}),
+            Arguments.of("messages.email-notice", "jp", "Your email foo@example.com has been registered.", new Object[] {"foo@example.com"}),
+            Arguments.of("default-message", "jp", "This is a default message.", null),
+            Arguments.of("messages.default-message", "jp", "This is a default message.", null),
+            Arguments.of("payment.headline", "jp", "Payment", null),
+            Arguments.of("payment.expiry_date", "jp", "Expiry date", null)
+        );
+    }
+}