libfolia

This is a C++ Library for working with the Format for Linguistic Annotation (FoLiA).
Go to the software website https://github.com/LanguageMachines/libfolia

Provided tools & services

folialint

FoLiA validation tool
Type
  • Command-line Application
Executable name
folialint

libfolia

FoLiA Library with API for C++
Type
  • Software Library
Executable name
libfolia

Tool suite: FoLiA

The following closely related tools are in a tool suite together with libfolia:

  • Command-line Application
  • 9 - Proven: Technology complete and proven in practice by real users.
  • Active: The project has reached a stable, usable state and is being actively developed.

FoLiA tools 2.5.9

  •   KNAW Humanities Cluster & CLST, Radboud University
FoLiA-tools contains various Python-based command line tools for working with FoLiA XML (Format for Linguistic Annotation) [view more]
  • Annotating
  • https://w3id.org/nwo-research-fields#ComputationalLinguisticsandPhilology
  • Textual and linguistic corpora
  • annotation
  • computational linguistics
  • folia
  • nlp
  • search
  • Bsd
  • Linux
  • Macos
  • Python
Created: 2011-01-14
Modified: 2025-05-08
  • Software Library
  • 9 - Proven: Technology complete and proven in practice by real users.
  • Active: The project has reached a stable, usable state and is being actively developed.

FoLiApy 2.5.12

  •   KNAW Humanities Cluster & CLST, Radboud University
An extensive library for processing FoLiA documents. FoLiA stands for Format for Linguistic Annotation and is a very rich XML-based format used by various Natural Language Processing tools. [view more]
  • Annotating
  • https://w3id.org/nwo-research-fields#ComputationalLinguisticsandPhilology
  • Textual and linguistic corpora
  • annotation
  • computational linguistics
  • folia
  • format
  • nlp
  • xml
  • Bsd
  • Linux
  • Macos
  • Python
Created: 2010-05-27
Modified: 2024-10-11
  • Software Library
  • Inactive: The project has reached a stable, usable state but is no longer being actively developed; support/maintenance will be provided as time allows.

folia 0.0.6

  •   KNAW Humanities Cluster & CLST, Radboud University
High-performance library for handling the FoLiA XML format (Format for Linguistic Annotation) [view more]
  • ['science', 'text-processing']
  • annotation
  • linguistics
  • nlp
  • text-processing
  • xml
Created: 2019-06-08
Modified: 2020-11-16
  • Command-line Application
  • Active: The project has reached a stable, usable state and is being actively developed.

foliautils 0.23

Command-line utilities for working with the Format for Linguistic Annotation (FoLiA). [view more]
  • folia
  • linguistic annotation
  • natural language processing
  • nlp
  • xml
  • Posix
  • Web Application
  • 8 - Complete: Technology complete and qualified, released for all end-users in scholarly environments.
  • Inactive: The project has reached a stable, usable state but is no longer being actively developed; support/maintenance will be provided as time allows.

piereling 0.4

  •   KNAW Humanities Cluster & CLST, Radboud University
Piereling is a webservice and web-application to convert between a variety of document formats, mostly from and to FoLiA XML. It is intended for NLP pipelines. [view more]
  • Internet > WWW/HTTP > WSGI > Application
  • Text Processing > Linguistic
  • webservice nlp computational_linguistics rest folia conversion
  • Bsd
  • Linux
  • Macos
  • Python
Created: 2019-10-18
Modified: 2023-11-01

References

Citation

Please use one of the above reference publications to cite the software, if you want to cite the software directly, you can use the following citation generated from the metadata:

libfolia 2.22 .
  • Centre for Language and Speech Technology
.

