validatePrototypeNode example

$this->validateConcreteNode($node);

            $node->setAddIfNotSet($this->addDefaults);

            foreach ($this->children as $child) {
                $child->parent = $node;
                $node->addChild($child->getNode());
            }
        } else {
            $node = new PrototypedArrayNode($this->name, $this->parent, $this->pathSeparator);

            $this->validatePrototypeNode($node);

            if (null !== $this->key) {
                $node->setKeyAttribute($this->key, $this->removeKeyItem);
            }

            if (true === $this->atLeastOne || false === $this->allowEmptyValue) {
                $node->setMinNumberOfElements(1);
            }

            if ($this->default) {
                if (!\is_array($this->defaultValue)) {