diff --git a/Cargo.lock b/Cargo.lock
index b9b71bd..9e9fb5e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3164,6 +3164,7 @@ dependencies = [
  "tokio",
  "toml",
  "tracing",
+ "uuid",
 ]
 
 [[package]]
diff --git a/README.md b/README.md
index bee79c5..7a158b6 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ docker run \
   -p 4000:4000 \
   -v YOUR_DATA_DIR:/var/lib/rustical/ \
   -v YOUR_CONFIG_TOML:/etc/rustical/config.toml \
+  -v YOUR_PRINCIPALS_TOML:/etc/rustical/principals.toml \
   ghcr.io/lennart-k/rustical
 ```
 
@@ -77,7 +78,7 @@ id = "user"
 displayname = "User"
 password = "$argon2id$......."
 app_tokens = [
-  {name = "Token", token = "$pbkdf2-sha256$........"},
+  {id = "1", name = "Token", token = "$pbkdf2-sha256$........"},
 ]
 memberships = ["group:amazing_group"]
 
@@ -107,8 +108,9 @@ docker run -it --rm ghcr.io/lennart-k/rustical rustical pwhash
 The password is meant as a password you use to log in to the frontend.
 Since it's sensitive information,
 the secure but slow hash algorithm `argon2` is chosen.
+If you've configured OpenID Connect you can also completely omit the password.
 
-I recommend to generate random app tokens for each CalDAV/CardDAV client.
+I recommend to generate random app tokens for each CalDAV/CardDAV client (which can also be done through the frontend).
 These can use the faster `pbkdf2` algorithm.
 
 ### WebDAV Push
diff --git a/crates/frontend/public/templates/pages/calendar.html b/crates/frontend/public/templates/pages/calendar.html
index c94f57b..455ba81 100644
--- a/crates/frontend/public/templates/pages/calendar.html
+++ b/crates/frontend/public/templates/pages/calendar.html
@@ -5,8 +5,30 @@
 
 {% block content %}
 {% let name = calendar.displayname.to_owned().unwrap_or(calendar.id.to_owned()) %}
-<h1>{{ name }}</h1>
+<h1>{{ calendar.principal }}/{{ name }}</h1>
 {% if let Some(description) = calendar.description %}<p>{{ description }}</p>{% endif%}
 
+{% if let Some(subscription_url) = calendar.subscription_url %}
+<h2>Subscription URL</h2>
+<a href="{{ subscription_url }}">{{ subscription_url }}</a>
+{% endif %}
+
+<h2>Components</h2>
+<ul>
+  {% for comp in calendar.components %}
+  <li>{{ comp.as_str() }}</li>
+  {% endfor %}
+</ul>
+
+<h2>Timezone</h2>
+
+{% if let Some(timezone_id) = calendar.timezone_id %}
+<p>{{ timezone_id }}</p>
+{% endif %}
+{% if let Some(timezone) = calendar.timezone %}
+<pre>{{ timezone }}</pre>
+{% endif %}
+
+
 <pre>{{ calendar|json }}</pre>
-{% endblock %}
+{%endblock %}
diff --git a/crates/frontend/public/templates/pages/user.html b/crates/frontend/public/templates/pages/user.html
index 480c41b..0e8794f 100644
--- a/crates/frontend/public/templates/pages/user.html
+++ b/crates/frontend/public/templates/pages/user.html
@@ -72,24 +72,47 @@ li.collection-list-item {
 
 <h3>App tokens</h3>
 
-<ul>
+<table>
+  <tr>
+    <th>Name</th>
+    <th>Created at</th>
+    <th></th>
+  </tr>
   {% for app_token in user.app_tokens %}
-  <li>
-    {{ app_token.name }}
-    {% if let Some(created_at) = app_token.created_at %}
-      {{ created_at.to_rfc3339() }}
-    {% endif %}
-  </li>
+  <tr>
+    <td>{{ app_token.name }}</td>
+    <td>
+      {% if let Some(created_at) = app_token.created_at %}
+        {{ created_at.to_rfc3339() }}
+      {% endif %}
+    </td>
+    <td>
+      <form action="/frontend/user/{{ user.id }}/app_token/{{ app_token.id }}/delete" method="POST">
+        <button type="submit">Delete</button>
+      </form>
+    </td>
+  </tr>
   {% endfor %}
-</ul>
-
+  <tr>
+    <form action="/frontend/user/{{ user.id }}/app_token" method="POST">
+      <td>
+        <label for="generate_app_token_name">App name</label>
