An address can be matched to one of six verification levels. These verification levels
are directly returned by the tQASAddressRow component
to indicate the returned match type of the checked addresses. Moreover, the output flows
of the other QAS components are adapted to match to one or more of the below
verification levels.

The six QuickAddress verification levels are:

• Verified: The address searched upon is matched to a single deliverable
  address in the QuickAddress data. The verified result may be slightly different
  from the address entered and searched upon, as any formatting and spelling
  errors will have been corrected, and any missing elements will have been added.
  When this match type is returned, no further user interaction is
  required.

• Interaction required: The address searched upon is matched to a single
  deliverable address in the QuickAddress data, although there is less confident
  about the match than for the verified level above, and
  therefore user interaction is recommended to confirm that it is the correct
  address.

• PremisesPartial: The address searched upon is not matched
  to a complete deliverable result in the QuickAddress data, and instead has been
  matched to a partially-complete address.

  For example, the address is matched to a premises in the QuickAddress data,
  but a complete deliverable match could not be found: “63 Southerton Road,
  London” rather than “Flat A, 63 Southerton Road, London”.

• StreetPartial: The address searched upon is not matched
  to a complete deliverable result in the QuickAddress data, and instead has been
  matched to a partially-complete address.

  For example, the address is matched to a street in the QuickAddress data, but
  a complete deliverable match could not be found: “Kew Road, Richmond” rather
  than “88 Kew Road, Richmond”.

• Multiple: The address searched upon is not matched to a
  single deliverable result in the QuickAddress data, and instead has matched
  equally to more than one result.

  For example, the address is matched to two equally valid addresses that can
  only be distinguished by address information that has not been provided in the
  search.

  user interaction is therefore necessary to select the required
  address.

• None: The address searched upon could not be matched to
  any deliverable results in the QuickAddress data. When this match type is
  returned, no address verification is possible and the submitted address should
  be used instead.