addr:AddressNumber_type

The numeric identifier for a land parcel, house,
building or other feature, as defined by the official
address authority for the given jurisdiction. 1. The
address number is defined as an integer to support
address sorting, parity (even/odd) definition, and
in/out of address range tests. 2. Special care should be
taken with records where the address number is 0 (zero).
Occasionally zero is issued as a valid address number
(e.g. Zero Prince Street, Alexandria, VA 22314) or it
can be imputed (1/2 Fifth Avenue, New York, NY 10003
(for which the address number would be 0 and the suffix
would be "1/2")). More often, though, the address number
is either missing or non-existent, and null value has
been converted to zero. 3. Some addresses may contain
letters, fractions, hyphens, decimals and other
non-integer content within the complete address number.
Those non-integer elements should be placed in the
Address Number Prefix if they appear before the site
number, or in the Address Number Suffix if they follow
the number. 4. The address number must be converted to
text when it is combined with the prefix and suffix into
a complete address number. 5. If necessary, the
Separator can be used to separate the address number
from the prefix or suffix elements in constructing the
complete address number.