diff --git a/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/ActivityBuilder.kt b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/ActivityBuilder.kt
new file mode 100644
index 0000000..83ae68d
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/ActivityBuilder.kt
@@ -0,0 +1,11 @@
+package dev.usbharu.activitystreams.impl.builder
+
+import dev.usbharu.activitystreams.impl.type.AbstractJsonObjectBuilder
+import dev.usbharu.activitystreams.impl.type.BuilderContext
+import dev.usbharu.activitystreams.model.core.Activity
+
+class ActivityBuilder : AbstractJsonObjectBuilder<Activity>() {
+    override fun internalBuild(t: Activity, jsonObject: Map<String, Any>, builderContext: BuilderContext) {
+
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/CreateBuilder.kt b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/CreateBuilder.kt
new file mode 100644
index 0000000..219623a
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/CreateBuilder.kt
@@ -0,0 +1,8 @@
+package dev.usbharu.activitystreams.impl.builder
+
+import dev.usbharu.activitystreams.impl.type.AbstractJsonObjectBuilder
+import dev.usbharu.activitystreams.model.core.Activity
+import dev.usbharu.activitystreams.model.core.Object
+
+class CreateBuilder : AbstractJsonObjectBuilder<Activity> {
+}
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/InternalActivityBuilder.kt b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/InternalActivityBuilder.kt
new file mode 100644
index 0000000..ddf95bb
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/InternalActivityBuilder.kt
@@ -0,0 +1,12 @@
+package dev.usbharu.activitystreams.impl.builder
+
+import dev.usbharu.activitystreams.impl.type.AbstractJsonObjectBuilder
+import dev.usbharu.activitystreams.impl.type.BuilderContext
+import dev.usbharu.activitystreams.model.core.InternalActivity
+
+class InternalActivityBuilder : AbstractJsonObjectBuilder<InternalActivity>() {
+    override fun internalBuild(t: InternalActivity, jsonObject: Map<String, Any>, builderContext: BuilderContext) {
+        val typeFactory = builderContext.typeFactory().factory()
+        t.actor =
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/JsonLdBuilder.kt b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/JsonLdBuilder.kt
index fe1702c..4d75f72 100644
--- a/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/JsonLdBuilder.kt
+++ b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/JsonLdBuilder.kt
@@ -5,11 +5,13 @@ import dev.usbharu.activitystreams.impl.type.BuilderContext
 import dev.usbharu.activitystreams.impl.type.JsonObjectBuilder
 import dev.usbharu.activitystreams.model.JsonLd
 import java.net.URI
+import java.util.*
 
 open class JsonLdBuilder : AbstractJsonObjectBuilder<JsonLd>() {
     override fun internalBuild(t: JsonLd, jsonObject: Map<String, Any>, builderContext: BuilderContext) {
         t.value = jsonObject["@value"]
         t.id = jsonObject["@id"]?.toString()?.let { URI.create(it) }
         t.type = (jsonObject["@type"] as? List<String>).orEmpty().map { URI.create(it) }
+        t.language = jsonObject["@language"]?.toString()?.let { Locale.forLanguageTag(it) }
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/ObjectBuilder.kt b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/ObjectBuilder.kt
index 468f29d..6b01c11 100644
--- a/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/ObjectBuilder.kt
+++ b/src/main/kotlin/dev/usbharu/activitystreams/impl/builder/ObjectBuilder.kt
@@ -1,5 +1,7 @@
 package dev.usbharu.activitystreams.impl.builder
 
+import dev.usbharu.activitystreams.impl.model.other.JsonLdImpl
+import dev.usbharu.activitystreams.impl.model.other.LangStringImpl
 import dev.usbharu.activitystreams.impl.type.AbstractJsonObjectBuilder
 import dev.usbharu.activitystreams.impl.type.BuilderContext
 import dev.usbharu.activitystreams.impl.type.JsonObjectBuilder
@@ -9,15 +11,19 @@ import dev.usbharu.activitystreams.model.other.LangString
 import java.net.URI
 
 open class ObjectBuilder : AbstractJsonObjectBuilder<Object>() {
-    override fun build(t: Object, jsonObject: Map<String, Any>, builderContext: BuilderContext) {
-//        t.name =
-    }
-
     override fun internalBuild(t: Object, jsonObject: Map<String, Any>, builderContext: BuilderContext) {
-        val langString = builderContext.typeFactory().factory(URI.create("")) as LangString
-        builderContext.getBuilder(LangString::class.java)
-            .build(langString, jsonObject["https://www.w3.org/ns/activitystreams#name"], builderContext)
-        t.name =
+        val maps = jsonObject["https://www.w3.org/ns/activitystreams#name"] as List<Map<String, String>>
+        t.name = LangStringImpl(
+            null, maps.mapNotNull {
+
+                val jsonLd = JsonLdImpl()
+                builderContext.getBuilder(JsonLd::class.java).build(jsonLd, it, builderContext)
+                (jsonLd.language?.toLanguageTag() ?: return@mapNotNull null) to (jsonLd.value as? String?
+                    ?: return@mapNotNull null)
+            }.toMap(), emptyList(), null, null
+        )
+
+
     }
 
