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is a variable defined at the end of the pom.xml file. It can be helpful to move this variable into your root pom.xml. If defined there all subprojects will have this variable automatically. If you want to move to another servicemix version later
on it is just a matter of changing this variable in the root pom instead of touching each single pom in your project.
This will ease the maintainance of the project a lot. The same can be done for repositories as well. If you do so, you should remove these things from the pom files in the subprojects.

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