Make MultistatusElement responder, other refactoring

crates/dav/src/xml/mod.rs

@@ -1,2 +1,20 @@
+pub mod multistatus;
 pub mod tag_list;
 pub mod tag_name;
+
+pub use multistatus::MultistatusElement;
+pub use tag_list::TagList;
+pub use tag_name::TagName;
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct HrefElement {
+    pub href: String,
+}
+
+impl HrefElement {
+    pub fn new(href: String) -> Self {
+        Self { href }
+    }
+}