diff --git a/impl/README.md b/impl/README.md
index e041285da..931a66df2 100644
--- a/impl/README.md
+++ b/impl/README.md
@@ -70,17 +70,26 @@ This reference implementation can run workflows consisting of:
 
 This SDK is modular by design—pull in only what you need:
 
-* **`serverlessworkflow-impl-core`**
+* **serverlessworkflow-impl-core**
   Workflow engine & core interfaces. Depends on generated types and CloudEvents SDK.
 
-* **`serverlessworkflow-impl-jackson`**
-  Adds Jackson integration, JQ expressions, JSON Schema validation, and CloudEvents (de)serialization.
+* **serverlessworkflow-impl-jackson**
   👉 **Most users add this one.**
-
-* **`serverlessworkflow-impl-http`**
+  
+  Adds Jackson integration, JQ expressions, JSON Schema validation, and CloudEvents (de)serialization.
+  
+  Internally, this module is an aggregation of smaller modules to allow part replacement if needed:
+    * **serverlessworkflow-impl-jq** JQ expression implementation
+    * **serverlessworkflow-impl-model** Jackson model implementation
+    * **serverlessworkflow-impl-validation** Schema validation implementation
+    * **serverlessworkflow-impl-lifecycle-events** Enable publication of lifecycle events as Json cloud events. 
+    * **serverlessworkflow-impl-json** Json common utilities shared by all modules in this list
+    
+    
+* **serverlessworkflow-impl-http**
   HTTP `Call` task handler.
 
-* **`serverlessworkflow-impl-jackson-jwt`**
+* **serverlessworkflow-impl-jackson-jwt**
   OAuth2/OIDC helpers for HTTP calls.
 
 There are also companion modules/docs for:
diff --git a/impl/jackson/pom.xml b/impl/jackson/pom.xml
index 1f123648c..3690fafa3 100644
--- a/impl/jackson/pom.xml
+++ b/impl/jackson/pom.xml
@@ -6,23 +6,28 @@
     <version>8.0.0-SNAPSHOT</version>
   </parent>
   <artifactId>serverlessworkflow-impl-jackson</artifactId>
+  <packaging>pom</packaging>
   <name> Serverless Workflow :: Impl :: Jackson  </name>
  <dependencies>
-        <dependency>
-            <groupId>io.serverlessworkflow</groupId>
-            <artifactId>serverlessworkflow-impl-core</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>io.serverlessworkflow</groupId>
-            <artifactId>serverlessworkflow-api</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>io.cloudevents</groupId>
-            <artifactId>cloudevents-json-jackson</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>com.networknt</groupId>
-            <artifactId>json-schema-validator</artifactId>
-        </dependency>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-core</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-jq</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-model</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-validation</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-lifecycle-events</artifactId>
+    </dependency>
     </dependencies>
 </project>
\ No newline at end of file
diff --git a/impl/jq/pom.xml b/impl/jq/pom.xml
index 451ab5553..909ace32b 100644
--- a/impl/jq/pom.xml
+++ b/impl/jq/pom.xml
@@ -8,25 +8,30 @@
   <artifactId>serverlessworkflow-impl-jq</artifactId>
   <name> Serverless Workflow :: Impl :: JQ  </name>
   <dependencies>
-        <dependency>
-            <groupId>net.thisptr</groupId>
-            <artifactId>jackson-jq</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>io.serverlessworkflow</groupId>
-            <artifactId>serverlessworkflow-impl-jackson</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-engine</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-core</artifactId>
-        </dependency>
+    <dependency>
+        <groupId>net.thisptr</groupId>
+        <artifactId>jackson-jq</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-json</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>org.junit.jupiter</groupId>
+        <artifactId>junit-jupiter-engine</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>org.assertj</groupId>
+        <artifactId>assertj-core</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>org.mockito</groupId>
+        <artifactId>mockito-core</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-model</artifactId>
+        <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>
\ No newline at end of file
diff --git a/impl/json-utils/pom.xml b/impl/json-utils/pom.xml
new file mode 100644
index 000000000..57627413b
--- /dev/null
+++ b/impl/json-utils/pom.xml
@@ -0,0 +1,24 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>io.serverlessworkflow</groupId>
+    <artifactId>serverlessworkflow-impl</artifactId>
