---
title: "UblWriter – API-Referenz · Quittio"
description: "Writes OASIS UBL 2.1 Invoice and CreditNote documents according to the EN 16931 binding (CEN/TS 16931-3-2). Credit note type codes produce a CreditNote document."
canonical_url: "https://quittio.dev/docs/api/Quittio/Core/Xml/Ubl/UblWriter"
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---

> Index of every page on this site: [llms.txt](https://quittio.dev/llms.txt)

[API reference](https://quittio.dev/docs/api) / [Quittio](https://quittio.dev/docs/api/Quittio) \\ [Core](https://quittio.dev/docs/api/Quittio/Core) \\ [Xml](https://quittio.dev/docs/api/Quittio/Core/Xml) \\ [Ubl](https://quittio.dev/docs/api/Quittio/Core/Xml/Ubl)

# UblWriter

final class in quittio/core · implements [`XmlSerializer`](https://quittio.dev/docs/api/Quittio/Core/Xml/XmlSerializer)

`Quittio\Core\Xml\Ubl\UblWriter` · [Source](https://github.com/Quittio/quittio/blob/v0.7.1/packages/core/src/Xml/Ubl/UblWriter.php#L20)

Writes OASIS UBL 2.1 Invoice and CreditNote documents according to the EN 16931 binding (CEN/TS 16931-3-2). Credit note type codes produce a CreditNote document.

## Constants \#

| Constant | Value | Description |
| --- | --- | --- |
| `NS_CAC` | `'urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2'` | |
| `NS_CBC` | `'urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2'` | |
| `NS_CREDIT_NOTE` | `'urn:oasis:names:specification:ubl:schema:xsd:CreditNote-2'` | |
| `NS_INVOICE` | `'urn:oasis:names:specification:ubl:schema:xsd:Invoice-2'` | |

## Methods \#

| Method | Description |
| --- | --- |
| `->serialize()` | |
| `->syntax()` | |

### `serialize()`#

```
public function serialize(
    InvoiceData $invoice,
    Profile $profile,
    SerializationOptions $options = new \Quittio\Core\Xml\SerializationOptions(),
): string
```

| Parameter | Type | Description |
| --- | --- | --- |
| `$invoice` | `[InvoiceData](https://quittio.dev/docs/api/Quittio/Core/Data/InvoiceData)` | |
| `$profile` | `[Profile](https://quittio.dev/docs/api/Quittio/Core/Profiles/Profile)` | |
| `$options` | `[SerializationOptions](https://quittio.dev/docs/api/Quittio/Core/Xml/SerializationOptions)` = `new \Quittio\Core\Xml\SerializationOptions()` | |

<dl><dt>Returns</dt>
<dd><code>string</code></dd>
</dl>

### `syntax()`#

```
public function syntax(): Syntax
```

<dl><dt>Returns</dt>
<dd><code><a href="https://quittio.dev/docs/api/Quittio/Core/Profiles/Syntax">Syntax</a></code></dd>
</dl>

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```