diff --git a/chapi-domain/src/main/kotlin/chapi/domain/expr/Expression.kt b/chapi-domain/src/main/kotlin/chapi/domain/expr/Expression.kt
new file mode 100644
index 00000000..c6535764
--- /dev/null
+++ b/chapi-domain/src/main/kotlin/chapi/domain/expr/Expression.kt
@@ -0,0 +1,28 @@
+package chapi.domain.expr
+
+import java.util.function.BinaryOperator
+import java.util.function.IntBinaryOperator
+
+class Expression(
+    var Type: ExpressionType,
+    var Value: String = "",
+    var Children: Array<Expression> = arrayOf()
+)
+
+enum class ExpressionType {
+    Primary,
+    Infix,
+    Prefix,
+    Postfix,
+}
+
+enum class Arithmetics : BinaryOperator<Int>, IntBinaryOperator {
+    PLUS {
+        override fun apply(t: Int, u: Int): Int {
+            return t + u
+        }
+    }
+    ;
+
+    override fun applyAsInt(t: Int, u: Int) = apply(t, u)
+}