src/it/projects/mojo-configuration/ignoreDirFormatExtensions/pom.xml

<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>
  <parent>
    <groupId>org.apache.maven.plugin.assembly.test</groupId>
    <artifactId>it-project-parent</artifactId>
    <version>1</version>
  </parent>
  
  <artifactId>ignoreDirFormatExtensions</artifactId>
  <packaging>jar</packaging>
  
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <id>src</id>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
            <configuration>
              <descriptors>
                <descriptor>src/main/assembly/src.xml</descriptor>
              </descriptors>
            </configuration>
          </execution>
          <execution>
            <id>src2</id>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
            <configuration>
              <descriptors>
                <descriptor>src/main/assembly/src2.xml</descriptor>
              </descriptors>
              <ignoreDirFormatExtensions>false</ignoreDirFormatExtensions>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>