Architecture

        graph TB
    subgraph Bag
        direction TB
        N1[BagNode<br/>label, value, attr]
        N2[BagNode<br/>label, value, attr]
        N3[BagNode<br/>label, value=Bag, attr]
    end

    subgraph NestedBag[Nested Bag]
        direction TB
        N4[BagNode]
        N5[BagNode]
        N6[BagNode]
    end

    N3 --> NestedBag
    

Access Patterns

        flowchart LR
    A["bag['a.b.c']"] --> B[Bag]
    B --> C[BagNode 'a']
    C --> D[Bag]
    D --> E[BagNode 'b']
    E --> F[Bag]
    F --> G[BagNode 'c']
    G --> H[value]
    

        flowchart LR
    A["bag['a?x']"] --> B[Bag]
    B --> C[BagNode 'a']
    C --> D["attr['x']"]
    

Core Components

• Bag: Ordered container of BagNodes

• BagNode: Single node with label, value, and attributes

• Path: Dot-separated string for hierarchical access

• Attribute: Key-value metadata attached to nodes