perform-with-flat-structure.xml

<?xml version="1.0" encoding="UTF-8"?>
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<project>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-release-plugin</artifactId>
        <configuration>
          <settings implementation="org.apache.maven.settings.Settings"/>
          <project implementation="org.apache.maven.plugins.release.stubs.FlatMultiModuleMavenProjectStub"/>
          <reactorProjects>
            <reactorProject implementation="org.apache.maven.plugins.release.stubs.FlatMultiModuleMavenProjectStub"/>
          </reactorProjects>
          <workingDirectory>${basedir}/target/checkout</workingDirectory>
          <useReleaseProfile>true</useReleaseProfile>
          <tag>test-tag</tag>
          <connectionUrl>scm:svn:file://localhost/target/svnroot/flat-multi-module/trunk/root-project</connectionUrl>
          <goals>deploy</goals>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>