diff --git a/src/main/kotlin/dev/usbharu/activitystreams/JsonLd.kt b/src/main/kotlin/dev/usbharu/activitystreams/JsonLd.kt
new file mode 100644
index 0000000..9c59a74
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/activitystreams/JsonLd.kt
@@ -0,0 +1,8 @@
+package dev.usbharu.activitystreams
+
+import java.net.URI
+
+interface JsonLd {
+    var type: List<String>
+    var id: URI
+}
\ No newline at end of file
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/core/Link.kt b/src/main/kotlin/dev/usbharu/activitystreams/core/Link.kt
index 443d608..f15e53b 100644
--- a/src/main/kotlin/dev/usbharu/activitystreams/core/Link.kt
+++ b/src/main/kotlin/dev/usbharu/activitystreams/core/Link.kt
@@ -6,7 +6,7 @@ import dev.usbharu.activitystreams.other.MimeMediaType
 import java.net.URI
 import java.util.Locale
 
-interface Link : ObjectOrLink, UriOrLink, CollectionOrLink, ImageOrLink, CollectionPageOrLink {
+interface Link : ObjectOrLink, UriOrLink, CollectionOrLink, ImageOrLink, CollectionPageOrLink, JsonLd {
     var href: URI?
     var rel: Set<String>
     var mediaType: MimeMediaType?
diff --git a/src/main/kotlin/dev/usbharu/activitystreams/core/Object.kt b/src/main/kotlin/dev/usbharu/activitystreams/core/Object.kt
index 6b4ff5f..9930e4c 100644
--- a/src/main/kotlin/dev/usbharu/activitystreams/core/Object.kt
+++ b/src/main/kotlin/dev/usbharu/activitystreams/core/Object.kt
@@ -6,7 +6,7 @@ import dev.usbharu.activitystreams.other.MimeMediaType
 import java.time.Duration
 import java.time.OffsetDateTime
 
-interface Object : ObjectOrLink {
+interface Object : ObjectOrLink,JsonLd {
     var attachment: ObjectOrLink?
     var attributedTo: ObjectOrLink?
     var audience: ObjectOrLink?