Split nip30303 compound metadata tags into per-field tags

The artifact/dialect/chapter/translation-version events packed several
independent attributes into single positional tags
(["artifact", url, visibility, license], ["dialect", name, country,
language], etc.). Positional packing made every field mandatory (a
missing or malformed field nulled the whole metadata blob), blocked
extension, and forced ArtifactMetadataTag and
TranslationArtifactVersionMetadataTag to share TAG_NAME "artifact" with
field 1 meaning url vs name.

Replace the four compound tags with seven shared single-field tags
(NameTag, UrlTag, VisibilityTag, LicenseTag, CountryTag, LanguageTag,
OriginalTextTag), following the NIP-23 one-tag-per-field convention.
Event accessors now read each field independently and build()/toXEvent()
emit one tag per field; from...Event() readers let-chain the per-field
accessors. This also removes the duplicate "artifact" tag-name collision.

Note: breaking wire-format change for kinds 30300/30302/30304/30306;
safe now since these events are not published yet.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

composeApp/src/commonMain/kotlin/press/mantra/compose/database/model/MantraArtifact.kt

@@ -11,8 +11,10 @@ import com.vitorpamplona.quartz.nip31Alts.AltTag
 import press.mantra.compose.database.model.traits.OptionalNostrEventEntity
 import press.mantra.compose.database.model.traits.TimestampedEntity
 import press.mantra.compose.nostr.nip30303.ArtifactEvent
-import press.mantra.compose.nostr.nip30303.tags.ArtifactMetadataTag
 import press.mantra.compose.nostr.nip30303.tags.DialectIdTag
+import press.mantra.compose.nostr.nip30303.tags.LicenseTag
+import press.mantra.compose.nostr.nip30303.tags.UrlTag
+import press.mantra.compose.nostr.nip30303.tags.VisibilityTag
 import kotlin.time.Clock
 import kotlin.time.Instant
 
@@ -69,13 +71,9 @@ data class MantraArtifact(
             pubKey = publicKey,
             createdAt = createdAt.epochSeconds,
             tags = TagArrayBuilder<ArtifactEvent>()
-                .addUnique(
+                .addUnique(UrlTag.assemble(url))
-                    ArtifactMetadataTag.assemble(
+                .addUnique(VisibilityTag.assemble(visibility))
-                        url = url,
+                .addUnique(LicenseTag.assemble(license))
-                        visibility = visibility,
-                        license = license
-                    )
-                )
                 .addUnique(
                     DialectIdTag.assemble(dialectId)
                 )
@@ -109,20 +107,24 @@ data class MantraArtifact(
             )
         }
         fun fromArtifactEvent(artifactEvent: ArtifactEvent, chatRoomId: HexKey, ): MantraArtifact? {
-            return artifactEvent.artifactMetadata?.let { artifactMetadata ->
+            return artifactEvent.url()?.let { url ->
-                artifactEvent.dialectId()?.let { dialectId ->
+                artifactEvent.visibility()?.let { visibility ->
-                    MantraArtifact(
+                    artifactEvent.license()?.let { license ->
-                        id = artifactEvent.id,
+                        artifactEvent.dialectId()?.let { dialectId ->
-                        publicKey = artifactEvent.pubKey,
+                            MantraArtifact(
-                        dialectId = dialectId,
+                                id = artifactEvent.id,
-                        createdAt = Instant.fromEpochSeconds(artifactEvent.createdAt),
+                                publicKey = artifactEvent.pubKey,
-                        url = artifactMetadata.url,
+                                dialectId = dialectId,
-                        license = artifactMetadata.license,
+                                createdAt = Instant.fromEpochSeconds(artifactEvent.createdAt),
-                        visibility = artifactMetadata.visibility,
+                                url = url,
-                        name = artifactEvent.content,
+                                license = license,
-                        signature = artifactEvent.sig,
+                                visibility = visibility,
-                        chatRoomId = chatRoomId
+                                name = artifactEvent.content,
-                    )
+                                signature = artifactEvent.sig,
+                                chatRoomId = chatRoomId
+                            )
+                        }
+                    }
                 }
             }
         }

composeApp/src/commonMain/kotlin/press/mantra/compose/database/model/MantraChapter.kt

