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http://quedig.com/questions/6306626/how-to-override-maven-release-plugin-config-in-one-child-module/

Parent POM

<configuration>
  <items>
    <item>parent-1</item>
    <item>parent-2</item>
  </items>
  <properties>
    <parentKey>parent</parentKey>
  </properties>
</configuration>

Child pom

<configuration>
  <items combine.children="append">
    <!-- combine.children="merge" is the default -->
    <item>child-1</item>
  </items>
  <properties combine.self="override">
    <!-- combine.self="merge" is the default -->
    <childKey>child</childKey>
  </properties>
</configuration>