Logs & Reviews

Name
Automatic software metadata validation report for libfolia 2.22
Author
  • codemetapy validator using software.ttl
Date
2026-02-07 03:21:33
Review
Please consult the CLARIAH Software Metadata Requirements at https://github.com/CLARIAH/clariah-plus/blob/main/requirements/software-metadata-requirements.md for an in-depth explanation of any found problems

Validation of libfolia 2.22 was successful (score=3/5), but there are some warnings which should be addressed:

1. Warning: Documentation *SHOULD* be expressed (This is missing in the metadata)
2. Info: The funder *SHOULD* be acknowledged (This is missing in the metadata)
3. Info: The technology readiness level *SHOULD* be expressed (This is missing in the metadata)
Rating
★ ★ ★ ☆ ☆ 
(log file starts at Sat Feb  7 03:21:26 UTC 2026)

[harvester info] --> Processing libfolia (https://github.com/LanguageMachines/libfolia) [Sat Feb  7 03:21:26 UTC 2026]

[harvester info] Git updating cached clone of https://github.com/LanguageMachines/libfolia...

[harvester info] Found release v2.22

[harvester info] Using 'v2.22'

[harvester info] Git reference: v2.22

[harvester info] Scanning directory /tmp/codemeta-harvester.cache/libfolia for harvestable resources...

[harvester info] found codemeta.json for libfolia (md5sum b059b136d4a37d5e6d6101adcce65249); **NOTE: this is considered authoritative and most other detection methods will be skipped now!**

[harvester info] Inferring repostatus information from git activity (used only as a fallback if not explicitly provided)...

[harvester info] Inferred repostatus https://www.repostatus.org/#active

[harvester info] Looking for repostatus information in README.md in master branch...

[harvester info] Found repostatus (master branch) https://www.repostatus.org/#active

[harvester info] Looking for repostatus information in README in master branch...

[harvester info] Parsing MAINTAINERS from master branch...

[harvester info] Setting group FoLiA

[harvester info] Reconciliating: codemetapy  --baseuri https://tools.clariah.nl --baseuri https://tools.clariah.nl --includecontext --addcontext https://w3id.org/nwo-research-fields --addcontext https://w3id.org/research-technology-readiness-levels --addcontextgraph https://vocabs.dariah.eu/rest/v1/tadirah/data?format=text/turtle --trl --identifier "libfolia" --codeRepository "https://github.com/LanguageMachines/libfolia" --validate /etc/software.ttl --released --enrich --textv "Please consult the CLARIAH Software Metadata Requirements at https://github.com/CLARIAH/clariah-plus/blob/main/requirements/software-metadata-requirements.md for an in-depth explanation of any found problems" -O /tmp/out/libfolia.codemeta.json /tmp/codemeta-harvester.cache//tmp/99-repostatus.libfolia.codemeta.json /tmp/codemeta-harvester.cache//tmp/10-jsonld.libfolia.codemeta.json /tmp/codemeta-harvester.cache//tmp/05-repostatus.libfolia.codemeta.json /tmp/codemeta-harvester.cache//tmp/05-maintainers.libfolia.codemeta.json /tmp/codemeta-harvester.cache//tmp/04-applicationSuite.libfolia.codemeta.json 

-- begin log --

/usr/lib/python3.12/site-packages/pyshacl/extras/__init__.py:6: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.

  import pkg_resources

Passed 5 files/sources but specified 0 input types! Automatically guessing types...

Detected input types: [('/tmp/codemeta-harvester.cache//tmp/99-repostatus.libfolia.codemeta.json', 'json'), ('/tmp/codemeta-harvester.cache//tmp/10-jsonld.libfolia.codemeta.json', 'json'), ('/tmp/codemeta-harvester.cache//tmp/05-repostatus.libfolia.codemeta.json', 'json'), ('/tmp/codemeta-harvester.cache//tmp/05-maintainers.libfolia.codemeta.json', 'json'), ('/tmp/codemeta-harvester.cache//tmp/04-applicationSuite.libfolia.codemeta.json', 'json')]

Adding to contextgraph: /tmp/turtle

Initial URI automatically generated, may be overriden later: https://tools.clariah.nl/libfolia

Processing source #1 of 5

Parsing json-ld file from /tmp/codemeta-harvester.cache//tmp/99-repostatus.libfolia.codemeta.json

    NOTE: Not a valid JSON-LD document, @context missing! Attempting to inject automatically...