@@ -10,8 +10,9 @@ import press.mantra.compose.database.model.traits.TimestampedEntity
 import press.mantra.compose.nostr.nip30303.ArtifactVersionEvent
 import press.mantra.compose.nostr.nip30303.ChapterEvent
 import press.mantra.compose.nostr.nip30303.tags.ArtifactVersionIdTag
-import press.mantra.compose.nostr.nip30303.tags.ChapterMetadataTag
 import press.mantra.compose.nostr.nip30303.tags.IndexTag
+import press.mantra.compose.nostr.nip30303.tags.NameTag
+import press.mantra.compose.nostr.nip30303.tags.OriginalTextTag
 import press.mantra.compose.nostr.nip30303.tags.WordStatisticsTag
 import kotlin.time.Clock
 import kotlin.time.Instant
@@ -74,12 +75,8 @@ data class MantraChapter(
                 .addUnique(
                     ArtifactVersionIdTag.assemble(artifactVersionId)
                 )
-                .addUnique(
+                .addUnique(NameTag.assemble(name))
-                    ChapterMetadataTag.assemble(
+                .addUnique(OriginalTextTag.assemble(originalText))
-                        name = name,
-                        originalText = originalText,
-                    )
-                )
                 .addUnique(
                     IndexTag.assemble(
                         index
@@ -96,23 +93,25 @@ data class MantraChapter(
 
     companion object {
         fun fromChapterEvent(chapterEvent: ChapterEvent, chatRoomId: HexKey): MantraChapter? {
-            return chapterEvent.chapterMetadata?.let { chapterMetadata ->
+            return chapterEvent.name()?.let { name ->
-                chapterEvent.wordStatisticsTag?.let { wordStatisticsTag ->
+                chapterEvent.originalText()?.let { originalText ->
-                    chapterEvent.artifactVersionId()?.let { artifactId ->
+                    chapterEvent.wordStatisticsTag?.let { wordStatisticsTag ->
-                        chapterEvent.index()?.let { index ->
+                        chapterEvent.artifactVersionId()?.let { artifactId ->
-                            MantraChapter(
+                            chapterEvent.index()?.let { index ->
-                                id = chapterEvent.id,
+                                MantraChapter(
-                                publicKey = chapterEvent.pubKey,
+                                    id = chapterEvent.id,
-                                createdAt = Instant.fromEpochSeconds(chapterEvent.createdAt),
+                                    publicKey = chapterEvent.pubKey,
-                                artifactVersionId = artifactId,
+                                    createdAt = Instant.fromEpochSeconds(chapterEvent.createdAt),
-                                name = chapterMetadata.name,
+                                    artifactVersionId = artifactId,
-                                originalText = chapterMetadata.originalText,
+                                    name = name,
-                                index = index,
+                                    originalText = originalText,
-                                wordCount = wordStatisticsTag.wordCount,
+                                    index = index,
-                                characterCount = wordStatisticsTag.characterCount,
+                                    wordCount = wordStatisticsTag.wordCount,
-                                signature = chapterEvent.sig,
+                                    characterCount = wordStatisticsTag.characterCount,
-                                chatRoomId = chatRoomId
+                                    signature = chapterEvent.sig,
-                            )
+                                    chatRoomId = chatRoomId
+                                )
+                            }
                         }
                     }
                 }

composeApp/src/commonMain/kotlin/press/mantra/compose/database/model/MantraDialect.kt

@@ -10,7 +10,9 @@ import press.mantra.compose.database.model.traits.TimestampedEntity
 import press.mantra.compose.nostr.nip30303.ChunkEvent
 import press.mantra.compose.nostr.nip30303.DialectEvent
 import press.mantra.compose.nostr.nip30303.tags.ChapterIdTag
-import press.mantra.compose.nostr.nip30303.tags.DialectMetadataTag
+import press.mantra.compose.nostr.nip30303.tags.CountryTag
+import press.mantra.compose.nostr.nip30303.tags.LanguageTag
+import press.mantra.compose.nostr.nip30303.tags.NameTag
 import kotlin.time.Clock
 import kotlin.time.Instant
 
