// XML schema and this will not change anytime soon. We do not want to build effective models based on
            // models without a version starting with 3.4.
            validateStringNotEmpty("modelVersion", problems, Severity.ERROR, Version.V20, m.getModelVersion(), m);

            validateModelVersion(problems, m.getModelVersion(), m, "4.0.0");

    }

    private static ModelSource createStubModelSource(Artifact artifact) {
        String xml = "<?xml version='1.0'?>" + "<project>"
                + "<modelVersion>4.0.0</modelVersion>"
                + "<groupId>"
                + artifact.getGroupId() + "</groupId>" + "<artifactId>"
                + artifact.getArtifactId() + "</artifactId>" + "<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<artifactId>fess</artifactId>
	<version>15.4.0-SNAPSHOT</version>
	<packaging>war</packaging>
	<name>Fess</name>
	<description>Fess is Full tExt Search System.</description>
	<url>https://fess.codelibs.org/</url>

    }

    @SuppressWarnings("checkstyle:MethodLength")
    private void testCompleteModel(PomTestWrapper pom) throws Exception {
        assertEquals("4.0.0", pom.getValue("modelVersion"));

        assertEquals("org.apache.maven.its.mng", pom.getValue("groupId"));
        assertEquals("test", pom.getValue("artifactId"));
        assertEquals("0.2", pom.getValue("version"));