<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
  <id>massembly-148-example</id>
  <formats>
    <format>dir</format>
    <format>zip</format>
  </formats>
  <includeBaseDirectory>false</includeBaseDirectory>
  <files>
    <file>
      <source>src/config/a/file.txt</source>
      <outputDirectory>a</outputDirectory>
      <filtered>true</filtered>
    </file>
    <file>
      <source>src/config/b/file.txt</source>
      <outputDirectory>b</outputDirectory>
      <destName>file.txt</destName>
      <filtered>true</filtered>
    </file>
  </files>
</assembly>