diff --git a/server/Cargo.toml b/server/Cargo.toml
index 015821f2..a9eb42e1 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -38,6 +38,7 @@ path = "src/lib.rs"
 openapi = { path = "../github-mirror" }
 anyhow = "1.0.86"
 serde = { version = "1.0.203", features = ["derive"] }
+serde-xml-rs = "0.6.0"
 serde_json = "1.0.117"
 tokio = { version = "1.0.0", features = ["rt", "rt-multi-thread", "macros", "fs"] }
 axum = "0.7.5"
diff --git a/server/src/objects/user.rs b/server/src/objects/user.rs
index 2155498f..e7732ce6 100644
--- a/server/src/objects/user.rs
+++ b/server/src/objects/user.rs
@@ -20,10 +20,11 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 use anyhow::Result;
-use log::info;
-use serde::Deserialize;
+use log::{debug, info};
+use serde::{Deserialize, Serialize};
+use serde_xml_rs::to_string;
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct User {
     pub(crate) username: String,
 }
@@ -34,9 +35,38 @@ impl User {
     }
 }
 
+// @todo #17:40min Apply XMLed user to the <users/> node in storage.
+//  We should apply XMLed user to the <users> XML node in storage. First we
+//  need to check that user with provided name does not exist, and only then
+//  apply it to the storage. Keep in mind that application function in the
+//  storage should be thread-safe (as well as #xml function). Don't forget to
+//  create unit tests that prove that.
 impl User {
     pub async fn save(self) -> Result<()> {
         info!("registering user @{}", self.username);
+        let xml = to_string(&self).unwrap();
+        debug!("XMLed user: {}", xml);
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use anyhow::Result;
+    use crate::objects::user::User;
+
+    #[test]
+    fn returns_username() -> Result<()> {
+        let expected = "jeff";
+        let jeff = User::new(String::from(expected));
+        assert_eq!(
+            jeff.username,
+            expected,
+            "Username {} from user: {:?} does not match with expected {}",
+            jeff.username,
+            jeff,
+            expected
+        );
         Ok(())
     }
 }