get:
  tags:
    - Import/Export
  summary: Export Core - bulk export triples and embeddings
  description: |
    Export knowledge cores in bulk using streaming MessagePack format.

    ## Export Core Overview

    Bulk data export for knowledge graph:
    - **Format**: MessagePack streaming
    - **Content**: Triples and graph embeddings
    - **Source**: Global knowledge storage
    - **Use**: Backups, data migration, archival

    ## MessagePack Protocol

    Response body is MessagePack stream with message tuples:

    ### Triple Message
    ```
    ("t", {
      "m": {              // Metadata
        "i": "core-id",   // Knowledge core ID
        "m": [...],       // Metadata triples array
        "u": "user",      // User
        "c": "collection" // Collection
      },
      "t": [...]          // Triples array
    })
    ```

    ### Graph Embeddings Message
    ```
    ("ge", {
      "m": {              // Metadata
        "i": "core-id",
        "m": [...],
        "u": "user",
        "c": "collection"
      },
      "e": [              // Entities array
        {
          "e": {"v": "uri", "e": true},  // Entity RdfValue
          "v": [0.1, 0.2, ...]             // Vectors
        }
      ]
    })
    ```

    ### End of Stream Message
    ```
    ("eos", {})
    ```

    ## Query Parameters

    - **id**: Knowledge core ID to export
    - **user**: User identifier

    ## Streaming

    Data streamed incrementally:
    - Triples sent first
    - Graph embeddings sent next
    - EOS marker signals completion

    Client should process messages as received.

    ## Use Cases

    - **Backups**: Export for disaster recovery
    - **Data migration**: Move to another system
    - **Archival**: Long-term storage
    - **Replication**: Copy knowledge cores
    - **Analysis**: External processing

  operationId: exportCore
  security:
    - bearerAuth: []
  parameters:
    - name: id
      in: query
      required: true
      schema:
        type: string
      description: Knowledge core ID to export
      example: core-123
    - name: user
      in: query
      required: true
      schema:
        type: string
      description: User identifier
      example: alice
  responses:
    '200':
      description: Export stream
      content:
        application/msgpack:
          schema:
            type: string
            format: binary
            description: MessagePack stream of knowledge data
    '401':
      $ref: '../components/responses/Unauthorized.yaml'
    '500':
      $ref: '../components/responses/Error.yaml'