Struct GlobalMetadata 

pub struct GlobalMetadata {
    pub version: u16,
    pub base: Vec<BTreeMap<String, Value>>,
    pub reserved: BTreeMap<String, Value>,
    pub extra: BTreeMap<String, Value>,
}

Global message metadata (carried in header/footer metadata frames).

The metadata frame CBOR has three named sections plus version:

• base: per-object metadata array — one entry per data object, each entry holds ALL structured metadata for that object independently. The encoder auto-populates _reserved_.tensor (ndim/shape/strides/dtype) in each entry.
• _reserved_: library internals (provenance: encoder info, time, uuid). Client code can read but MUST NOT write — the encoder validates this.
• _extra_: client-writable catch-all for ad-hoc message-level annotations.

Unknown CBOR keys at the top level are silently ignored on decode.

Fields

version: u16

base: Vec<BTreeMap<String, Value>>

Per-object metadata array. Each entry holds ALL structured metadata for that data object. Entries are independent — no tracking of what is common across objects.

The encoder auto-populates _reserved_.tensor (with ndim, shape, strides, dtype) in each entry. Application code may pre-populate additional keys (e.g. "mars": {…}) before encoding; the encoder preserves them.

reserved: BTreeMap<String, Value>

Library internals — provenance info (encoder, time, uuid). Client code can read but MUST NOT write; the encoder overwrites this.

extra: BTreeMap<String, Value>

Client-writable catch-all for ad-hoc message-level annotations.

Trait Implementations

impl Clone for GlobalMetadata

fn clone(&self) -> GlobalMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GlobalMetadata

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

Formats the value using the given formatter.

impl Default for GlobalMetadata

fn default() -> GlobalMetadata

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for GlobalMetadata

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for GlobalMetadata

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.