Long-polling using cross domain XHR

- `Anything`
  - `Object`
    - `Basic` ...and other supertypes
      - `Transport`
        - `xhr`

- `xhr`
  - `Transport`
    - `Basic`
      - `Identifiable`
      - `Object`
        - `Anything`

no subtypes hierarchy

Inherited Attributes
Attributes inherited from: `Object` `hash`, `string`
Attributes inherited from: `Transport` `name`

Inherited Methods
Methods inherited from: `Object` `equals`