diff --git a/content/posts/2024-05-19.md b/content/posts/2024-05-19.md
new file mode 100644
index 0000000..713555f
--- /dev/null
+++ b/content/posts/2024-05-19.md
@@ -0,0 +1,19 @@
++++
+title = 2024-05-19
+author = ["SouthFox"]
+date = 2024-05-19T23:43:00+08:00
+lastmod = 2024-05-19T23:59:42+08:00
+tags = ["publish"]
+draft = false
++++
+
+## Scheme 数据类型 {#scheme-数据类型}
+
+在 [Scheme]({{< relref "../main/20240519235937-scheme.md" >}}) 里定义一个数据类型，声明它的构造函数……参数，以及判断方法，还有 set 方法
+
+```scheme
+(define-record-type <vec2>
+  (make-vec2 bv)
+  vec2?
+  (bv vec2-bv))
+```