Jackalope\NodeType\NodeType::canRemoveProperty PHP Method

    public function canRemoveProperty($propertyName, $throw = false)
    {
        $propDefs = $this->getPropertyDefinitions();
        foreach ($propDefs as $prop) {
            if ($propertyName === $prop->getName() && ($prop->isMandatory() || $prop->isProtected())) {
                if ($throw) {
                    if ($prop->isMandatory()) {
                        $errorMsg = "Can't remove the mandatory property: " . $prop->getName();
                    } else {
                        $errorMsg = "Can't remove the protected property: " . $prop->getName();
                    }
                    throw new ConstraintViolationException($errorMsg);
                }
                return false;
            }
        }
        return true;
    }