@@ -56,13 +58,9 @@ data class MantraDialect(
             pubKey = publicKey,
             createdAt = createdAt.epochSeconds,
             tags = TagArrayBuilder<ChunkEvent>()
-                .addUnique(
+                .addUnique(NameTag.assemble(name))
-                    DialectMetadataTag.assemble(
+                .addUnique(CountryTag.assemble(country))
-                        name = name,
+                .addUnique(LanguageTag.assemble(language))
-                        country = country,
-                        language = language
-                    )
-                )
                 .build(),
             content = language, // TODO: Consider using the isoCode... as content?
             sig = signature

composeApp/src/commonMain/kotlin/press/mantra/compose/database/model/MantraTranslationArtifactVersion.kt

@@ -11,7 +11,9 @@ import press.mantra.compose.nostr.nip30303.ArtifactVersionEvent
 import press.mantra.compose.nostr.nip30303.TranslationArtifactVersionEvent
 import press.mantra.compose.nostr.nip30303.tags.ArtifactVersionIdTag
 import press.mantra.compose.nostr.nip30303.tags.DialectIdTag
-import press.mantra.compose.nostr.nip30303.tags.TranslationArtifactVersionMetadataTag
+import press.mantra.compose.nostr.nip30303.tags.LicenseTag
+import press.mantra.compose.nostr.nip30303.tags.NameTag
+import press.mantra.compose.nostr.nip30303.tags.VisibilityTag
 import kotlin.time.Clock
 import kotlin.time.Instant
 
@@ -80,13 +82,9 @@ data class MantraTranslationArtifactVersion(
                 .addUnique(
                     DialectIdTag.assemble(dialectId)
                 )
-                .addUnique(
+                .addUnique(NameTag.assemble(name))
-                    TranslationArtifactVersionMetadataTag.assemble(
+                .addUnique(VisibilityTag.assemble(visibility))
-                        name = name,
+                .addUnique(LicenseTag.assemble(license))
-                        visibility = visibility,
-                        license = license
-                    )
-                )
                 .build(),
             content = "",
             sig = signature
@@ -98,19 +96,23 @@ data class MantraTranslationArtifactVersion(
 
             return translationArtifactVersionEvent.artifactVersionId()?.let { artifactVersionId ->
                 translationArtifactVersionEvent.dialectId()?.let { dialectId ->
-                    translationArtifactVersionEvent.translationArtifactVersionMetadata?.let { translationArtifactVersionMetadata ->
+                    translationArtifactVersionEvent.name()?.let { name ->
-                        MantraTranslationArtifactVersion(
+                        translationArtifactVersionEvent.visibility()?.let { visibility ->
-                            id = translationArtifactVersionEvent.id,
+                            translationArtifactVersionEvent.license()?.let { license ->
-                            publicKey = translationArtifactVersionEvent.pubKey,
+                                MantraTranslationArtifactVersion(
-                            createdAt = Instant.fromEpochSeconds(translationArtifactVersionEvent.createdAt),
+                                    id = translationArtifactVersionEvent.id,
-                            artifactVersionId = artifactVersionId,
+                                    publicKey = translationArtifactVersionEvent.pubKey,
-                            dialectId = dialectId,
+                                    createdAt = Instant.fromEpochSeconds(translationArtifactVersionEvent.createdAt),
-                            name = translationArtifactVersionMetadata.name,
+                                    artifactVersionId = artifactVersionId,
-                            visibility = translationArtifactVersionMetadata.visibility,
+                                    dialectId = dialectId,
-                            license = translationArtifactVersionMetadata.license,
+                                    name = name,
-                            signature = translationArtifactVersionEvent.sig,
+                                    visibility = visibility,
-                            chatRoomId = chatRoomId
+                                    license = license,
-                        )
+                                    signature = translationArtifactVersionEvent.sig,
+                                    chatRoomId = chatRoomId
+                                )
+                            }
+                        }
                     }
                 }
             }