+        <input type="text" name="name" id="generate_app_token_name" />
+      </td>
+      <td></td>
+      <td>
+        <button type="submit">Generate</button>
+      </td>
+    </form>
+  </tr>
+</table>
 
 <h2>Calendars</h2>
 <ul>
   {% for calendar in calendars %}
   {% let color = calendar.color.to_owned().unwrap_or("red".to_owned()) %}
   <li class="collection-list-item" style="--color: {{ color }}">
-    <a href="/frontend/user/{{ calendar.principal }}/calendar/{{ calendar.id}}">
+    <a href="/frontend/user/{{ calendar.principal }}/calendar/{{ calendar.id }}">
       <span class="title">{{ calendar.displayname.to_owned().unwrap_or(calendar.id.to_owned()) }}</span>
       <span class="description">
       {% if let Some(description) = calendar.description %}{{ description }}{% endif %}
diff --git a/crates/frontend/src/lib.rs b/crates/frontend/src/lib.rs
index d4fafb3..04a4f86 100644
--- a/crates/frontend/src/lib.rs
+++ b/crates/frontend/src/lib.rs
@@ -1,5 +1,7 @@
 use actix_session::{
-    SessionMiddleware, config::CookieContentSecurity, storage::CookieSessionStore,
+    SessionMiddleware,
+    config::CookieContentSecurity,
+    storage::{CookieSessionStore, SessionStore},
 };
 use actix_web::{
     HttpRequest, HttpResponse, Responder,
@@ -7,12 +9,13 @@ use actix_web::{
     dev::ServiceResponse,
     http::{Method, StatusCode},
     middleware::{ErrorHandlerResponse, ErrorHandlers},
-    web::{self, Data, Path, Redirect},
+    web::{self, Data, Form, Path, Redirect},
 };
 use askama::Template;
 use askama_web::WebTemplate;
 use assets::{Assets, EmbedService};
 use oidc::{route_get_oidc_callback, route_post_oidc};
+use rand::{Rng, distributions::Alphanumeric};
 use routes::{
     addressbook::{route_addressbook, route_addressbook_restore},
     calendar::{route_calendar, route_calendar_restore},
@@ -22,6 +25,7 @@ use rustical_store::{
     Addressbook, AddressbookStore, Calendar, CalendarStore,
     auth::{AuthenticationMiddleware, AuthenticationProvider, User},
 };
+use serde::Deserialize;
 use std::sync::Arc;
 
 mod assets;
@@ -32,6 +36,14 @@ mod routes;
 
 pub use config::FrontendConfig;
 
+pub fn generate_app_token() -> String {
+    rand::thread_rng()
+        .sample_iter(Alphanumeric)
+        .map(char::from)
+        .take(64)
+        .collect()
+}
+
 #[derive(Template, WebTemplate)]
 #[template(path = "pages/user.html")]
 struct UserPage {
@@ -105,6 +117,36 @@ async fn route_root(user: Option<User>, req: HttpRequest) -> impl Responder {
     web::Redirect::to(redirect_url.to_string()).permanent()
 }
 
+#[derive(Debug, Clone, Deserialize)]
+pub(crate) struct PostAppTokenForm {
+    name: String,
+}
+
+async fn route_post_app_token<AP: AuthenticationProvider>(
+    user: User,
+    auth_provider: Data<AP>,
+    path: Path<String>,
+    Form(PostAppTokenForm { name }): Form<PostAppTokenForm>,
+) -> Result<impl Responder, rustical_store::Error> {
+    assert_eq!(path.into_inner(), user.id);
+    let token = generate_app_token();
+    auth_provider
+        .add_app_token(&user.id, name, token.clone())
+        .await?;
+    Ok(token)
+}
+
+async fn route_delete_app_token<AP: AuthenticationProvider>(
+    user: User,
+    auth_provider: Data<AP>,
+    path: Path<(String, String)>,
+) -> Result<Redirect, rustical_store::Error> {
+    let (path_user, token_id) = path.into_inner();
+    assert_eq!(path_user, user.id);
+    auth_provider.remove_app_token(&user.id, &token_id).await?;
+    Ok(Redirect::to("/frontend/user").see_other())
+}
+
 pub(crate) fn unauthorized_handler<B>(
     res: ServiceResponse<B>,
 ) -> actix_web::Result<ErrorHandlerResponse<B>> {
@@ -136,6 +178,14 @@ pub(crate) fn unauthorized_handler<B>(
     Ok(ErrorHandlerResponse::Response(res))