+    <version>8.0.0-SNAPSHOT</version>
+  </parent>
+  <artifactId>serverlessworkflow-impl-json</artifactId>
+  <name> Serverless Workflow :: Impl :: Json utils  </name>
+  <dependencies>
+    <dependency>
+        <groupId>com.fasterxml.jackson.core</groupId>
+        <artifactId>jackson-databind</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-core</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>io.cloudevents</groupId>
+        <artifactId>cloudevents-json-jackson</artifactId>
+    </dependency>
+  </dependencies>
+</project>
\ No newline at end of file
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/events/JacksonCloudEventUtils.java b/impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/JacksonCloudEventUtils.java
similarity index 96%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/events/JacksonCloudEventUtils.java
rename to impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/JacksonCloudEventUtils.java
index 61df65020..a3591a93c 100644
--- a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/events/JacksonCloudEventUtils.java
+++ b/impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/JacksonCloudEventUtils.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package io.serverlessworkflow.impl.jackson.events;
+package io.serverlessworkflow.impl.jackson;
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.NullNode;
@@ -21,7 +21,6 @@
 import io.cloudevents.CloudEvent;
 import io.cloudevents.CloudEventData;
 import io.cloudevents.jackson.JsonCloudEventData;
-import io.serverlessworkflow.impl.jackson.JsonUtils;
 import java.io.IOException;
 import java.io.UncheckedIOException;
 import java.time.OffsetDateTime;
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/JsonUtils.java b/impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/JsonUtils.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/JsonUtils.java
rename to impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/JsonUtils.java
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/MergeUtils.java b/impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/MergeUtils.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/MergeUtils.java
rename to impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/MergeUtils.java
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/ObjectMapperFactory.java b/impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/ObjectMapperFactory.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/ObjectMapperFactory.java
rename to impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/ObjectMapperFactory.java
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/ObjectMapperFactoryProvider.java b/impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/ObjectMapperFactoryProvider.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/ObjectMapperFactoryProvider.java
rename to impl/json-utils/src/main/java/io/serverlessworkflow/impl/jackson/ObjectMapperFactoryProvider.java
diff --git a/impl/lifecycleevent/pom.xml b/impl/lifecycleevent/pom.xml
new file mode 100644
index 000000000..82ba06973
--- /dev/null
+++ b/impl/lifecycleevent/pom.xml
@@ -0,0 +1,20 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>io.serverlessworkflow</groupId>
+    <artifactId>serverlessworkflow-impl</artifactId>
+    <version>8.0.0-SNAPSHOT</version>
+  </parent>
+  <artifactId>serverlessworkflow-impl-lifecycle-events</artifactId>
+  <name> Serverless Workflow :: Impl :: Jackson:: Lifecycle Events </name>
+  <dependencies>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-json</artifactId>
+    </dependency>
+     <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-core</artifactId>
+    </dependency>
+  </dependencies>
+</project>
\ No newline at end of file
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/events/JacksonLifeCyclePublisher.java b/impl/lifecycleevent/src/main/java/io/serverlessworkflow/impl/jackson/events/JacksonLifeCyclePublisher.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/events/JacksonLifeCyclePublisher.java
rename to impl/lifecycleevent/src/main/java/io/serverlessworkflow/impl/jackson/events/JacksonLifeCyclePublisher.java
diff --git a/impl/jackson/src/main/resources/META-INF/services/io.serverlessworkflow.impl.lifecycle.WorkflowExecutionListener b/impl/lifecycleevent/src/main/resources/META-INF/services/io.serverlessworkflow.impl.lifecycle.WorkflowExecutionListener
similarity index 100%
rename from impl/jackson/src/main/resources/META-INF/services/io.serverlessworkflow.impl.lifecycle.WorkflowExecutionListener
