Struct Link 

#[non_exhaustive]
pub struct Link {
    pub at_type: Option<String>,
    pub kind: Option<String>,
    pub uri: Option<String>,
    pub media_type: Option<String>,
    pub contexts: Option<HashMap<String, bool>>,
    pub pref: Option<u32>,
    pub label: Option<String>,
    pub extra: Map<String, Value>,
}

A generic resource link associated with a Card (RFC 9553 §2.6.3).

Extends the abstract Resource type. The kind value is optional; when set, the only enumerated value is "contact".

uri is mandatory on the wire but modelled as Option to permit partial-response deserialization; callers building a fresh Link MUST populate it. See the crate-level Design: optional fields and Option<...> section.

Distinct from JSCalendar’s Link type (jmap_jscalendar_types::Link); the two are unrelated wire-format types.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

at_type: Option<String>

Object type discriminator; SHOULD be "Link" when present per RFC 9553 §1.3.4 (may be omitted in defaultType positions).

kind: Option<String>

Optional "contact" discriminator.

uri: Option<String>

The resource URI (RFC 3986). Mandatory per RFC 9553 §1.4.4 but modelled as Option for partial-response deserialization.

media_type: Option<String>

IANA media type of the resource.

contexts: Option<HashMap<String, bool>>

Contexts in which to use the resource (key → true).

pref: Option<u32>

Preference order in 1..=100 (lower = more preferred).

label: Option<String>

Custom label for the value.

extra: Map<String, Value>

Catch-all for vendor / site / private extension fields not covered by the typed fields above. Preserves unknown fields across deserialize/serialize round-trip per workspace extras-preservation policy (see workspace AGENTS.md).

Trait Implementations

impl Clone for Link

fn clone(&self) -> Link

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Link

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Link

fn deserialize<__D>( __deserializer: __D, ) -> Result<Link, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Link

impl PartialEq for Link

fn eq(&self, other: &Link) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for Link

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Link