Add ISO-690:2021 (numeric, brackets, English)

[MahZadYar]

Added a new independent style variant for ISO 690:2021 in English with numeric citations in square brackets.
This style is derived from the existing ISO 690 numeric English style and includes explicit metadata and behavior for the bracketed numeric variant.

Key updates included:

• New variant identity in title, file slug, ID and self link
• Template lineage link to ISO 690 numeric English style
• ISO 690:2021-focused formatting updates across references
• DOI precedence over URL for access location
• Improved online source handling including viewed date placement
• Expanded handling for modern digital resources (software, datasets, version, license, archived copy)
• Locale term adjustments and robust fallback behavior for missing metadata

Validation:
Style validates with no schema errors

Checklist:

• Added template link
• Added documentation link
• Added author metadata
• Used terms/labels where appropriate
• Kept line 1 unchanged

[github-actions]

Awesome! You just created a pull request to the Citation Styles Language styles repository. One of our human volunteers will try to get in touch soon (usually within a week). In the meantime, I will run some automated checks. You should be notified of the results in a few minutes.

If you haven't done so yet, please make sure your style validates and follows all our other Style Requirements.

To update this pull request, visit the "Files changed" tab above, click on the ellipsis button in the top-right corner of your style, and then select "Edit file" to start editing:

If you have any questions, please leave a comment and we'll get back to you. While we usually respond in English, feel free to write in whatever language you're most comfortable.

[github-actions]

😃 Your submission passed all our automated tests.

Below are some sample citations generated based on your proposed changes:

iso690-2021-numeric-brackets-en.csl (new)

[2, 4]
[1, 5]
[3]

---

[1]HANCKÉ, B.; M. RHODES and M. THATCHER Eds. Beyond varieties of capitalism: conflict, contradictions, and complementarities in the European economy [online]. Oxford: Oxford University Press, 2007. 438 pp. ISBN 978-0-19-920648-3 978-0-19-170971-5 Available from: https://doi.org/10.1093/acprof:oso/9780199206483.001.0001. [viewed 2025-10-19].
[2][Anon.]. CSL search by example. In: [Anon.] Citation style editor [online]. [place not known]: Citation Style Language, 2012. Available from: https://editor.citationstyles.org/searchByExample/. [viewed 2012-12-15].
[3]MARES, I. Firms and the welfare state: when, why, and how does social policy matter to employers? In: HALL, P.A. and D. SOSKICE Eds. Varieties of capitalism: the institutional foundations of comparative advantage [online]. Oxford: Oxford University Press, 2001. pp. 184–212. ISBN 978-0-19-924775-2 978-0-19-159634-6Available from: https://doi.org/10.1093/0199247757.003.0005. [viewed 2026-01-07].
[4]FENNER, M.; M. CROSAS; J.S. GRETHE; D. KENNEDY; H. HERMJAKOB et al. A data citation roadmap for scholarly data repositories. In: [Anon.] Scientific Data [online]. 2019. vol. 6. License: Creative Commons Attribution. Available from: https://doi.org/10.1038/s41597-019-0031-8. [viewed 2025-03-31].
[5]GALINDO-CASTAÑEDA, T.; E. KOST; E. GIULIANO; R.F. CONZ; J. SIX et al. Locating the microbes along the maize root system under nitrogen limitation: a root phenotypic approach. In: SCHNEIDER, H.M. and D. VETTERLEIN Eds. Annals of Botany [online]. 2025. vol. 136, no. 5–6, pp. 1143–1162. License: Creative Commons Attribution. Available from: https://doi.org/10.1093/aob/mcaf185. [viewed 2026-01-17].

[Copilot]

Pull request overview

Adds a new independent CSL style implementing ISO 690:2021 (English) with numeric citations in square brackets, derived from the existing ISO 690 numeric English style.

Changes:

• Introduces new style identity/metadata (title, ID, self link) and template lineage to iso690-numeric-en.
• Implements ISO 690:2021-oriented reference formatting (online handling, DOI-over-URL availability, viewed date placement).
• Expands formatting support for modern digital resources (datasets/software/version/license/archived copy).