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/ArtifactEvent.kt

@@ -9,8 +9,10 @@ import com.vitorpamplona.quartz.nip22Comments.RootScope
 import com.vitorpamplona.quartz.nip31Alts.alt
 import com.vitorpamplona.quartz.nip50Search.SearchableEvent
 import com.vitorpamplona.quartz.utils.TimeUtils
-import press.mantra.compose.nostr.nip30303.tags.ArtifactMetadataTag
 import press.mantra.compose.nostr.nip30303.tags.DialectIdTag
+import press.mantra.compose.nostr.nip30303.tags.LicenseTag
+import press.mantra.compose.nostr.nip30303.tags.UrlTag
+import press.mantra.compose.nostr.nip30303.tags.VisibilityTag
 
 
 @Immutable
@@ -22,11 +24,9 @@ class ArtifactEvent(
     content: String,
     sig: HexKey,
 ) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
-    val artifactMetadata = tags.firstNotNullOfOrNull(ArtifactMetadataTag::parse)
+    fun url() = tags.firstNotNullOfOrNull(UrlTag::parse)?.url
-
+    fun visibility() = tags.firstNotNullOfOrNull(VisibilityTag::parse)?.visibility
-    fun url() = artifactMetadata?.url
+    fun license() = tags.firstNotNullOfOrNull(LicenseTag::parse)?.license
-    fun visibility() = artifactMetadata?.visibility
-    fun license() = artifactMetadata?.license
 
     fun dialectIdReference() = tags.firstNotNullOfOrNull(DialectIdTag::parse)?.ref
     fun dialectId() = dialectIdReference()?.eventId
@@ -45,13 +45,9 @@ class ArtifactEvent(
             initializer: TagArrayBuilder<ArtifactEvent>.() -> Unit = {},
         ) = eventTemplate(KIND, name, createdAt) {
             alt(ALT_DESCRIPTION)
-            addUnique(
+            addUnique(UrlTag.assemble(url))
-                ArtifactMetadataTag.assemble(
+            addUnique(VisibilityTag.assemble(visibility))
-                    url = url,
+            addUnique(LicenseTag.assemble(license))
-                    visibility = visibility,
-                    license = license
-                )
-            )
             addUnique(
                 DialectIdTag.assemble(dialectId)
             )

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/ChapterEvent.kt

@@ -8,8 +8,9 @@ import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
 import com.vitorpamplona.quartz.nip31Alts.alt
 import com.vitorpamplona.quartz.utils.TimeUtils
 import press.mantra.compose.nostr.nip30303.tags.ArtifactVersionIdTag
-import press.mantra.compose.nostr.nip30303.tags.ChapterMetadataTag
 import press.mantra.compose.nostr.nip30303.tags.IndexTag
+import press.mantra.compose.nostr.nip30303.tags.NameTag
+import press.mantra.compose.nostr.nip30303.tags.OriginalTextTag
 import press.mantra.compose.nostr.nip30303.tags.WordStatisticsTag
 
 
@@ -22,14 +23,13 @@ class ChapterEvent(
     content: String,
     sig: HexKey,
 ) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
-    val chapterMetadata = tags.firstNotNullOfOrNull(ChapterMetadataTag::parse)
     val wordStatisticsTag = tags.firstNotNullOfOrNull(WordStatisticsTag::parse)
 
     fun artifactVersionIdReference() = tags.firstNotNullOfOrNull(ArtifactVersionIdTag::parse)?.ref
     fun artifactVersionId() = artifactVersionIdReference()?.eventId
 
-    fun name() = chapterMetadata?.name
+    fun name() = tags.firstNotNullOfOrNull(NameTag::parse)?.name
-    fun originalText() = chapterMetadata?.originalText
+    fun originalText() = tags.firstNotNullOfOrNull(OriginalTextTag::parse)?.originalText
 
     fun index() = tags.firstNotNullOfOrNull(IndexTag::parse)?.index
     fun wordCount() = wordStatisticsTag?.wordCount

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/DialectEvent.kt

@@ -9,7 +9,9 @@ import com.vitorpamplona.quartz.nip22Comments.RootScope
 import com.vitorpamplona.quartz.nip31Alts.alt
 import com.vitorpamplona.quartz.nip50Search.SearchableEvent
 import com.vitorpamplona.quartz.utils.TimeUtils
-import press.mantra.compose.nostr.nip30303.tags.DialectMetadataTag
+import press.mantra.compose.nostr.nip30303.tags.CountryTag
+import press.mantra.compose.nostr.nip30303.tags.LanguageTag
+import press.mantra.compose.nostr.nip30303.tags.NameTag
 
