            $schema->add(
                $d->id->key,
                $d->default,
                $d->type,
                $d->typeAllowsNull
            );
            if ($d->allowed !== null) {
                $schema->addAllowedValues(
                    $d->id->key,
                    $d->allowed
                );
            }
            foreach ($d->aliases as $alias) {
                $schema->addAlias(
                    $alias->key,
                    $d->id->key
                );
            }
            if ($d->valueAliases !== null) {
                $schema->addValueAliases(
                    $d->id->key,
                    $d->valueAliases
                );
            }
        }
        $schema->postProcess();
        return $schema;
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.