HelloWorld {                  // Prefab name is optional
    Visible,                  // Prefab fields can be either components...    
    InsertSpriteBundle!(),    // Or "BuildPrefabCommands".
    Transform {               // Components can have fields
        translation: Vec3 {   // Fields should be in name: value format.
            x: 15.0           // Vecs and color support the expected fields
        },                    // Omitted fields will be set to default
    },                        // Commas are required between components
    Transform {               // Components and build commands are applied in the order written
        translation: Vec3 {   
            y: 10.0           // This will override the previous transform
        },
    },
    InsertPbrBundle!(                 // Build commands can optionally take fields as properties
        texture_path: "alien.png",    // Which properties are used depends on the command.
        color: Color::BLUE,           // Certain types support preset values
    ),            
    SetColorMaterial!(                // Some commands will be selective about what they override
        color: Color::RED,            // Here we can set the material color without changing the texture
    ),
    InsertOrthographicCameraBundle!(  // Others aren't so selective. This will override the previously set Transform.
        scale: 0.5,                 
    ),
}