    Injected (possibly temporary) URI https://tools.clariah.nl/libfolia

[CODEMETA COMPOSITION (https://tools.clariah.nl/libfolia)] processed 1 new triples, total is now 2

Processing source #2 of 5

Parsing json-ld file from /tmp/codemeta-harvester.cache//tmp/10-jsonld.libfolia.codemeta.json

    Injected (possibly temporary) URI https://tools.clariah.nl/libfolia

[CODEMETA 2 TO 3] Updating contIntegration -> continuousIntegration

[CODEMETA 2 TO 3] Updating targetProduct -> isSourceCodeOf

[CODEMETA 2 TO 3] Updating targetProduct -> isSourceCodeOf

[CODEMETA CORRECTION (libfolia)] automatically converting spdx license URI from https:// to http:///

[CODEMETA COMPOSITION (libfolia)] processed 111 new triples, total is now 111

Processing source #3 of 5

Parsing json-ld file from /tmp/codemeta-harvester.cache//tmp/05-repostatus.libfolia.codemeta.json

    NOTE: Not a valid JSON-LD document, @context missing! Attempting to inject automatically...

    Injected (possibly temporary) URI https://tools.clariah.nl/libfolia

[CODEMETA COMPOSITION (libfolia)] processed 1 new triples, total is now 111

Processing source #4 of 5

Parsing json-ld file from /tmp/codemeta-harvester.cache//tmp/05-maintainers.libfolia.codemeta.json

    Found main resource with URI https://tools.clariah.nl/maintainers/snapshot

    Injected (possibly temporary) URI https://tools.clariah.nl/libfolia

[CODEMETA COMPOSITION (libfolia)] processed 14 new triples, total is now 124

Processing source #5 of 5

Parsing json-ld file from /tmp/codemeta-harvester.cache//tmp/04-applicationSuite.libfolia.codemeta.json

    NOTE: Not a valid JSON-LD document, @context missing! Attempting to inject automatically...

    Injected (possibly temporary) URI https://tools.clariah.nl/libfolia

[CODEMETA COMPOSITION (libfolia)] processed 1 new triples, total is now 125

Remapping URI to (possibly) new identifier and version component: https://tools.clariah.nl/libfolia -> https://tools.clariah.nl/libfolia/2.22

[CODEMETA VALIDATION (libfolia)] done

[CODEMETA ENRICHMENT (libfolia)] adding author https://tools.clariah.nl/stub/H-6f6800ced4ed412c as contributor

[CODEMETA ENRICHMENT (libfolia)] adding author https://orcid.org/0000-0002-1046-0006 as contributor

VALIDATION https://tools.clariah.nl/libfolia/2.22 #1: Warning: Documentation *SHOULD* be expressed (This is missing in the metadata)

VALIDATION https://tools.clariah.nl/libfolia/2.22 #2: Info: The funder *SHOULD* be acknowledged (This is missing in the metadata)

VALIDATION https://tools.clariah.nl/libfolia/2.22 #3: Info: The technology readiness level *SHOULD* be expressed (This is missing in the metadata)

-- end log --

[harvester info] Output written to /tmp/out/libfolia.codemeta.json

[harvester info] <-- Finished processing libfolia (https://github.com/LanguageMachines/libfolia) [Sat Feb  7 03:21:34 UTC 2026]

Metadata Properties

Version
2.22 (release notes)
Interface types
  • Command-line Application
  • Software Library
Software website
Source code repository
 https://github.com/LanguageMachines/libfolia Stars are an indicator of the popularity of this project on GitHub
Keywords
  • folia
  • linguistic annotation
  • natural language processing
  • nlp
  • xml
Development Status
  • Active: The project has reached a stable, usable state and is being actively developed.
Issue Tracker (Support)
https://github.com/LanguageMachines/libfolia/issues The number of open issues on the issue tracker The number of closes issues on the issue tracker
Documentation
License
Author(s)
Maintainer(s)
Contributor(s)
Producer
Programming Language
  • C++
Continuous Integration Tests
None
Operating System
  • POSIX
Software dependencies
  • icu
  • libxml2
  • ticcutils
Metadata validation
★ ★ ★ ☆ ☆