> ## Documentation Index
> Fetch the complete documentation index at: https://gobl-gbl-68-converter-mapping.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

Converters turn a GOBL document into a local or international format — and back
again. Unlike [addons](/addons/overview), which augment a GOBL document with
extra normalization and validation, a converter performs a structural mapping
between GOBL and another schema such as UBL or CII.

Each converter lives in its own Go module (for example
[gobl.ubl](https://github.com/invopop/gobl.ubl)). The field mappings documented
in this section are built by joining two data sources on the shared
[EN16931](/addons/eu-en16931-v2017) Business Term:

* the **GOBL → Business Term** mapping, maintained in this documentation repository, and
* the **Business Term → target format** mapping, imported directly from the converter's module.

Because both legs are data keyed by Business Term, the full GOBL → target
mapping is generated deterministically rather than hand-written, and stays in
step with the converter it documents.