Call For Papers

The 20th International Workshop on Treebanks and Linguistic Theories

The 20th International Workshop on Treebanks and Linguistic Theories (TLT) will bring together developers and users of linguistically annotated natural language corpora and take place during the week of March 21st-25th, 2022. The workshop will be part of SyntaxFest 2021 which will take place during the week of March 21st-25th, 2022, online and possibly also onsite in Sofia, Bulgaria – to be determined in February 2022. The proceedings will be published preemptively in December 2021.


TLT addresses all aspects of treebank design, development, and use. As “treebanks” we consider any pairing of natural language data (spoken, signed, or written) with annotations of linguistic structure at various levels of analysis, including e.g., morpho-phonology, syntax, semantics, and discourse. Annotations can take any form (including trees or general graphs), but they should be encoded in a way that enables computational processing. Types of papers we anticipate include reflections on the design of linguistic annotations, methodology studies, resource announcements or updates, annotation or conversion tool development, and reports on treebank usage.

Papers should describe original work; they should emphasize completed work rather than intended work, and should indicate clearly the state of completion of the reported results. Submissions will be judged on correctness, originality, technical strength, significance and relevance to the conference, and interest to the attendees.

We invite paper submissions in two distinct tracks:

  • regular papers on substantial, original, and unpublished research, including empirical evaluation results, where appropriate;
  • short papers on smaller, focused contributions, work in progress, negative results, surveys, or opinion pieces.

All papers accepted for presentation at the workshop will be included in the TLT 2021 proceedings volume, which will be part of the ACL Anthology.

Long papers may consist of up to 10 pages of content (excluding references). Short papers and demo papers may consist of up to 6 pages of content (excluding references).

All submissions should follow the one-column format and the style guidelines. We strongly recommend the use of the LaTeX style files, OpenDocument, or Microsoft Word templates created for SyntaxFest (

Submissions will be reviewed double-blind. All regular and short papers must be anonymous, i.e. not reveal author(s) on the title page or through self-references. So e.g., “We previously showed (Smith, 2020) …”, should be avoided. Instead, use citations such as “Smith (2020) previously showed …”. Demonstration papers need not be anonymous. Papers must be submitted digitally, in PDF, and uploaded through the on-line conference system (

Submissions that violate either of these requirements will be returned without review.