unicode-org · conradarcturus · Nov 24, 2025
diff --git a/common/main/en.xml b/common/main/en.xml
@@ -291,6 +291,7 @@ annotations.
 			<language type="inh">Ingush</language>
 			<language type="io">Ido</language>
 			<language type="is">Icelandic</language>
+			<language type="isv">Interslavic</language>
 			<language type="it">Italian</language>
 			<language type="iu">Inuktitut</language>
 			<language type="izh">Ingrian</language>

diff --git a/common/main/isv.xml b/common/main/isv.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
+<!-- Copyright © 1991-2025 Unicode, Inc.
+For terms of use, see http://www.unicode.org/copyright.html
+SPDX-License-Identifier: Unicode-3.0
+CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
+-->
+<ldml>
+	<identity>
+		<version number="$Revision$"/>
+		<language type="isv"/>
+	</identity>
+	<localeDisplayNames>
+		<languages>
+			<language type="isv">Medžuslovjansky</language>
+		</languages>
+	</localeDisplayNames>
+    <characters>
+        <exemplarCharacters>[a b c č d {dž} e ě f g h i j k l {lj} m n {nj} o p r s š t u v y z ž]</exemplarCharacters>
+        <exemplarCharacters type="auxiliary">[å ć ď đ è ė ę ĺ ľ ń ň ò ȯ q ŕ ś ť ų w x ź]</exemplarCharacters>
+        <exemplarCharacters type="index">[A B C Č D {DŽ} E Ě F G H I J K L {LJ} M N {NJ} O P R S Š T U V Y Z Ž]</exemplarCharacters>
+        <exemplarCharacters type="numbers">[0 1 2 3 4 5 6 7 8 9]</exemplarCharacters>
+        <exemplarCharacters type="punctuation">[\- ‐ ‑ – — , ; \: ! ? . … ' ‚ ‘ ’ ‹ › &quot; „ “ ” « » ( ) \[ \] § @ * / \&amp; # † ‡ ′ ″]</exemplarCharacters>
+    </characters>
+</ldml>
diff --git a/common/main/isv_Cyrl.xml b/common/main/isv_Cyrl.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
+<!-- Copyright © 1991-2025 Unicode, Inc.
+For terms of use, see http://www.unicode.org/copyright.html
+SPDX-License-Identifier: Unicode-3.0
+CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
+-->
+<ldml>
+	<identity>
+		<version number="$Revision$"/>
+		<language type="isv"/>
+        <script type="Cyrl"/>
+	</identity>
+	<localeDisplayNames>
+		<languages>
+			<language type="isv">Меджусловјанскы</language>
+		</languages>
+	</localeDisplayNames>
+    <characters>
+        <exemplarCharacters>[а б в г д {дж} е є ж з и ы ј к л љ м н њ о п р с т у ф х ц ч ш]</exemplarCharacters>
+        <exemplarCharacters type="index">[А Б В Г Д {ДЖ} Е Є Ж З И Ы Ј К Л Љ М Н Њ О П Р С Т У Ф Х Ц Ч Ш]</exemplarCharacters>
+        <exemplarCharacters type="numbers">[0 1 2 3 4 5 6 7 8 9]</exemplarCharacters>
+		<exemplarCharacters type="punctuation">[\- ‐ ‑ – — , ; \: ! ? . … ' ‚ ‘ ’ ‹ › &quot; „ “ ” « » ( ) \[ \] § @ * / \&amp; # † ‡ ′ ″]</exemplarCharacters>
+    </characters>
+</ldml>
diff --git a/common/main/isv_Cyrl_001.xml b/common/main/isv_Cyrl_001.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
+<!-- Copyright © 1991-2025 Unicode, Inc.
+For terms of use, see http://www.unicode.org/copyright.html
+SPDX-License-Identifier: Unicode-3.0
+CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
+-->
+<ldml>
+	<identity>
+		<version number="$Revision$"/>
+		<language type="isv"/>
+        <script type="Cyrl"/>
+		<territory type="001"/>
+	</identity>
+</ldml>
diff --git a/common/main/isv_Latn.xml b/common/main/isv_Latn.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
+<!-- Copyright © 1991-2025 Unicode, Inc.
+For terms of use, see http://www.unicode.org/copyright.html
+SPDX-License-Identifier: Unicode-3.0
+CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
+-->
+<ldml>
+	<identity>
+		<version number="$Revision$"/>
+		<language type="isv"/>
+        <script type="Latn"/>
+	</identity>
+</ldml>
diff --git a/common/main/isv_Latn_001.xml b/common/main/isv_Latn_001.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
+<!-- Copyright © 1991-2025 Unicode, Inc.
+For terms of use, see http://www.unicode.org/copyright.html
+SPDX-License-Identifier: Unicode-3.0
+CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
+-->
+<ldml>
+	<identity>
+		<version number="$Revision$"/>
+		<language type="isv"/>
+        <script type="Latn"/>
+		<territory type="001"/>
+	</identity>
+</ldml>
diff --git a/common/supplemental/attributeValueValidity.xml b/common/supplemental/attributeValueValidity.xml
@@ -72,7 +72,7 @@
 				 ff frr fur
 				 gaa gez gn gsw guz gv
 				 haw hnj ht
-				 ii io iu
+				 ii io isv iu
 				 jbo jgo jmc
 				 kaa kab kaj kam kcg kde kek ken khq ki kkj kl kln kpe ksb ksf ksh kw
 				 la lag lg lkt lld ln lrc ltg lu luo luy lzz

