Enum MetaKey 

#[non_exhaustive]
pub enum MetaKey {
    Ext,
    Seed,
}

Which out-of-band system-metadata map a PayloadItem::Meta carries.

$ext and $seed are the same shape: an opaque Map<String, Value> that never reaches the plate JSON and round-trips through Markdown and the storage DTO, so the live model represents them as one variant discriminated by this key. They differ only in their canonical sort rank, whether they are root-only, and (downstream of storage) whether the seeding layer interprets them: $ext is opaque; $seed is read by crate::SeedOverlay::from_json.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Ext

$ext: opaque out-of-band consumer state (editor renames, agent annotations). Allowed on any card.

Seed

$seed: per-card-kind seed overlays. Root-only (like $quill).

Implementations

impl MetaKey

pub fn as_str(self) -> &'static str

The literal source key ("$ext" / "$seed").

pub fn from_key_str(key: &str) -> Option<Self>

Parse the source key ("$ext" / "$seed"), or None for any other key.

pub fn is_root_only(self) -> bool

true when the key may appear on the root card only (rejected on composable cards), like $quill.

Trait Implementations

impl Clone for MetaKey

fn clone(&self) -> MetaKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MetaKey

impl Debug for MetaKey

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

Formats the value using the given formatter.

impl Eq for MetaKey

impl PartialEq for MetaKey

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MetaKey