---

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[github-actions]

😟 There are some issues with your submission.

1 test failed

iso690-2021-numeric-brackets-en: must validate against the CSL 1.0.1 schema
Please check your style at http://validator.citationstyles.org/

expected `[[9, "9:0: ERROR: Element link failed to validate attributes"], [0, "ERROR: Extra element link in int...Did not expect element locale there"], [21, "21:0: ERROR: Element style has extra content: locale"]].empty?` to be truthy, got false

Please check the test report for details.

[github-actions]

😟 There are some issues with your submission.

1 test failed

iso690-2021-numeric-brackets-en: must validate against the CSL 1.0.1 schema
Please check your style at http://validator.citationstyles.org/

expected `[[9, "9:0: ERROR: Element link failed to validate attributes"], [0, "ERROR: Extra element link in int...Did not expect element locale there"], [21, "21:0: ERROR: Element style has extra content: locale"]].empty?` to be truthy, got false

Please check the test report for details.

[github-actions]

😟 There are some issues with your submission.

1 test failed

iso690-2021-numeric-brackets-en: must validate against the CSL 1.0.1 schema
Please check your style at http://validator.citationstyles.org/

expected `[[9, "9:0: ERROR: Element link failed to validate attributes"], [0, "ERROR: Extra element link in int...Did not expect element locale there"], [21, "21:0: ERROR: Element style has extra content: locale"]].empty?` to be truthy, got false

Please check the test report for details.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 3 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[github-actions]

😃 Your submission passed all our automated tests.

Below are some sample citations generated based on your proposed changes:

iso690-2021-numeric-brackets-en.csl (new)

[2, 4]
[1, 5]
[3]

---

[1]HANCKÉ, B.; M. RHODES and M. THATCHER Eds. Beyond varieties of capitalism: conflict, contradictions, and complementarities in the European economy [online]. Oxford: Oxford University Press, 2007. 438 pp. ISBN 978-0-19-920648-3 978-0-19-170971-5 Available from: https://doi.org/10.1093/acprof:oso/9780199206483.001.0001. [viewed 2025-10-19].
[2][Anon.]. CSL search by example. In: [Anon.] Citation style editor [online]. [place not known]: Citation Style Language, 2012. Available from: https://editor.citationstyles.org/searchByExample/. [viewed 2012-12-15].
[3]MARES, I. Firms and the welfare state: when, why, and how does social policy matter to employers? In: HALL, P.A. and D. SOSKICE Eds. Varieties of capitalism: the institutional foundations of comparative advantage [online]. Oxford: Oxford University Press, 2001. pp. 184–212. ISBN 978-0-19-924775-2 978-0-19-159634-6 Available from: https://doi.org/10.1093/0199247757.003.0005. [viewed 2026-01-07].
[4]FENNER, M.; M. CROSAS; J.S. GRETHE; D. KENNEDY; H. HERMJAKOB et al. A data citation roadmap for scholarly data repositories. In: [Anon.] Scientific Data [online]. 2019. vol. 6. License: Creative Commons Attribution. Available from: https://doi.org/10.1038/s41597-019-0031-8. [viewed 2025-03-31].
[5]GALINDO-CASTAÑEDA, T.; E. KOST; E. GIULIANO; R.F. CONZ; J. SIX et al. Locating the microbes along the maize root system under nitrogen limitation: a root phenotypic approach. In: SCHNEIDER, H.M. and D. VETTERLEIN Eds. Annals of Botany [online]. 2025. vol. 136, no. 5–6, pp. 1143–1162. License: Creative Commons Attribution. Available from: https://doi.org/10.1093/aob/mcaf185. [viewed 2026-01-17].

[github-actions]

😃 Your submission passed all our automated tests.