 }
 
+pub fn session_middleware(frontend_secret: [u8; 64]) -> SessionMiddleware<impl SessionStore> {
+    SessionMiddleware::builder(CookieSessionStore::default(), Key::from(&frontend_secret))
+        .cookie_secure(true)
+        .cookie_same_site(SameSite::Strict)
+        .cookie_content_security(CookieContentSecurity::Private)
+        .build()
+}
+
 pub fn configure_frontend<AP: AuthenticationProvider, CS: CalendarStore, AS: AddressbookStore>(
     cfg: &mut web::ServiceConfig,
     auth_provider: Arc<AP>,
@@ -147,16 +197,7 @@ pub fn configure_frontend<AP: AuthenticationProvider, CS: CalendarStore, AS: Add
         web::scope("")
             .wrap(ErrorHandlers::new().handler(StatusCode::UNAUTHORIZED, unauthorized_handler))
             .wrap(AuthenticationMiddleware::new(auth_provider.clone()))
-            .wrap(
-                SessionMiddleware::builder(
-                    CookieSessionStore::default(),
-                    Key::from(&frontend_config.secret_key),
-                )
-                .cookie_secure(true)
-                .cookie_same_site(SameSite::Strict)
-                .cookie_content_security(CookieContentSecurity::Private)
-                .build(),
-            )
+            .wrap(session_middleware(frontend_config.secret_key))
             .app_data(Data::from(auth_provider))
             .app_data(Data::from(cal_store.clone()))
             .app_data(Data::from(addr_store.clone()))
@@ -173,6 +214,14 @@ pub fn configure_frontend<AP: AuthenticationProvider, CS: CalendarStore, AS: Add
                     .route(web::method(Method::GET).to(route_user_named::<CS, AS>))
                     .name("frontend_user_named"),
             )
+            .service(
+                web::resource("/user/{user}/app_token")
+                    .route(web::method(Method::POST).to(route_post_app_token::<AP>)),
+            )
+            .service(
+                web::resource("/user/{user}/app_token/{id}/delete")
+                    .route(web::method(Method::POST).to(route_delete_app_token::<AP>)),
+            )
             .service(
                 web::resource("/user/{user}/calendar/{calendar}")
                     .route(web::method(Method::GET).to(route_calendar::<CS>)),
diff --git a/crates/frontend/src/nextcloud_login/mod.rs b/crates/frontend/src/nextcloud_login/mod.rs
new file mode 100644
index 0000000..065db12
--- /dev/null
+++ b/crates/frontend/src/nextcloud_login/mod.rs
@@ -0,0 +1,78 @@
+use actix_web::{
+    http::StatusCode,
+    middleware::ErrorHandlers,
+    web::{self, Data, ServiceConfig},
+};
+use chrono::{DateTime, Utc};
+use routes::{get_nextcloud_flow, post_nextcloud_flow, post_nextcloud_login, post_nextcloud_poll};
+use rustical_store::auth::{AuthenticationMiddleware, AuthenticationProvider};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::sync::Arc;
+use tokio::sync::RwLock;
+mod routes;
+
+#[derive(Debug, Clone)]
+struct NextcloudFlow {
+    app_name: String,
+    created_at: DateTime<Utc>,
+    token: String,
+    response: Option<NextcloudSuccessResponse>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct NextcloudSuccessResponse {
+    server: String,
+    login_name: String,
+    app_password: String,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct NextcloudLoginResponse {
+    poll: NextcloudLoginPoll,
+    login: String,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct NextcloudLoginPoll {
+    token: String,
+    endpoint: String,
+}
+
+#[derive(Debug, Default)]
+pub struct NextcloudFlows {
+    flows: RwLock<HashMap<String, NextcloudFlow>>,
+}
+
+use crate::{session_middleware, unauthorized_handler};
+
+pub fn configure_nextcloud_login<AP: AuthenticationProvider>(
