How Maven neutron modules reference properties in parent modules

I now have a maven project with three submodules in it, defined in the parent project
<properties>
  <org.springframework.version>3.1.0.RELEASE</org.springframework.version>
    <project.build.sourceEncoding>UTF- 8</project.build.sourceEncoding>
  </properties>

I want to refer to one of my submodules:
org.springframework.version This configuration, how should I configure it?
Thanks!