<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>bin</id>
  <formats>
    <format>dir</format>
  </formats>
  <includeBaseDirectory>false</includeBaseDirectory>
  
  <dependencySets>
    <dependencySet>
    <outputDirectory>some_directory</outputDirectory>
    <outputFileNameMapping>${artifact.artifactId}.${artifact.extension}</outputFileNameMapping>
    <unpack>true</unpack>
    </dependencySet>
  </dependencySets>
  
</assembly>