+    cfg: &mut ServiceConfig,
+    nextcloud_flows_state: Arc<NextcloudFlows>,
+    auth_provider: Arc<AP>,
+    frontend_secret: [u8; 64],
+) {
+    cfg.service(
+        web::scope("/index.php/login/v2")
+            .wrap(ErrorHandlers::new().handler(StatusCode::UNAUTHORIZED, unauthorized_handler))
+            .wrap(AuthenticationMiddleware::new(auth_provider.clone()))
+            .wrap(session_middleware(frontend_secret))
+            .app_data(Data::from(nextcloud_flows_state))
+            .app_data(Data::from(auth_provider.clone()))
+            .service(web::resource("").post(post_nextcloud_login))
+            .service(
+                web::resource("/poll/{flow}")
+                    .name("nc_login_poll")
+                    .post(post_nextcloud_poll::<AP>),
+            )
+            .service(
+                web::resource("/flow/{flow}")
+                    .name("nc_login_flow")
+                    .get(get_nextcloud_flow)
+                    .post(post_nextcloud_flow),
+            ),
+    );
+}
diff --git a/crates/frontend/src/nextcloud_login.rs b/crates/frontend/src/nextcloud_login/routes.rs
similarity index 60%
rename from crates/frontend/src/nextcloud_login.rs
rename to crates/frontend/src/nextcloud_login/routes.rs
index ab3cc6e..6efee66 100644
--- a/crates/frontend/src/nextcloud_login.rs
+++ b/crates/frontend/src/nextcloud_login/routes.rs
@@ -1,55 +1,21 @@
-use actix_session::{
-    SessionMiddleware, config::CookieContentSecurity, storage::CookieSessionStore,
+use crate::generate_app_token;
+
+use super::{
+    NextcloudFlow, NextcloudFlows, NextcloudLoginPoll, NextcloudLoginResponse,
+    NextcloudSuccessResponse,
 };
 use actix_web::{
     HttpRequest, HttpResponse, Responder,
-    cookie::{Key, SameSite},
-    http::{
-        StatusCode,
-        header::{self},
-    },
-    middleware::ErrorHandlers,
-    web::{self, Data, Form, Html, Json, Path, ServiceConfig},
+    http::header::{self},
+    web::{Data, Form, Html, Json, Path},
 };
 use askama::Template;
-use chrono::{DateTime, Duration, Utc};
-use rand::{Rng, distributions::Alphanumeric};
-use rustical_store::auth::{AuthenticationMiddleware, AuthenticationProvider, User};
+use chrono::{Duration, Utc};
+use rustical_store::auth::{AuthenticationProvider, User};
 use serde::{Deserialize, Serialize};
-use std::{collections::HashMap, sync::Arc};
-use tokio::sync::RwLock;
 use tracing::instrument;
 
-use crate::unauthorized_handler;
-
-#[derive(Debug, Clone)]
-struct NextcloudFlow {
-    app_name: String,
-    created_at: DateTime<Utc>,
-    token: String,
-    response: Option<NextcloudSuccessResponse>,
-}
-
-#[derive(Debug, Default)]
-pub struct NextcloudFlows {
-    flows: RwLock<HashMap<String, NextcloudFlow>>,
-}
-
-#[derive(Debug, Clone, Deserialize, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct NextcloudLoginPoll {
-    token: String,
-    endpoint: String,
-}
-
-#[derive(Debug, Clone, Deserialize, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct NextcloudLoginResponse {
-    poll: NextcloudLoginPoll,
-    login: String,
-}
-
-async fn post_nextcloud_login(
+pub(crate) async fn post_nextcloud_login(
     req: HttpRequest,
     state: Data<NextcloudFlows>,
 ) -> Json<NextcloudLoginResponse> {
@@ -95,19 +61,11 @@ async fn post_nextcloud_login(
 
 #[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
-struct NextcloudSuccessResponse {
-    server: String,
-    login_name: String,
-    app_password: String,
-}
-
-#[derive(Debug, Clone, Deserialize, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct NextcloudPollForm {
+pub(crate) struct NextcloudPollForm {
     token: String,
 }
 
