public function define($name)
{
if (isset($this->definitions[$name])) {
throw new DefinitionAlreadyDefinedException($name);
}
if (strpos($name, ':') !== false) {
$group = current(explode(':', $name));
$class = str_replace($group . ':', '', $name);
$this->definitions[$name] = clone $this->getDefinition($class);
$this->definitions[$name]->setGroup($group);
} else {
$this->definitions[$name] = new Definition($name);
}
return $this->definitions[$name];
}