diff --git a/common/supplemental/likelySubtags.xml b/common/supplemental/likelySubtags.xml
@@ -318,6 +318,7 @@ not be patched by hand, as any changes made in that fashion may be lost.
 		<likelySubtag from="inh" to="inh_Cyrl_RU"/>		<!--Ingush‧?‧?	➡ Ingush‧Cyrillic‧Russia-->
 		<likelySubtag from="io" to="io_Latn_001"/>		<!--Ido‧?‧?	➡ Ido‧Latin‧world-->
 		<likelySubtag from="is" to="is_Latn_IS"/>		<!--Icelandic‧?‧?	➡ Icelandic‧Latin‧Iceland-->
+		<likelySubtag from="isv" to="isv_Latn_001"/>		<!--Interslavic‧?‧?	➡ Interslavic‧Latin‧world-->
 		<likelySubtag from="it" to="it_Latn_IT"/>		<!--Italian‧?‧?	➡ Italian‧Latin‧Italy-->
 		<likelySubtag from="itz" to="itz_Latn_GT"/>		<!--Itzá‧?‧?	➡ Itzá‧Latin‧Guatemala-->
 		<likelySubtag from="iu" to="iu_Cans_CA"/>		<!--Inuktitut‧?‧?	➡ Inuktitut‧Unified Canadian Aboriginal Syllabics‧Canada-->

diff --git a/common/supplemental/supplementalData.xml b/common/supplemental/supplementalData.xml
@@ -1619,6 +1619,8 @@ XXX Code for transations where no currency is involved
 		<language type="inh" scripts="Arab Latn" alt="secondary"/>
 		<language type="io" scripts="Latn"/>
 		<language type="is" scripts="Latn"/>
+		<language type="isv" scripts="Latn"/>
+		<language type="isv" scripts="Cyrl" alt="secondary"/>
 		<language type="it" scripts="Latn"/>
 		<language type="iu" scripts="Cans Latn"/>
 		<language type="izh" scripts="Latn"/>

