diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Layers.java b/src/main/java/org/ntlab/acanthus_server/entities/Layers.java
new file mode 100644
index 0000000..e6f860d
--- /dev/null
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Layers.java
@@ -0,0 +1,4 @@
+package org.ntlab.acanthus_server.entities;
+
+public class Layers {
+}
diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Page.java b/src/main/java/org/ntlab/acanthus_server/entities/Page.java
new file mode 100644
index 0000000..8a7ef3c
--- /dev/null
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Page.java
@@ -0,0 +1,4 @@
+package org.ntlab.acanthus_server.entities;
+
+public class Page {
+}
diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Position.java b/src/main/java/org/ntlab/acanthus_server/entities/Position.java
new file mode 100644
index 0000000..ef23208
--- /dev/null
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Position.java
@@ -0,0 +1,5 @@
+package org.ntlab.acanthus_server.entities;
+
+public class Position {
+    
+}
diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java b/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
new file mode 100644
index 0000000..17dc6c7
--- /dev/null
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
@@ -0,0 +1,5 @@
+package org.ntlab.acanthus_server.entities;
+
+public class Stroke {
+
+}