rename to impl/lifecycleevent/src/main/resources/META-INF/services/io.serverlessworkflow.impl.lifecycle.WorkflowExecutionListener
diff --git a/impl/model/pom.xml b/impl/model/pom.xml
new file mode 100644
index 000000000..c73779712
--- /dev/null
+++ b/impl/model/pom.xml
@@ -0,0 +1,20 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>io.serverlessworkflow</groupId>
+    <artifactId>serverlessworkflow-impl</artifactId>
+    <version>8.0.0-SNAPSHOT</version>
+  </parent>
+  <artifactId>serverlessworkflow-impl-model</artifactId>
+  <name> Serverless Workflow :: Impl :: Jackson:: Model  </name>
+  <dependencies>
+    <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-json</artifactId>
+    </dependency>
+     <dependency>
+        <groupId>io.serverlessworkflow</groupId>
+        <artifactId>serverlessworkflow-impl-core</artifactId>
+    </dependency>
+  </dependencies>
+</project>
\ No newline at end of file
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModel.java b/impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModel.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModel.java
rename to impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModel.java
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelCollection.java b/impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelCollection.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelCollection.java
rename to impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelCollection.java
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelDeserializer.java b/impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelDeserializer.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelDeserializer.java
rename to impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelDeserializer.java
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelFactory.java b/impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelFactory.java
similarity index 98%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelFactory.java
rename to impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelFactory.java
index cb2516143..810207618 100644
--- a/impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelFactory.java
+++ b/impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelFactory.java
@@ -27,8 +27,8 @@
 import io.serverlessworkflow.impl.WorkflowModel;
 import io.serverlessworkflow.impl.WorkflowModelCollection;
 import io.serverlessworkflow.impl.WorkflowModelFactory;
+import io.serverlessworkflow.impl.jackson.JacksonCloudEventUtils;
 import io.serverlessworkflow.impl.jackson.JsonUtils;
-import io.serverlessworkflow.impl.jackson.events.JacksonCloudEventUtils;
 import java.math.BigDecimal;
 import java.time.OffsetDateTime;
 import java.util.Map;
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelSerializer.java b/impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelSerializer.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelSerializer.java
rename to impl/model/src/main/java/io/serverlessworkflow/impl/model/jackson/JacksonModelSerializer.java
diff --git a/impl/jackson/src/main/resources/META-INF/services/io.serverlessworkflow.impl.WorkflowModelFactory b/impl/model/src/main/resources/META-INF/services/io.serverlessworkflow.impl.WorkflowModelFactory
similarity index 100%
rename from impl/jackson/src/main/resources/META-INF/services/io.serverlessworkflow.impl.WorkflowModelFactory
rename to impl/model/src/main/resources/META-INF/services/io.serverlessworkflow.impl.WorkflowModelFactory
diff --git a/impl/persistence/jackson-marshaller/pom.xml b/impl/persistence/jackson-marshaller/pom.xml
index 322a557ce..7cd1447b8 100644
--- a/impl/persistence/jackson-marshaller/pom.xml
+++ b/impl/persistence/jackson-marshaller/pom.xml
@@ -14,7 +14,7 @@
         </dependency>
         <dependency>
             <groupId>io.serverlessworkflow</groupId>
-            <artifactId>serverlessworkflow-impl-jackson</artifactId>
+            <artifactId>serverlessworkflow-impl-model</artifactId>
         </dependency>
     </dependencies>
 </project>
\ No newline at end of file
diff --git a/impl/pom.xml b/impl/pom.xml
index fe4f6bd32..8996325f8 100644
--- a/impl/pom.xml
+++ b/impl/pom.xml
@@ -27,6 +27,31 @@
                 <artifactId>serverlessworkflow-impl-http</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>io.serverlessworkflow</groupId>
+                <artifactId>serverlessworkflow-impl-json</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.serverlessworkflow</groupId>
+                <artifactId>serverlessworkflow-impl-jq</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.serverlessworkflow</groupId>
