ZurichNLP/mediomatix-raw

General Information

Release of the Mediomatix corpus, prepared by UZH and PHGR, to be used for research purposes only.

In mediomatix-raw, we release the full Mediomatix schoolbooks' text for each idiom. The data points are unaligned. See here for the mulit-parallel, aligned Mediomatix corpus.

We use the following Romansh idiom codes as subsets in the dataset:

• Sursilvan: rm-sursilv
• Sutsilvan: rm-sutsilv
• Surmiran: rm-surmiran
• Puter: rm-puter
• Vallader: rm-vallader

The splits in each subset are:

• train: Text from year 2 and 3 schoolbooks
• validation: Text from year 4 schoolbooks
• test: Text from year 5 schoolbooks
• no_surmiran: Text from years 6-9; available for all idioms except rm-surmiran

Each data point contains the following columns:

• CmsElementID: An id referring to which CMS element a text was extracted from.
• segmentID: A unique id for each row; differentiates between segments split apart from the same CMS element.
• text: The extracted plain text from within an HTML segment
• html: The extracted text, including any HTML markup
• chapter: The name of the chapter from which a text was extracted
• book: A code referring to the grade, volume, and type of school book

Book names are encoded in the "book" column as follows:

• The first digit refers to the school year of the book
• The next refers to the book volums for that school year
• The two letter code indicates whether the segment comes from the student workbook ("wb") or teacher's commentary ("tc")
• Example: Book "5.1_tc" refers to teacher's commentary for Volume 1 of the year 5 schoolbook.

How to Use

The subset for a specific Romansh idiom must be specified when loading the datset:

from datasets import load_dataset

sursilv = load_dataset("ZurichNLP/mediomatix-raw","rm-sursilv")

# Load Train set:

train_set = sursilv['train']

# Load Validation set:

val_set = sursilv['validation']

# Load Test set:

test_set = sursilv['test']

# Load no-rm-surmiran if the subset is not rm-surmiran
no_surm = sursilv['no_surmiran']

Citation

@inproceedings{hopton-etal-2026-mediomatix,
    title = "The Mediomatix Corpus: Parallel Data for {R}omansh Language Varieties via Comparable Schoolbooks",
    author = {Hopton, Zachary William  and
      Vamvas, Jannis  and
      B{\"u}chler, Andrin  and
      Rutkiewicz, Anna  and
      Cathomas, Rico  and
      Sennrich, Rico},
    editor = "Demberg, Vera  and
      Inui, Kentaro  and
      Marquez, Llu{\'i}s",
    booktitle = "Findings of the {A}ssociation for {C}omputational {L}inguistics: {EACL} 2026",
    month = mar,
    year = "2026",
    address = "Rabat, Morocco",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2026.findings-eacl.16/",
    pages = "290--306",
    ISBN = "979-8-89176-386-9"
}

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