protected function validateConcreteNode(ArrayNode $node)
{
$path = $node->getPath();
if (null !== $this->key) {
throw new InvalidDefinitionException(sprintf('->useAttributeAsKey() is not applicable to concrete nodes at path "%s"', $path));
}
if (true === $this->atLeastOne) {
throw new InvalidDefinitionException(sprintf('->requiresAtLeastOneElement() is not applicable to concrete nodes at path "%s"', $path));
}
if ($this->default) {
throw new InvalidDefinitionException(sprintf('->defaultValue() is not applicable to concrete nodes at path "%s"', $path));
}
if (false !== $this->addDefaultChildren) {
throw new InvalidDefinitionException(sprintf('->addDefaultChildrenIfNoneSet() is not applicable to concrete nodes at path "%s"', $path));
}
}
