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# The Apertium machine translation platform: Five years on

**Authors:** [Mikel L. Forcada](https://md.mova.elamur.ai/free/en/docs/papers/authors/mikel-l-forcada/), [Francis M. Tyers](https://md.mova.elamur.ai/free/en/docs/papers/authors/francis-m-tyers/), [Gema Ramírez-Sánchez](https://md.mova.elamur.ai/free/en/docs/papers/authors/gema-ramirez-sanchez/) · **Year:** 2009 · **Venue:** First International Workshop on Free/Open-Source Rule-Based Machine Translation **Link:** [aclanthology.org/2009.freeopmt-1.3](https://aclanthology.org/2009.freeopmt-1.3/) · **Licence:** [CC BY-NC-SA 3.0](https://creativecommons.org/licenses/by-nc-sa/3.0/) — summary only

[**22** citations](https://openalex.org/works?filter=cites:W1572706080) openalex-snapshot · 2026-10-14[**8** citations in our library](https://md.mova.elamur.ai/free/en/docs/papers/cited-by/forcada-2009-apertium-machine-translation-platform-five/) of the 140673 papers whose bibliographies we read[Proceedings of the First International Workshop on Free/Open-Source Rule-Based Machine Translation](https://aclanthology.org/volumes/2009.freeopmt-1/)[licence](https://creativecommons.org/licenses/by-nc-sa/3.0/)

- [Publisher's page](https://aclanthology.org/2009.freeopmt-1.3/)
- [PDF](https://aclanthology.org/2009.freeopmt-1.3.pdf)
- [OpenAlex](https://openalex.org/W1572706080)

**Authors (3)**

1. [Mikel L. Forcada](https://openalex.org/A5001715786) [ORCID](https://orcid.org/0000-0003-0843-6442) · [Semantic Scholar](https://www.semanticscholar.org/author/2586725) · h 24 · 2351 citations · 207 works
2. [Francis M. Tyers](https://openalex.org/A5076604380) [ORCID](https://orcid.org/0000-0001-6108-2220) · [Semantic Scholar](https://www.semanticscholar.org/author/3262036) · h 21 · 2530 citations · 154 works
3. Gema Ramírez-Sánchez

Citations and author metrics from openalex-snapshot (2026-10-14); authors with the same name are not always told apart.

## What it is about

A retrospective of Apertium after five years: how a consortium of Spanish universities and companies turned two inherited MT systems into a free engine with data for many language pairs. The paper sets out the design philosophy: start from word-for-word translation and add lexical processing, tagging and local reordering rules; keep the engine separate from the language data; use copyleft so that the shared data stays shared. It describes the modular pipeline, a developer community of more than a hundred people, the research built on the platform, and the business models around it. It ends with the open challenges, chiefly extending a shallow-transfer design from closely related languages to distant ones. No new measurement is reported.

## Ideas

- I1. Make word-for-word the explicit floor of the translator. In tools/translate every layer should be reported against a per-author word-for-word baseline, so a gain from the meta-world or the encoder is a gain over something that is measured the same way.
- I2. Treat reproducibility as a gate, not a remark. Each published translator number should be rebuildable from the data files and the seed alone, in a fresh checkout, with two identical runs. The paper's argument for free software is the same argument behind Mova's determinism rule.
- I3. Track the cost of distance. Apertium needed extra machinery for less related pairs. For the Hebrew reader, measure how the error splits by distance between the source tree and the meta-world (for example by the number of relations that change head), not only by a single score.

## For Mova

The code is tools/translate (hebrew.rs, meta.rs, measure.rs) and tools/roundtrip. The word-for-word floor belongs in measure.rs; the distance split belongs with the Hebrew reader, which is the weakest part of the translator. The shallow-transfer architecture is not for Mova, because Mova works from trees and frames, but the reproducibility and baseline habits carry over directly.

Topics: [Machine translation](https://md.mova.elamur.ai/free/en/docs/papers/topics/machine-translation/)

## Cite

The paper itself, not this card. BibTeX from the library's record of the work.

```
@inproceedings{forcada2009apertium,
  title = {{The Apertium machine translation platform: Five years on}},
  author = {Forcada, Mikel L. and Tyers, Francis M. and Ramírez-Sánchez, Gema},
  booktitle = {Proceedings of the First International Workshop on Free/Open-Source Rule-Based Machine Translation},
  year = {2009},
  url = {https://aclanthology.org/2009.freeopmt-1.3/}
}
```

- [← previous SEM-I Rational MT: Enriching Deep Grammars with a Semantic Interface for Scalable Machine Translation](https://md.mova.elamur.ai/free/en/docs/papers/flickinger-2005-sem-i-rational-mt-enriching/)
- [next → Apertium: a free/open source platform for machine translation and basic language technology](https://md.mova.elamur.ai/free/en/docs/papers/forcada-2016-apertium-free-open-source-platform/)
- [↑ back to Machine translation](https://md.mova.elamur.ai/free/en/docs/papers/mtrans/)

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