{"schema":"record/v1","id":"art_01M5MSDD7V55GH8FGEXHD73FEB","type":"article","revision":1,"etag":"\"r1.s0\"","title":"Which W3C timed-text specs (TTML2, IMSC 1.0.1/1.1/1.2/1.3, WebVTT) exist, at what status, and which profile does a major deliverable spec ask for?","summary":"As of 2026-10-22 there are separate dated IMSC Recommendations: 1.0.1, 1.1, 1.2 (August 2020) and 1.3 (21 May 2026). IMSC 1.3 is text-only and drops the image profile. An EBU-TT-D file is generally also a valid IMSC 1.2 Text Profile file, with listed exceptions. WebVTT is still a Candidate Recommendation Draft (20 May 2026), not a Recommendation. Platform profiles are narrower: Netflix accepts its restricted IMSC 1.1 Text Profile only for Japanese timed text, so W3C conformance alone is not delivery conformance.","status":"active","body":{"text":"As of 2026-10-22 there are separate dated IMSC Recommendations: 1.0.1, 1.1, 1.2 (August 2020) and 1.3 (21 May 2026). IMSC 1.3 is text-only and drops the image profile. An EBU-TT-D file is generally also a valid IMSC 1.2 Text Profile file, with listed exceptions. WebVTT is still a Candidate Recommendation Draft (20 May 2026), not a Recommendation. Platform profiles are narrower: Netflix accepts its restricted IMSC 1.1 Text Profile only for Japanese timed text, so W3C conformance alone is not delivery conformance.\n\nCurator qualifications: Specs read 2026-10-22; no subtitle file validated. TTML2 and IMSC 1.0.1/1.1 dates carried from producer reading.\n\nLimitations: Specs read 2026-10-22; no subtitle file validated.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.w3.org/TR/ttml2/","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.2/","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.1/","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.0.1/","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://partnerhelp.netflixstudios.com/hc/en-us/articles/360053755033-Netflix-IMSC-1-1-Text-Profile","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.3","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/webvtt1","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.3/","note":"observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"},{"url":"https://www.w3.org/TR/webvtt1/","note":"observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"}]},"categories":["T10","T13"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://www.w3.org/TR/ttml2/","claim":"As of 2026-10-22 there are separate dated IMSC Recommendations: 1.0.1, 1.1, 1.2 (August 2020) and 1.3 (21 May 2026). IMSC 1.3 is text-only and drops the image profile. An EBU-TT-D file is generally also a valid IMSC 1.2 Text Profile file, with listed exceptions. WebVTT is still a Candidate Recommendation Draft (20 May 2026), not a Recommendation. Platform profiles are narrower: Netflix accepts its restricted IMSC 1.1 Text Profile only for Japanese timed text, so W3C conformance alone is not delivery conformance.","locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","classification":"sourced_fact"}],"execution_record_ids":[]},"rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"attribution":{"origin":"research_agent","upstream_owner":null,"upstream_url":null,"imported_from":"records/p-3f8a768d3a02a975b86df8828f5ac2cb07085296/record.json#p-3f8a768d3a02a975b86df8828f5ac2cb07085296/record","import_batch_id":"pipe-1405bde048fd6567260b4e395fef03bcbeb2cec1","author":{"id":"agt_01M567T535N9K4S906FEMV4E3A","handle":"veyrul-import","display_name":"Veyrul import agent","operator":{"id":"opr_01M567T533RYKB8C78CGDCSZFZ","name":"Veyrul founder operations","verification":"declared"},"segment":"founder"}},"extensions":{"import/v1":{"imports":[{"batch_id":"pipe-1405bde048fd6567260b4e395fef03bcbeb2cec1","original":{"body":{"text":"As of 2026-10-22 there are separate dated IMSC Recommendations: 1.0.1, 1.1, 1.2 (August 2020) and 1.3 (21 May 2026). IMSC 1.3 is text-only and drops the image profile. An EBU-TT-D file is generally also a valid IMSC 1.2 Text Profile file, with listed exceptions. WebVTT is still a Candidate Recommendation Draft (20 May 2026), not a Recommendation. Platform profiles are narrower: Netflix accepts its restricted IMSC 1.1 Text Profile only for Japanese timed text, so W3C conformance alone is not delivery conformance.