 
 @Immutable
@@ -21,11 +23,9 @@ class DialectEvent(
     content: String,
     sig: HexKey,
 ) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
-    val dialectMetadata = tags.firstNotNullOfOrNull(DialectMetadataTag::parse)
+    fun name() = tags.firstNotNullOfOrNull(NameTag::parse)?.name
-
+    fun country() = tags.firstNotNullOfOrNull(CountryTag::parse)?.country
-    fun name() = dialectMetadata?.name
+    fun language() = tags.firstNotNullOfOrNull(LanguageTag::parse)?.language
-    fun country() = dialectMetadata?.country
-    fun language() = dialectMetadata?.language
 
     companion object {
         const val KIND = 30304

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/TranslationArtifactVersionEvent.kt

@@ -9,7 +9,9 @@ import com.vitorpamplona.quartz.nip31Alts.alt
 import com.vitorpamplona.quartz.utils.TimeUtils
 import press.mantra.compose.nostr.nip30303.tags.ArtifactVersionIdTag
 import press.mantra.compose.nostr.nip30303.tags.DialectIdTag
-import press.mantra.compose.nostr.nip30303.tags.TranslationArtifactVersionMetadataTag
+import press.mantra.compose.nostr.nip30303.tags.LicenseTag
+import press.mantra.compose.nostr.nip30303.tags.NameTag
+import press.mantra.compose.nostr.nip30303.tags.VisibilityTag
 
 
 @Immutable
@@ -22,7 +24,9 @@ class TranslationArtifactVersionEvent(
     sig: HexKey,
 ) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
 
-    val translationArtifactVersionMetadata = tags.firstNotNullOfOrNull(TranslationArtifactVersionMetadataTag::parse)
+    fun name() = tags.firstNotNullOfOrNull(NameTag::parse)?.name
+    fun visibility() = tags.firstNotNullOfOrNull(VisibilityTag::parse)?.visibility
+    fun license() = tags.firstNotNullOfOrNull(LicenseTag::parse)?.license
 
     fun artifactVersionIdReference() = tags.firstNotNullOfOrNull(ArtifactVersionIdTag::parse)?.ref
     fun artifactVersionId() = artifactVersionIdReference()?.eventId

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/ArtifactMetadataTag.kt

@@ -1,49 +0,0 @@
-package press.mantra.compose.nostr.nip30303.tags
-
-import com.vitorpamplona.quartz.nip01Core.core.HexKey
-import com.vitorpamplona.quartz.nip01Core.core.has
-import com.vitorpamplona.quartz.utils.ensure
-
-class ArtifactMetadataTag(
-    val url: String,
-    val visibility: String,
-    val license: String,
-) {
-    fun toTagArray() = assemble(
-        url = url,
-        visibility = visibility,
-        license = license
-    )
-
-    companion object {
-        const val TAG_NAME = "artifact"
-
-        fun parse(tag: Array<String>): ArtifactMetadataTag? {
-            ensure(tag.has(3)) { return null }
-            ensure(tag[0] == TAG_NAME) { return null }
-
-            return ArtifactMetadataTag(
-                url = tag[1],
-                visibility = tag[2],
-                license = tag[3],
-            )
-        }
-
-        fun assemble(
-            url: String,
-            visibility: String,
-            license: String,
-        ): Array<String> = arrayOf(
-            TAG_NAME,
-            url,
-            visibility,
-            license
-        )
-
-        fun assemble(artifactMetadataTag: ArtifactMetadataTag) = assemble(
-            url = artifactMetadataTag.url,
-            visibility = artifactMetadataTag.visibility,
-            license = artifactMetadataTag.license
-        )
-    }
-}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/ChapterMetadataTag.kt