+                <artifactId>serverlessworkflow-impl-model</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+             <dependency>
+                <groupId>io.serverlessworkflow</groupId>
+                <artifactId>serverlessworkflow-impl-validation</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+             <dependency>
+                <groupId>io.serverlessworkflow</groupId>
+                <artifactId>serverlessworkflow-impl-lifecycle-events</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>io.serverlessworkflow</groupId>
                 <artifactId>serverlessworkflow-persistence-api</artifactId>
@@ -57,11 +82,6 @@
                 <artifactId>serverlessworkflow-impl-jackson</artifactId>
                 <version>${project.version}</version>
             </dependency>
-            <dependency>
-                <groupId>io.serverlessworkflow</groupId>
-                <artifactId>serverlessworkflow-impl-jq</artifactId>
-                <version>${project.version}</version>
-            </dependency>
             <dependency>
                 <groupId>net.thisptr</groupId>
                 <artifactId>jackson-jq</artifactId>
@@ -104,5 +124,9 @@
         <module>persistence</module>
         <module>test</module>
         <module>jq</module>
+        <module>json-utils</module>
+        <module>model</module>
+        <module>lifecycleevent</module>
+        <module>validation</module>
     </modules>
 </project>
\ No newline at end of file
diff --git a/impl/test/pom.xml b/impl/test/pom.xml
index 32bc56756..f861f9c55 100644
--- a/impl/test/pom.xml
+++ b/impl/test/pom.xml
@@ -29,10 +29,6 @@
             <groupId>io.serverlessworkflow</groupId>
             <artifactId>serverlessworkflow-impl-http</artifactId>
         </dependency>
-        <dependency>
-            <groupId>io.serverlessworkflow</groupId>
-            <artifactId>serverlessworkflow-impl-jq</artifactId>
-        </dependency>
         <dependency>
             <groupId>io.serverlessworkflow</groupId>
             <artifactId>serverlessworkflow-impl-jackson-jwt</artifactId>
diff --git a/impl/validation/pom.xml b/impl/validation/pom.xml
new file mode 100644
index 000000000..b8b77ed69
--- /dev/null
+++ b/impl/validation/pom.xml
@@ -0,0 +1,28 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>io.serverlessworkflow</groupId>
+    <artifactId>serverlessworkflow-impl</artifactId>
+    <version>8.0.0-SNAPSHOT</version>
+  </parent>
+  <artifactId>serverlessworkflow-impl-validation</artifactId>
+  <name> Serverless Workflow :: Impl :: Jackson:: Validation  </name>
+  <dependencies>
+         <dependency>
+            <groupId>com.networknt</groupId>
+            <artifactId>json-schema-validator</artifactId>
+        </dependency>
+         <dependency>
+            <groupId>io.serverlessworkflow</groupId>
+            <artifactId>serverlessworkflow-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.serverlessworkflow</groupId>
+            <artifactId>serverlessworkflow-impl-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.serverlessworkflow</groupId>
+            <artifactId>serverlessworkflow-impl-json</artifactId>
+        </dependency>
+  </dependencies>
+</project>
\ No newline at end of file
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/schema/JsonSchemaValidator.java b/impl/validation/src/main/java/io/serverlessworkflow/impl/jackson/schema/JsonSchemaValidator.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/schema/JsonSchemaValidator.java
rename to impl/validation/src/main/java/io/serverlessworkflow/impl/jackson/schema/JsonSchemaValidator.java
diff --git a/impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/schema/JsonSchemaValidatorFactory.java b/impl/validation/src/main/java/io/serverlessworkflow/impl/jackson/schema/JsonSchemaValidatorFactory.java
similarity index 100%
rename from impl/jackson/src/main/java/io/serverlessworkflow/impl/jackson/schema/JsonSchemaValidatorFactory.java
rename to impl/validation/src/main/java/io/serverlessworkflow/impl/jackson/schema/JsonSchemaValidatorFactory.java
diff --git a/impl/jackson/src/main/resources/META-INF/services/io.serverlessworkflow.impl.schema.SchemaValidatorFactory b/impl/validation/src/main/resources/META-INF/services/io.serverlessworkflow.impl.schema.SchemaValidatorFactory
similarity index 100%
rename from impl/jackson/src/main/resources/META-INF/services/io.serverlessworkflow.impl.schema.SchemaValidatorFactory
rename to impl/validation/src/main/resources/META-INF/services/io.serverlessworkflow.impl.schema.SchemaValidatorFactory