diff --git a/src/main/java/io/github/paldiu/simplexcore/SimplexCore.java b/src/main/java/io/github/paldiu/simplexcore/SimplexCore.java
index 8447bcc..3b394a9 100644
--- a/src/main/java/io/github/paldiu/simplexcore/SimplexCore.java
+++ b/src/main/java/io/github/paldiu/simplexcore/SimplexCore.java
@@ -2,7 +2,7 @@ package io.github.paldiu.simplexcore;
 
 import io.github.paldiu.simplexcore.command.defaults.Command_info;
 import io.github.paldiu.simplexcore.concurrent.Announcer;
-import io.github.paldiu.simplexcore.listener.ServerPluginListener;
+import io.github.paldiu.simplexcore.listener.DependencyListener;
 import io.github.paldiu.simplexcore.listener.SimplexListener;
 import io.github.paldiu.simplexcore.plugin.SimplexAddon;
 import io.github.paldiu.simplexcore.utils.Constants;
@@ -35,7 +35,7 @@ public final class SimplexCore extends SimplexAddon<SimplexCore> {
             Constants.getCommandLoader().classpath(Command_info.class).load();
             Constants.getConfig().reload();
             //
-            SimplexListener.register(new ServerPluginListener(), this);
+            SimplexListener.register(new DependencyListener(), this);
             new Announcer();
         } catch (Exception ex) {
             suspended = true;
diff --git a/src/main/java/io/github/paldiu/simplexcore/listener/ServerPluginListener.java b/src/main/java/io/github/paldiu/simplexcore/listener/DependencyListener.java
similarity index 95%
rename from src/main/java/io/github/paldiu/simplexcore/listener/ServerPluginListener.java
rename to src/main/java/io/github/paldiu/simplexcore/listener/DependencyListener.java
index 7a68fc8..052b6da 100644
--- a/src/main/java/io/github/paldiu/simplexcore/listener/ServerPluginListener.java
+++ b/src/main/java/io/github/paldiu/simplexcore/listener/DependencyListener.java
@@ -9,7 +9,7 @@ import org.bukkit.event.server.PluginEnableEvent;
 import java.util.ArrayList;
 import java.util.List;
 
-public final class ServerPluginListener extends SimplexListener {
+public final class DependencyListener extends SimplexListener {
     public List<String> PAPI_NAMES = new ArrayList<>() {{
         add("PlaceholderAPI");
         add("PlaceHolderAPI");
diff --git a/src/main/java/io/github/paldiu/simplexcore/sign/IUsableSign.java b/src/main/java/io/github/paldiu/simplexcore/sign/IUsableSign.java
new file mode 100644
index 0000000..0523067
--- /dev/null
+++ b/src/main/java/io/github/paldiu/simplexcore/sign/IUsableSign.java
@@ -0,0 +1,17 @@
+package io.github.paldiu.simplexcore.sign;
+
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+
+public interface IUsableSign {
+    Block getBlock();
+
+    Location getSignLocation();
+
+    World getWorld();
+
+    String getSignText();
+
+    void executeOnInteract();
+}
diff --git a/src/main/java/io/github/paldiu/simplexcore/structures/IStructure.java b/src/main/java/io/github/paldiu/simplexcore/structures/IStructure.java
new file mode 100644
index 0000000..fb32415
--- /dev/null
+++ b/src/main/java/io/github/paldiu/simplexcore/structures/IStructure.java
@@ -0,0 +1,29 @@
+package io.github.paldiu.simplexcore.structures;
+
+import io.github.paldiu.simplexcore.math.Size;
+import org.bukkit.Location;
+import org.bukkit.NamespacedKey;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+
+public interface IStructure {
+    NamespacedKey getNamespacedKey();
+
+    String getName();
+
+    int getId();
+
+    Location getLocation();
+
+    World getWorld();
+
+    boolean shouldGenerateNaturally();
+
+    void generate(Location location, World world);
+
+    void generate(Location location, World world, boolean generateNaturally);
+
+    Size getApproximateSize();
+
+    Block[] getBlocks();
+}
diff --git a/src/main/java/io/github/paldiu/simplexcore/structures/Structure.java b/src/main/java/io/github/paldiu/simplexcore/structures/Structure.java
new file mode 100644
index 0000000..a101a7c
--- /dev/null
+++ b/src/main/java/io/github/paldiu/simplexcore/structures/Structure.java
@@ -0,0 +1,5 @@
+package io.github.paldiu.simplexcore.structures;
+
+public class Structure {
+    // TODO: Write this file to parse schematics.
+}