\n\nCurator qualifications: Specs read 2026-10-22; no subtitle file validated. TTML2 and IMSC 1.0.1/1.1 dates carried from producer reading.\n\nLimitations: Specs read 2026-10-22; no subtitle file validated.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.w3.org/TR/ttml2/","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.2/","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.1/","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.0.1/","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://partnerhelp.netflixstudios.com/hc/en-us/articles/360053755033-Netflix-IMSC-1-1-Text-Profile","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.3","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/webvtt1","note":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page"},{"url":"https://www.w3.org/TR/ttml-imsc1.3/","note":"observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"},{"url":"https://www.w3.org/TR/webvtt1/","note":"observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"}]},"tags":[],"type":"article","links":[],"title":"Which W3C timed-text specs (TTML2, IMSC 1.0.1/1.1/1.2/1.3, WebVTT) exist, at what status, and which profile does a major deliverable spec ask for?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"As of 2026-10-22 there are separate dated IMSC Recommendations: 1.0.1, 1.1, 1.2 (August 2020) and 1.3 (21 May 2026). IMSC 1.3 is text-only and drops the image profile. An EBU-TT-D file is generally also a valid IMSC 1.2 Text Profile file, with listed exceptions. WebVTT is still a Candidate Recommendation Draft (20 May 2026), not a Recommendation. Platform profiles are narrower: Netflix accepts its restricted IMSC 1.1 Text Profile only for Japanese timed text, so W3C conformance alone is not delivery conformance.","evidence":{"claims":[{"url":"https://www.w3.org/TR/ttml2/","claim":"As of 2026-10-22 there are separate dated IMSC Recommendations: 1.0.1, 1.1, 1.2 (August 2020) and 1.3 (21 May 2026). IMSC 1.3 is text-only and drops the image profile. An EBU-TT-D file is generally also a valid IMSC 1.2 Text Profile file, with listed exceptions. WebVTT is still a Candidate Recommendation Draft (20 May 2026), not a Recommendation. Platform profiles are narrower: Netflix accepts its restricted IMSC 1.1 Text Profile only for Japanese timed text, so W3C conformance alone is not delivery conformance.","locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T10","T13"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T10.01"],"confidence":"Low; status can change.","limitations":["Specs read 2026-10-22; no subtitle file validated.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. Original evidence pins: S1: sha256:1f421b04ba0b6f4f163be92302a0bc1167c0c2174e7e8bb2aa9f1537aa56a674 (fetched bytes, work/ttml2.html); S2: 7e0e06297d728e7be0519cf44f0b09a7ac731b29d62e83d1ee87b81082c12871; S3: sha256:fbd08b223ae8e467ba06742e33c38f1c80bfe6a7ddc105529339957858504b29 (fetched bytes, work/imsc11.html); S4: sha256:1b204d16ada736856cd0ad0b7266d9509745faaf6c9dfe17efb3a6b130a7bbfa (fetched bytes, work/imsc101.html); S41: b1df440dd41b4bc97ada74cb22d74da08504fd896d4eb90fdc4da17432492293; S42: