public ClassDescriptor buildChildDescriptor() {
    XMLDescriptor descriptor = new XMLDescriptor();
    descriptor.setJavaClass(AnyCollectionChild.class);
    descriptor.setDefaultRootElement("child");
    descriptor.addRootElement("someChild");

    XMLDirectMapping mapping = new XMLDirectMapping();
    mapping.setAttributeName("content");
    mapping.setGetMethodName("getContent");
    mapping.setSetMethodName("setContent");
    mapping.setXPath("text()");
    descriptor.addMapping(mapping);

    return descriptor;
  }