Below are some sample citations generated based on your proposed changes:

iso690-2021-numeric-brackets-en.csl (new)

[2, 4]
[1, 5]
[3]

---

[1]HANCKÉ, B.; M. RHODES and M. THATCHER Eds. Beyond varieties of capitalism: conflict, contradictions, and complementarities in the European economy [online]. Oxford: Oxford University Press, 2007. 438 pp. ISBN 978-0-19-920648-3 978-0-19-170971-5 Available from: https://doi.org/10.1093/acprof:oso/9780199206483.001.0001. [viewed 2025-10-19].
[2][Anon.]. CSL search by example. In: [Anon.] Citation style editor [online]. [place not known]: Citation Style Language, 2012. Available from: https://editor.citationstyles.org/searchByExample/. [viewed 2012-12-15].
[3]MARES, I. Firms and the welfare state: when, why, and how does social policy matter to employers? In: HALL, P.A. and D. SOSKICE Eds. Varieties of capitalism: the institutional foundations of comparative advantage [online]. Oxford: Oxford University Press, 2001. pp. 184–212. ISBN 978-0-19-924775-2 978-0-19-159634-6 Available from: https://doi.org/10.1093/0199247757.003.0005. [viewed 2026-01-07].
[4]FENNER, M.; M. CROSAS; J.S. GRETHE; D. KENNEDY; H. HERMJAKOB et al. A data citation roadmap for scholarly data repositories. In: [Anon.] Scientific Data [online]. 2019. vol. 6. License: Creative Commons Attribution. Available from: https://doi.org/10.1038/s41597-019-0031-8. [viewed 2025-03-31].
[5]GALINDO-CASTAÑEDA, T.; E. KOST; E. GIULIANO; R.F. CONZ; J. SIX et al. Locating the microbes along the maize root system under nitrogen limitation: a root phenotypic approach. In: SCHNEIDER, H.M. and D. VETTERLEIN Eds. Annals of Botany [online]. 2025. vol. 136, no. 5–6, pp. 1143–1162. License: Creative Commons Attribution. Available from: https://doi.org/10.1093/aob/mcaf185. [viewed 2026-01-17].

[github-actions]

😃 Your submission passed all our automated tests.

Below are some sample citations generated based on your proposed changes:

iso690-2021-numeric-brackets-en.csl (new)

[2, 4]
[1, 5]
[3]

---

[1]HANCKÉ, B.; M. RHODES and M. THATCHER Eds. Beyond varieties of capitalism: conflict, contradictions, and complementarities in the European economy [online]. Oxford: Oxford University Press, 2007. 438 pp. ISBN 978-0-19-920648-3 978-0-19-170971-5 Available from: https://doi.org/10.1093/acprof:oso/9780199206483.001.0001. [viewed 2025-10-19].
[2][Anon.]. CSL search by example. In: [Anon.] Citation style editor [online]. [place not known]: Citation Style Language, 2012. Available from: https://editor.citationstyles.org/searchByExample/. [viewed 2012-12-15].
[3]MARES, I. Firms and the welfare state: when, why, and how does social policy matter to employers? In: HALL, P.A. and D. SOSKICE Eds. Varieties of capitalism: the institutional foundations of comparative advantage [online]. Oxford: Oxford University Press, 2001. pp. 184–212. ISBN 978-0-19-924775-2 978-0-19-159634-6 Available from: https://doi.org/10.1093/0199247757.003.0005. [viewed 2026-01-07].
[4]FENNER, M.; M. CROSAS; J.S. GRETHE; D. KENNEDY; H. HERMJAKOB et al. A data citation roadmap for scholarly data repositories. In: [Anon.] Scientific Data [online]. 2019. vol. 6. License: Creative Commons Attribution. Available from: https://doi.org/10.1038/s41597-019-0031-8. [viewed 2025-03-31].
[5]GALINDO-CASTAÑEDA, T.; E. KOST; E. GIULIANO; R.F. CONZ; J. SIX et al. Locating the microbes along the maize root system under nitrogen limitation: a root phenotypic approach. In: SCHNEIDER, H.M. and D. VETTERLEIN Eds. Annals of Botany [online]. 2025. vol. 136, no. 5–6, pp. 1143–1162. License: Creative Commons Attribution. Available from: https://doi.org/10.1093/aob/mcaf185. [viewed 2026-01-17].