-async fn post_nextcloud_poll<AP: AuthenticationProvider>(
+pub(crate) async fn post_nextcloud_poll<AP: AuthenticationProvider>(
     state: Data<NextcloudFlows>,
     form: Form<NextcloudPollForm>,
     path: Path<String>,
@@ -143,14 +101,6 @@ async fn post_nextcloud_poll<AP: AuthenticationProvider>(
     }
 }
 
-fn generate_app_token() -> String {
-    rand::thread_rng()
-        .sample_iter(Alphanumeric)
-        .map(char::from)
-        .take(64)
-        .collect()
-}
-
 #[derive(Template)]
 #[template(path = "pages/nextcloud_login/form.html")]
 struct NextcloudLoginPage {
@@ -159,7 +109,7 @@ struct NextcloudLoginPage {
 }
 
 #[instrument(skip(state, req))]
-async fn get_nextcloud_flow(
+pub(crate) async fn get_nextcloud_flow(
     user: User,
     state: Data<NextcloudFlows>,
     path: Path<String>,
@@ -183,7 +133,7 @@ async fn get_nextcloud_flow(
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize)]
-struct NextcloudAuthorizeForm {
+pub(crate) struct NextcloudAuthorizeForm {
     app_name: String,
 }
 
@@ -194,7 +144,7 @@ struct NextcloudLoginSuccessPage {
 }
 
 #[instrument(skip(state, req))]
-async fn post_nextcloud_flow(
+pub(crate) async fn post_nextcloud_flow(
     user: User,
     state: Data<NextcloudFlows>,
     path: Path<String>,
@@ -222,40 +172,3 @@ async fn post_nextcloud_flow(
         Ok(HttpResponse::NotFound().body("Login flow not found"))
     }
 }
-
-pub fn configure_nextcloud_login<AP: AuthenticationProvider>(
-    cfg: &mut ServiceConfig,
-    nextcloud_flows_state: Arc<NextcloudFlows>,
-    auth_provider: Arc<AP>,
-    frontend_secret: [u8; 64],
-) {
-    cfg.service(
-        web::scope("/index.php/login/v2")
-            .wrap(ErrorHandlers::new().handler(StatusCode::UNAUTHORIZED, unauthorized_handler))
-            .wrap(AuthenticationMiddleware::new(auth_provider.clone()))
-            .wrap(
-                SessionMiddleware::builder(
-                    CookieSessionStore::default(),
-                    Key::from(&frontend_secret),
-                )
-                .cookie_secure(true)
-                .cookie_same_site(SameSite::Strict)
-                .cookie_content_security(CookieContentSecurity::Private)
-                .build(),
-            )
-            .app_data(Data::from(nextcloud_flows_state))
-            .app_data(Data::from(auth_provider.clone()))
-            .service(web::resource("").post(post_nextcloud_login))
-            .service(
-                web::resource("/poll/{flow}")
-                    .name("nc_login_poll")
-                    .post(post_nextcloud_poll::<AP>),
-            )
-            .service(
-                web::resource("/flow/{flow}")
-                    .name("nc_login_flow")
-                    .get(get_nextcloud_flow)
-                    .post(post_nextcloud_flow),
-            ),
-    );
-}
diff --git a/crates/store/Cargo.toml b/crates/store/Cargo.toml
index ab2651b..28c77f3 100644
--- a/crates/store/Cargo.toml
+++ b/crates/store/Cargo.toml
@@ -28,6 +28,7 @@ rustical_xml.workspace = true
 toml.workspace = true
 tokio.workspace = true
 rand.workspace = true
+uuid.workspace = true
 
 [dev-dependencies]
 rstest = { workspace = true }
diff --git a/crates/store/src/auth/mod.rs b/crates/store/src/auth/mod.rs
index 87dc280..f3c8a66 100644
--- a/crates/store/src/auth/mod.rs
+++ b/crates/store/src/auth/mod.rs
@@ -9,7 +9,14 @@ pub trait AuthenticationProvider: 'static {
     async fn get_principal(&self, id: &str) -> Result<Option<User>, crate::Error>;
     async fn insert_principal(&self, user: User) -> Result<(), crate::Error>;
     async fn validate_user_token(&self, user_id: &str, token: &str) -> Result<Option<User>, Error>;