 }
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/impl/model/activity/CreateImpl.kt b/src/main/kotlin/dev/usbharu/activitystreams/impl/model/activity/CreateImpl.kt
index c09b879..4967841 100644
--- a/src/main/kotlin/dev/usbharu/activitystreams/impl/model/activity/CreateImpl.kt
+++ b/src/main/kotlin/dev/usbharu/activitystreams/impl/model/activity/CreateImpl.kt
@@ -11,6 +11,7 @@ import dev.usbharu.activitystreams.model.other.MimeMediaType
 import java.net.URI
 import java.time.Duration
 import java.time.OffsetDateTime
+import java.util.*
 
 class CreateImpl(
     override var type: List<URI> = emptyList(),
@@ -49,4 +50,5 @@ class CreateImpl(
     override var id: URI? = null,
     override var source: ObjectOrLink? = null,
     override var value: Any? = null,
+    override var language: Locale? = null,
 ) : Create
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/impl/model/other/JsonLdImpl.kt b/src/main/kotlin/dev/usbharu/activitystreams/impl/model/other/JsonLdImpl.kt
new file mode 100644
index 0000000..611dc05
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/activitystreams/impl/model/other/JsonLdImpl.kt
@@ -0,0 +1,13 @@
+package dev.usbharu.activitystreams.impl.model.other
+
+import dev.usbharu.activitystreams.model.JsonLd
+import java.net.URI
+import java.util.*
+
+open class JsonLdImpl(
+    override var type: List<URI> = emptyList(),
+    override var id: URI? = null,
+    override var value: Any? = null,
+    override var language: Locale? = null
+) : JsonLd {
+}
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/impl/model/other/LangStringImpl.kt b/src/main/kotlin/dev/usbharu/activitystreams/impl/model/other/LangStringImpl.kt
index b84b066..6dcbca3 100644
--- a/src/main/kotlin/dev/usbharu/activitystreams/impl/model/other/LangStringImpl.kt
+++ b/src/main/kotlin/dev/usbharu/activitystreams/impl/model/other/LangStringImpl.kt
@@ -8,7 +8,7 @@ class LangStringImpl(
     override var value: Any?,
     private val map: Map<String, String>,
     override var type: List<URI> = emptyList(),
-    override var id: URI? = null
+    override var id: URI? = null, override var language: Locale? = null
 ) : LangString {
     override fun getValue(): String? = value?.toString()
 
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/model/JsonLd.kt b/src/main/kotlin/dev/usbharu/activitystreams/model/JsonLd.kt
index c7464fb..4137f88 100644
--- a/src/main/kotlin/dev/usbharu/activitystreams/model/JsonLd.kt
+++ b/src/main/kotlin/dev/usbharu/activitystreams/model/JsonLd.kt
@@ -1,9 +1,11 @@
 package dev.usbharu.activitystreams.model
 
 import java.net.URI
+import java.util.Locale
 
 interface JsonLd {
     var type: List<URI>
     var id: URI?
     var value: Any?
+    var language: Locale?
 }
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/model/core/Activity.kt b/src/main/kotlin/dev/usbharu/activitystreams/model/core/Activity.kt
index c8690f0..24c24f2 100644
--- a/src/main/kotlin/dev/usbharu/activitystreams/model/core/Activity.kt
+++ b/src/main/kotlin/dev/usbharu/activitystreams/model/core/Activity.kt
@@ -2,7 +2,7 @@ package dev.usbharu.activitystreams.model.core
 
 import dev.usbharu.activitystreams.model.ObjectOrLink
 
-sealed interface InternalActivity : dev.usbharu.activitystreams.model.core.Object {
+sealed interface InternalActivity : Object {
     var actor: List<ObjectOrLink>
     var target: List<ObjectOrLink>
     var result: ObjectOrLink?
@@ -10,8 +10,8 @@ sealed interface InternalActivity : dev.usbharu.activitystreams.model.core.Objec
     var instrument: ObjectOrLink?
 }
 
-interface Activity : dev.usbharu.activitystreams.model.core.InternalActivity {
+interface Activity : InternalActivity {
     var `object`: ObjectOrLink?
 }
 
-interface IntransitiveActivity : dev.usbharu.activitystreams.model.core.InternalActivity
\ No newline at end of file
+interface IntransitiveActivity : InternalActivity
\ No newline at end of file