@@ -1,42 +0,0 @@
-package press.mantra.compose.nostr.nip30303.tags
-
-import com.vitorpamplona.quartz.nip01Core.core.has
-import com.vitorpamplona.quartz.utils.ensure
-
-class ChapterMetadataTag(
-    val name: String,
-    val originalText: String,
-) {
-    fun toTagArray() = assemble(
-        name = name,
-        originalText = originalText,
-    )
-
-    companion object {
-        const val TAG_NAME = "chapter"
-
-        fun parse(tag: Array<String>): ChapterMetadataTag? {
-            ensure(tag.has(2)) { return null }
-            ensure(tag[0] == TAG_NAME) { return null }
-
-            return ChapterMetadataTag(
-                name = tag[1],
-                originalText = tag[2],
-            )
-        }
-
-        fun assemble(
-            name: String,
-            originalText: String,
-        ): Array<String> = arrayOf(
-            TAG_NAME,
-            name,
-            originalText,
-        )
-
-        fun assemble(chapterMetadataTag: ChapterMetadataTag) = assemble(
-            name = chapterMetadataTag.name,
-            originalText = chapterMetadataTag.originalText,
-        )
-    }
-}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/CountryTag.kt

@@ -0,0 +1,25 @@
+package press.mantra.compose.nostr.nip30303.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class CountryTag(
+    val country: String,
+) {
+    fun toTagArray() = assemble(country = country)
+
+    companion object {
+        const val TAG_NAME = "country"
+
+        fun parse(tag: Array<String>): CountryTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+
+            return CountryTag(country = tag[1])
+        }
+
+        fun assemble(country: String): Array<String> = arrayOf(TAG_NAME, country)
+
+        fun assemble(countryTag: CountryTag) = assemble(country = countryTag.country)
+    }
+}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/DialectMetadataTag.kt

@@ -1,48 +0,0 @@
-package press.mantra.compose.nostr.nip30303.tags
-
-import com.vitorpamplona.quartz.nip01Core.core.has
-import com.vitorpamplona.quartz.utils.ensure
-
-class DialectMetadataTag(
-    val name: String,
-    val country: String,
-    val language: String,
-) {
-    fun toTagArray() = assemble(
-        name = name,
-        country = country,
-        language = language
-    )
-
-    companion object {
-        const val TAG_NAME = "dialect"
-
-        fun parse(tag: Array<String>): DialectMetadataTag? {
-            ensure(tag.has(3)) { return null }
-            ensure(tag[0] == TAG_NAME) { return null }
-
-            return DialectMetadataTag(
-                name = tag[1],
-                country = tag[2],
-                language = tag[3],
-            )
-        }
-
-        fun assemble(
-            name: String,
-            country: String,
-            language: String,
-        ): Array<String> = arrayOf(
-            TAG_NAME,
-            name,
-            country,
-            language
-        )
-
-        fun assemble(dialectMetadataTag: DialectMetadataTag) = assemble(
-            name = dialectMetadataTag.name,
-            country = dialectMetadataTag.country,
-            language = dialectMetadataTag.language
-        )
-    }
-}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/LanguageTag.kt

@@ -0,0 +1,25 @@
+package press.mantra.compose.nostr.nip30303.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class LanguageTag(
+    val language: String,
+) {
+    fun toTagArray() = assemble(language = language)
+
+    companion object {
+        const val TAG_NAME = "language"
+
+        fun parse(tag: Array<String>): LanguageTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+
+            return LanguageTag(language = tag[1])
+        }
+
+        fun assemble(language: String): Array<String> = arrayOf(TAG_NAME, language)
+
+        fun assemble(languageTag: LanguageTag) = assemble(language = languageTag.language)
+    }
+}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/LicenseTag.kt

@@ -0,0 +1,25 @@
+package press.mantra.compose.nostr.nip30303.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class LicenseTag(
+    val license: String,
+) {
+    fun toTagArray() = assemble(license = license)
+
+    companion object {
+        const val TAG_NAME = "license"
+
+        fun parse(tag: Array<String>): LicenseTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+
+            return LicenseTag(license = tag[1])
+        }
+
+        fun assemble(license: String): Array<String> = arrayOf(TAG_NAME, license)
+
+        fun assemble(licenseTag: LicenseTag) = assemble(license = licenseTag.license)
+    }
+}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/NameTag.kt

