<?xml version="1.0" encoding="ASCII"?>
<package_a:AContainer xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:package_a="http://package_a" xmlns:package_b="http://package_b">
  <elements xsi:type="package_a:A"/>
  <elements xsi:type="package_b:B"/>
</package_a:AContainer>