-    async fn add_app_token(&self, user_id: &str, name: String, token: String) -> Result<(), Error>;
+    /// Returns a token identifier
+    async fn add_app_token(
+        &self,
+        user_id: &str,
+        name: String,
+        token: String,
+    ) -> Result<String, Error>;
+    async fn remove_app_token(&self, user_id: &str, token_id: &str) -> Result<(), Error>;
 }
 
 pub use middleware::AuthenticationMiddleware;
diff --git a/crates/store/src/auth/toml_user_store.rs b/crates/store/src/auth/toml_user_store.rs
index de3ebd1..ca0780f 100644
--- a/crates/store/src/auth/toml_user_store.rs
+++ b/crates/store/src/auth/toml_user_store.rs
@@ -101,9 +101,16 @@ impl AuthenticationProvider for TomlPrincipalStore {
         Ok(None)
     }
 
-    async fn add_app_token(&self, user_id: &str, name: String, token: String) -> Result<(), Error> {
+    /// Returns an identifier for the new app token
+    async fn add_app_token(
+        &self,
+        user_id: &str,
+        name: String,
+        token: String,
+    ) -> Result<String, Error> {
         let mut principals = self.principals.write().await;
         if let Some(principal) = principals.get_mut(user_id) {
+            let id = uuid::Uuid::new_v4().to_string();
             let salt = SaltString::generate(OsRng);
             let token_hash = pbkdf2::Pbkdf2
                 .hash_password_customized(
@@ -122,11 +129,23 @@ impl AuthenticationProvider for TomlPrincipalStore {
                 name,
                 token: token_hash,
                 created_at: Some(chrono::Utc::now()),
+                id: id.clone(),
             });
             self.save(principals.deref())?;
-            Ok(())
+            Ok(id)
         } else {
             Err(Error::NotFound)
         }
     }
+
+    async fn remove_app_token(&self, user_id: &str, token_id: &str) -> Result<(), Error> {
+        let mut principals = self.principals.write().await;
+        if let Some(principal) = principals.get_mut(user_id) {
+            principal
+                .app_tokens
+                .retain(|AppToken { id, .. }| token_id != id);
+            self.save(principals.deref())?;
+        }
+        Ok(())
+    }
 }
diff --git a/crates/store/src/auth/user.rs b/crates/store/src/auth/user.rs
index e332406..7c34bdc 100644
--- a/crates/store/src/auth/user.rs
+++ b/crates/store/src/auth/user.rs
@@ -37,6 +37,7 @@ impl ValueSerialize for PrincipalType {
 
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AppToken {
+    pub id: String,
     pub name: String,
     pub token: String,
     pub created_at: Option<DateTime<Utc>>,
diff --git a/crates/store/src/calendar/object.rs b/crates/store/src/calendar/object.rs
index 9e23f85..0b1cbd4 100644
--- a/crates/store/src/calendar/object.rs
+++ b/crates/store/src/calendar/object.rs
@@ -1,6 +1,6 @@
 use super::{CalDateTime, EventObject, JournalObject, TodoObject};
 use crate::Error;
-use ical::parser::{ical::component::IcalTimeZone, Component};
+use ical::parser::{Component, ical::component::IcalTimeZone};
 use serde::Serialize;
 use sha2::{Digest, Sha256};
 use std::{collections::HashMap, io::BufReader};
@@ -13,14 +13,19 @@ pub enum CalendarObjectType {
     Journal = 2,
 }
 
-impl rustical_xml::ValueSerialize for CalendarObjectType {
-    fn serialize(&self) -> String {
+impl CalendarObjectType {
+    pub fn as_str(&self) -> &'static str {
         match self {
             CalendarObjectType::Event => "VEVENT",
             CalendarObjectType::Todo => "VTODO",
             CalendarObjectType::Journal => "VJOURNAL",
         }
-        .to_owned()
+    }
+}
+
+impl rustical_xml::ValueSerialize for CalendarObjectType {
+    fn serialize(&self) -> String {
+        self.as_str().to_owned()
     }
 }