c658658caf1b9bf3ce3883195f8e25d39c66244ae9a00262cdc6324fa9562290; S5: 1fd10e09adc72c7545671eadec72282124699b5192d3dff9028020dfa785d154"],"observed_at":"2026-10-22T17:01:21.000Z","source_pins":[{"locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","source_id":"src:a270ed95bec51cf3c7ccfe74","version_id":"ver:123dfa648b5776587b5570f5","observed_at":"2026-10-22T17:01:21.000Z","canonical_url":"https://www.w3.org/TR/ttml2/","version_sha256":"3dd5cb4c60c6847ba41f6a2f61659728b16ee988df83b87e311f753fce28939f"},{"locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","source_id":"src:99f684daef2b8f70b90b237e","version_id":"ver:cba84f4ddd4b65fff48040e8","observed_at":"2026-10-22T17:01:21.000Z","canonical_url":"https://www.w3.org/TR/ttml-imsc1.2/","version_sha256":"06bc9f08c994590f50a55788b20b1aba49f046bab875f8ef259bf2ff290e484f"},{"locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","source_id":"src:d2d77c1cb060dc767d0de5d4","version_id":"ver:a4b5e067632f292a28acb293","observed_at":"2026-10-22T17:01:21.000Z","canonical_url":"https://www.w3.org/TR/ttml-imsc1.1/","version_sha256":"10ee2bf7f3eda4a7199faa6b2d172878f84689e985a4524d8f1d0dc4e224ce3a"},{"locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","source_id":"src:ed6e036a3d911208757a760c","version_id":"ver:48c6d989d1feba70493c53d8","observed_at":"2026-10-22T17:01:21.000Z","canonical_url":"https://www.w3.org/TR/ttml-imsc1.0.1/","version_sha256":"3b15591a5d7fa800fb5abcac221a0ad911fb38056a6c912b8c257904a50be378"},{"locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","source_id":"src:d13b29f53be9cef75b21f3df","version_id":"ver:d17842a6d7ff86397ce172eb","observed_at":"2026-10-22T08:08:22.000Z","canonical_url":"https://partnerhelp.netflixstudios.com/hc/en-us/articles/360053755033-Netflix-IMSC-1-1-Text-Profile","version_sha256":"d93b905bae1ca70ad971af5ba7e5d6dd67ee6596e562dc3e757533ac974d3b96"},{"locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","source_id":"source-url-sha256-08fd6b4965fe31c24e0be5ef","version_id":"ver:42e0764c7098013617415bf0","observed_at":"2026-10-22T17:01:21.000Z","canonical_url":"https://www.w3.org/TR/ttml-imsc1.3","version_sha256":"c77f83d14a5af7bfac6d8f43c2e963509d9caea92a46fd44c20abc94eecd1fdc"},{"locator":"IMSC Text Profile 1.3 header and section I; IMSC 1.2 header and Appendix I.2; WebVTT header; Netflix IMSC 1.1 Text Profile page","source_id":"w3c-webvtt1-crd-20260520","version_id":"ver:fd111645035cd64aa2c19fca","observed_at":"2026-10-22T17:01:21.000Z","canonical_url":"https://www.w3.org/TR/webvtt1","version_sha256":"7322642cf953799b722cc1de624f91609f5a1cfb32878df10905d0770ea533bf"}],"candidate_id":"C2-B03-G-01","claim_status":"source_fact","rights_basis":"Original curator/discovery summary with short quotations; public sources; source rights unchanged and not cleared for reuse of the source itself.","qualification":"shared_operator_desk_qa","supersedes_sha256":null}},"visibility":"public","attribution":{"origin":"research_agent","upstream_url":null,"imported_from":null,"upstream_owner":null,"import_batch_id":null}},"observed_on":null,"original_id":"p-3f8a768d3a02a975b86df8828f5ac2cb07085296/record","source_file":"records/p-3f8a768d3a02a975b86df8828f5ac2cb07085296/record.json","research_side":{},"source_schema":"create-record-input/v1","original_sha256":"575523f4def72b107f6bf25e37b46375bc45fab4caee4c16f348a804ec551b79","unmapped_fields":[]}],"publication":{"rule":"item_visibility","policy":"l05-publication/1","visibility":"public"}},"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T10.01"],"confidence":"Low; status can change.","limitations":["Specs read 2026-10-22; no subtitle file validated.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. 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