diff --git a/src/Php/ClassDef.php b/src/Php/ClassDef.php
new file mode 100644
index 00000000..adcd3f1e
--- /dev/null
+++ b/src/Php/ClassDef.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace PhpAot\Php;
+
+class ClassDef
+{
+    public string $name;
+    public array $methods;
+    /**
+     * @var array<PropertyDef>
+     */
+    public array $properties;
+    public array $constants;
+}
\ No newline at end of file
diff --git a/src/Php/ConstDef.php b/src/Php/ConstDef.php
new file mode 100644
index 00000000..a634dc9f
--- /dev/null
+++ b/src/Php/ConstDef.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace PhpAot\Php;
+
+class ConstDef
+{
+    public string $name;
+    public string $type;
+    public string $flags;
+    public string $value;
+
+    public function __construct(string $name, string $flags, string $type, string $value)
+    {
+        $this->name = $name;
+        $this->type = $type;
+        $this->flags = $flags;
+        $this->value = $value;
+    }
+}
\ No newline at end of file
diff --git a/src/Php/PropertyDef.php b/src/Php/PropertyDef.php
new file mode 100644
index 00000000..1df41a5b
--- /dev/null
+++ b/src/Php/PropertyDef.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace PhpAot\Php;
+
+class PropertyDef
+{
+    public string $name;
+    public string $type;
+    public string $flags;
+    public ?string $default =  null;
+
+    public function __construct(string $name, string $flags, string $type, ?string $default = null)
+    {
+        $this->flags = $flags;
+        $this->name = $name;
+        $this->type = $type;
+        $this->default = $default;
+    }
+}
\ No newline at end of file