---
title: "Invoice V3.1 · fftType"
canonical: "https://knowledge-hub.onetrail.com/space/docs/726237277/Invoice%20V3.1%20%C2%B7%20fftType"
format: markdown
---
**Complex type** in namespace `http://www.onetrail.net` · part of [Invoice V3.1](https://onetrail.atlassian.net/wiki/spaces/docs/pages/718701262)

## Diagram

![fftType diagram](media://58839c44-78bd-46a1-86c9-099ea15177b9)

## Content

Text content of type `xsd:string`, with the attributes below.

## Attributes

| Attribute | Type | Use | Description |
| --- | --- | --- | --- |
| **@lang** | `xsd:string`, length 2 | optional | Please use ISO 639-1, 2-letter codes in capitals. |

## Used by

- [FreeFormTextType](https://onetrail.atlassian.net/wiki/spaces/docs/pages/726564939) / **FreeFormText**

<details>
<summary>XSD source</summary>

```xml
<xsd:complexType name="fftType">
        <xsd:simpleContent>
            <xsd:extension base="xsd:string">
                <xsd:attribute name="lang">
                    <xsd:annotation>
                        <xsd:documentation xml:lang="EN">Please use ISO 639-1, 2-letter codes in capitals.</xsd:documentation>
                    </xsd:annotation>
                    <xsd:simpleType>
                        <xsd:restriction base="xsd:string">
                            <xsd:minLength value="2"/>
                            <xsd:maxLength value="2"/>
                        </xsd:restriction>
                    </xsd:simpleType>
                </xsd:attribute>
            </xsd:extension>
        </xsd:simpleContent>
    </xsd:complexType>

```
</details>