@@ -0,0 +1,25 @@
+package press.mantra.compose.nostr.nip30303.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class NameTag(
+    val name: String,
+) {
+    fun toTagArray() = assemble(name = name)
+
+    companion object {
+        const val TAG_NAME = "name"
+
+        fun parse(tag: Array<String>): NameTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+
+            return NameTag(name = tag[1])
+        }
+
+        fun assemble(name: String): Array<String> = arrayOf(TAG_NAME, name)
+
+        fun assemble(nameTag: NameTag) = assemble(name = nameTag.name)
+    }
+}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/OriginalTextTag.kt

@@ -0,0 +1,25 @@
+package press.mantra.compose.nostr.nip30303.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class OriginalTextTag(
+    val originalText: String,
+) {
+    fun toTagArray() = assemble(originalText = originalText)
+
+    companion object {
+        const val TAG_NAME = "original_text"
+
+        fun parse(tag: Array<String>): OriginalTextTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+
+            return OriginalTextTag(originalText = tag[1])
+        }
+
+        fun assemble(originalText: String): Array<String> = arrayOf(TAG_NAME, originalText)
+
+        fun assemble(originalTextTag: OriginalTextTag) = assemble(originalText = originalTextTag.originalText)
+    }
+}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/TranslationArtifactVersionMetadataTag.kt

@@ -1,49 +0,0 @@
-package press.mantra.compose.nostr.nip30303.tags
-
-import com.vitorpamplona.quartz.nip01Core.core.HexKey
-import com.vitorpamplona.quartz.nip01Core.core.has
-import com.vitorpamplona.quartz.utils.ensure
-
-class TranslationArtifactVersionMetadataTag(
-    val name: String,
-    val visibility: String,
-    val license: String,
-) {
-    fun toTagArray() = assemble(
-        name = name,
-        visibility = visibility,
-        license = license
-    )
-
-    companion object {
-        const val TAG_NAME = "artifact"
-
-        fun parse(tag: Array<String>): TranslationArtifactVersionMetadataTag? {
-            ensure(tag.has(3)) { return null }
-            ensure(tag[0] == TAG_NAME) { return null }
-
-            return TranslationArtifactVersionMetadataTag(
-                name = tag[1],
-                visibility = tag[2],
-                license = tag[3],
-            )
-        }
-
-        fun assemble(
-            name: String,
-            visibility: String,
-            license: String,
-        ): Array<String> = arrayOf(
-            TAG_NAME,
-            name,
-            visibility,
-            license
-        )
-
-        fun assemble(translationArtifactVersionMetadataTag: TranslationArtifactVersionMetadataTag) = assemble(
-            name = translationArtifactVersionMetadataTag.name,
-            visibility = translationArtifactVersionMetadataTag.visibility,
-            license = translationArtifactVersionMetadataTag.license
-        )
-    }
-}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/UrlTag.kt

@@ -0,0 +1,25 @@
+package press.mantra.compose.nostr.nip30303.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class UrlTag(
+    val url: String,
+) {
+    fun toTagArray() = assemble(url = url)
+
+    companion object {
+        const val TAG_NAME = "url"
+
+        fun parse(tag: Array<String>): UrlTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+
+            return UrlTag(url = tag[1])
+        }
+
+        fun assemble(url: String): Array<String> = arrayOf(TAG_NAME, url)
+
+        fun assemble(urlTag: UrlTag) = assemble(url = urlTag.url)
+    }
+}

composeApp/src/commonMain/kotlin/press/mantra/compose/nostr/nip30303/tags/VisibilityTag.kt

@@ -0,0 +1,25 @@
+package press.mantra.compose.nostr.nip30303.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class VisibilityTag(
+    val visibility: String,
+) {
+    fun toTagArray() = assemble(visibility = visibility)
+
+    companion object {
+        const val TAG_NAME = "visibility"
+
+        fun parse(tag: Array<String>): VisibilityTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+
+            return VisibilityTag(visibility = tag[1])
+        }
+
+        fun assemble(visibility: String): Array<String> = arrayOf(TAG_NAME, visibility)
+
+        fun assemble(visibilityTag: VisibilityTag) = assemble(visibility = visibilityTag.visibility)
+    }
+}