src/Validation/Spec/AbstractValidator.php
protected function isNotFound(string $type, string $id): bool
    {
        return !$this->store->exists(ResourceIdentifier::create($type, $id));
    }
protected function isNotFound(string $type, string $id): bool
    {
        return !$this->store->exists(ResourceIdentifier::create($type, $id));
    }
Check if the resource is not found.

@param string $type
@param string $id
@return bool