diff --git a/common/supplemental/supplementalMetadata.xml b/common/supplemental/supplementalMetadata.xml
@@ -1895,7 +1895,7 @@ For terms of use, see http://www.unicode.org/copyright.html
 			ga_IE gaa_GH gd_GB gez_ET gl_ES gn_PY gsw_CH gu_IN guz_KE gv_IM
 			ha_Arab_NG ha_NG haw_US he_IL hi_IN hi_Latn_IN hnj_Hmnp hnj_Hmnp_US hr_HR
 			hsb_DE ht_HT hu_HU hy_AM
-			ia_001 id_ID ie_EE ife_TG ig_NG ii_CN io_001 is_IS it_IT iu_CA iu_Latn_CA
+			ia_001 id_ID ie_EE ife_TG ig_NG ii_CN io_001 is_IS isv_Latn isv_Latn_001 isv_Cyrl_001 it_IT iu_CA iu_Latn_CA
 			ja_JP jbo_001 jgo_CM jmc_TZ jv_ID
 			ka_GE kaa_Cyrl kaa_Cyrl_UZ kaa_Latn_UZ kab_DZ kaj_NG kam_KE kcg_NG kde_TZ kea_CV kek_GT ken_CM kgp_BR
 			khq_ML ki_KE

diff --git a/tools/cldr-code/src/main/java/org/unicode/cldr/tool/GenerateLikelySubtags.java b/tools/cldr-code/src/main/java/org/unicode/cldr/tool/GenerateLikelySubtags.java
@@ -343,6 +343,9 @@ public static void main(String[] args) throws IOException {
                                 {"cic_Latn", "cic_Latn_US"},
                                 {"eo", "eo_Latn_001"},
                                 {"eo_Latn", "eo_Latn_001"},
+                                {"isv", "isv_Latn_001"},
+                                {"isv_Latn", "isv_Latn_001"},
+                                {"isv_Cyrl", "isv_Cyrl_001"},
                                 {"es", "es_Latn_ES"},
                                 {"es_Latn", "es_Latn_ES"},
                                 {"ff_BF", "ff_Latn_BF"},

diff --git a/...s/cldr-code/src/main/resources/org/unicode/cldr/util/data/country_language_population.tsv b/...s/cldr-code/src/main/resources/org/unicode/cldr/util/data/country_language_population.tsv
@@ -1549,6 +1549,8 @@ United States	US	"329,256,465"	99%	"19,490,000,000,000"		Ido	io	"100"
 Unknown Region	ZZ	0	0%	0		Ido	io	0	99%
 Unknown Region	ZZ	0	0%	0		Interlingua	ia	0	99%
 Unknown Region	ZZ	0	0%	0		Interlingue	ie	0	99%
+Unknown Region	ZZ	0	0%	0		Interslavic	isv_Latn	20000	99%		https://web.archive.org/web/20230524211611/https://mel.fm/zhizn/istorii/9084523-da-by-komunikovali-edin-s-drugym-chto-takoye-mezhslavyansky-yazyk-i-zachem-ego-pridumali
+Unknown Region	ZZ	0	0%	0		Interslavic	isv_Cyrl	20000	99%		https://web.archive.org/web/20230524211611/https://mel.fm/zhizn/istorii/9084523-da-by-komunikovali-edin-s-drugym-chto-takoye-mezhslavyansky-yazyk-i-zachem-ego-pridumali
 Unknown Region	ZZ	0	0%	0		Kotava	avk	0	99%
 Unknown Region	ZZ	0	0%	0		Lingua Franca Nova	lfn	0	99%		An artificial language.  See http://en.wikipedia.org/wiki/Lingua_Franca_Nova
 Unknown Region	ZZ	0	0%	0		Novial	nov	0	99%		An artificial language.  See http://en.wikipedia.org/wiki/Novial_language

diff --git a/tools/cldr-code/src/main/resources/org/unicode/cldr/util/data/language_script.tsv b/tools/cldr-code/src/main/resources/org/unicode/cldr/util/data/language_script.tsv
@@ -362,6 +362,8 @@ inh	Ingush	secondary	Arab	Arabic
 inh	Ingush	secondary	Latn	Latin
 io	Ido	primary	Latn	Latin
 is	Icelandic	primary	Latn	Latin
+isv	Interslavic	primary	Latn	Latin
+isv	Interslavic	secondary	Cyrl	Cyrillic
 it	Italian	primary	Latn	Latin
 iu	Inuktitut	primary	Cans	Unified Canadian Aboriginal Syllabics
 iu	Inuktitut	primary	Latn	Latin