model = builder.build();
        String modelVersion = new MavenModelVersion().getModelVersion(model);
        if (!ModelBuilder.MODEL_VERSION_4_0_0.equals(modelVersion) && !preserveModelVersion) {
            warnNotDowngraded(project);
        }
        model = model.withModelVersion(modelVersion);

        return model;
    }

<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 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>org.codelibs.fess</groupId>
	<artifactId>fess-crawler-parent</artifactId>
	<version>15.4.1-SNAPSHOT</version>
	<packaging>pom</packaging>
	<name>Fess Crawler Project</name>

<?xml version="1.0"?>
<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 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<artifactId>fess-crawler-lasta</artifactId>
	<packaging>jar</packaging>
	<name>Fess Crawler for LastaFlute</name>
	<description>This is LastaFlute support.</description>
	<parent>

<?xml version="1.0"?>
<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 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<artifactId>fess-crawler-opensearch</artifactId>
	<packaging>jar</packaging>
	<name>Fess Crawler OpenSearch</name>
	<parent>
		<groupId>org.codelibs.fess</groupId>
		<artifactId>fess-crawler-parent</artifactId>

<?xml version="1.0"?>
<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 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>org.codelibs</groupId>
	<artifactId>corelib</artifactId>
	<packaging>jar</packaging>
	<name>CodeLibs Core Library</name>
	<version>0.7.2-SNAPSHOT</version>

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<artifactId>fess-suggest</artifactId>
	<version>15.4.1-SNAPSHOT</version>
	<packaging>jar</packaging>
	<name>fess-suggest</name>
	<url>https://fess.codelibs.org/</url>
	<inceptionYear>2009</inceptionYear>

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>org.codelibs</groupId>
	<artifactId>curl4j</artifactId>
	<version>1.3.2-SNAPSHOT</version>
	<packaging>jar</packaging>
	<name>cUrl-Like Java client</name>
	<description>cUrl-Like Java client</description>

<?xml version="1.0"?>
<project>
    <modelVersion>4.0.0</modelVersion>
    <name>Gradle_Check Config DSL Script</name>
    <properties>
        <mockk.version>1.14.7</mockk.version>
        <bytebuddy.version>1.18.3</bytebuddy.version>
        <jackson.version>2.20.1</jackson.version>
        <junit.version>6.0.1</junit.version>
        <dslContextParameter.branch>master</dslContextParameter.branch>

-->
<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>org.apache.maven</groupId>
    <artifactId>maven-compat-modules</artifactId>
    <version>4.1.0-SNAPSHOT</version>
  </parent>

-->
<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>org.apache.maven</groupId>
    <artifactId>maven-compat-modules</artifactId>
    <version>4.1.0-SNAPSHOT</version>
  </parent>

  <artifactId>maven-compat</artifactId>