Рекомендация n 20 европейской экономической комиссии оон"коды для единиц измерения, используемых в международной торговле" (ece/trade/273) [рус., англ.](принята в г. женеве 26.03.2001 - 29.03.2001 на 7-ой сессии центром по упрощению процедур торговли и электронным деловым операциям)
often referred to as "United States of America customary units" are generally
the same as those of the imperial system; there are, however, some important
exceptions for capacity, length and weight units. Private and official action is
taken in the United States of America to increase the use of SI units.
IX.
CODE STRUCTURE AND PRESENTATION
19. The names of SI, imperial and other
units of measure are standardized as are their symbols. Laws and regulations
affecting foreign trade often make the use of these symbols obligatory when an
abbreviated version of the name of a unit is required.
20. ISO 1000
includes rules for writing SI units and symbols: clause 6.1 is reproduced
below:
"6.1 Unit symbols shall be printed in roman (upright) type
(irrespective of the type used in the rest of the text), shall remain unaltered
in the plural, shall be written without a final full stop (period) except for
normal punctuation, e.g. at the end of a sentence, and shall be placed after the
complete numerical value in the expression for a quantity, leaving a space
between the numerical value and the unit symbol".
Unit symbols shall in
general be written in lower case letters except that the first letter is written
in upper case when the name of the unit is derived from a proper name.
Examples:
m metre
s second
A ampere
Wb weber
21. The following principles for establishing the code list are reflected in the
present Recommendation. Only standard multiples such as mega, giga, shall be
used. Non standard multiples such as 10 mega, 100 mega shall not be coded as
separate units. Numeric values, e.g. 10, 25, are not units of measure. Therefore
they shall not be presented in coded form.
22. The code list is presented
as a table with the following columns:
a) Change indicator
(CI)
Indication of the changes applied with this release of the codes
list.
a plus sign (+) for an addition
a hash sign (#) for
changes to the code name
a vertical bar (|) for changes other than code
name, e.g. level
a letter D (D) temporary indicator, for units not
recommended
(deprecated), pending final decision
before
2001-02-16 by the Bureau International
des
Poids et Mesures BIPM
a letter X (X)
for marked for deletion in this edition
(will not
appear in the next edition)
b) Quantity
The name of the physical
phenomenon being measured.
- In levels 1 and 2 (SI or SI equivalent), the
phenomena pertaining to a certain category are listed under a heading giving the
name of the relevant part in ISO 31.
- In level 3 they are broken down
into the 9 categories as defined in this recommendation.
c) Level /
category
Identification of the normative or informative relevance of the
unit:
level 1 - normative = SI units, standard and commonly used
multiples
level 2 - normative equivalent = SI equivalent units (UK, US,
etc.) and commonly used multiples
level 3 - informative = 9 categories of
units given for information only:
3.1 Qualified base units from levels 1
and 2
3.2 Sales units
3.3 Packing units
3.4 Shipping and
transportation units
3.5 Industry specific units (various)
3.6
Information technology units
3.7 Integers / Numbers / Ratios
3.8
Multiples / Fractions / Decimals
3.9 Miscellaneous (note: some of these
may be repositioned after final review with the affected parties)
These
categories are further sub-divided into sub-categories:
A for
international use
B for regional use with international potential
C regional or sectoral use only
d) Name
The name of the unit of measure
taken from the reference documents
e) Description
A plain text
specification of the named unit of measure, not exceeding 350 characters in
length and in English. It should be noted that such descriptions shall be
progressively introduced for existing entries and where appropriate, shall be
taken from recognized sources. All new entries shall be applied to the code list
with a description
f) Conversion factor
The value used to convert units
to the equivalent SI unit when applicable
g) Representation symbol
The
symbol used to represent the unit of measure as in ISO 31
h) Reference
codes
The corresponding code values as specified in the following source
reference documents:
- Code for units of measure, UN/ECE Recommendation
20, edition 1985
- fixed length (three characters) alphabetic coded
representations;
- fixed length (three characters) numeric coded
representations.
- Code for package type names, UN/ECE Recommendation 21
"Codes for passengers, types of cargo, package and packaging material".
-
fixed length (two characters) alphanumeric coded representations.
Note:
Only those codes considered applicable are included.
- ANSI ASC X12 Code
for unit of measure specified for data element number 355, fixed length (two
characters) alphanumeric coded representations.
i) Common code
This is
the recommended single list of standard codes which is based on the following
conventions:
- The representation format for the code values shall be
alphanumeric variable length 3 characters (an..3); wherever possible, existing
code values are retained according to the following order of precedence for
assigning values:
a) alphabetic code values for units of measure as in
UN/ECE Recommendation 20, edition 1985
b) alphanumeric code values for
units of measure as in ANSI ASC X12 data element number 355
NOTE: Where
there are both UN/ECE Recommendation 20 and ASC X12 data element number 355 code
values for a unit of measure, the UN/ECE Recommendation 20 code value only is
retained.
c) code values for new units of measure shall be allocated by
the UN/ECE Secretariat based on sequential coding according to the format
Alpha-Numeric-Numeric (ann) starting with A01 up to Z99.
j) 3 Annexes with
cross reference number
For ease of use, the code list is presented in three
separate annexes. The cross reference number is provided to facilitate moving
from one annex to another annex.
- Annex I - Code elements listed by
quantity category. The columns represented in this annex are:
- Change
indicator,
- Quantity,
- Level / category,
- Name,
-
Conversion factor,
- Representation symbol,
- Cross reference
number.
- Annex II - Code elements listed by unit of measure name. The
columns represented in this annex are:
- Change indicator,
-
Name,
- Representation symbol,
- Common code,
- Level /
category,
- Cross reference number,
- Description.
- Annex
III - Code elements listed by common code. The columns represented in this annex
are:
- Change indicator,
- Common code,
- Name,
-
Level / category,
- Reference codes,
- Cross reference
number.
X. PROVISION FOR MAINTENANCE
23. This Recommendation shall be
maintained on behalf of UN/CEFACT by the UN/CEFACT Codes Working Group
(CDWG).
24. Proposals for updating this Recommendation should be
addressed to the Trade Facilitation Section, United Nations Economic Commission
for Europe, Palais des Nations, CH-1211 Geneva 10, Switzerland or via e-mail to:
[email protected]
25. Draft revisions to the body text and / or code list
of this Recommendation shall be issued by the CDWG when required and shall be
made available on the CDWG Web page: http://www.unece.org/cefact/
26.
Draft revisions shall be subject to a public comment period of at least two
months. UN/CEFACT Heads of Delegation shall be notified of the availability of a
draft revision and the period for comment. Following the conclusion of the
comment period, the CDWG shall address all comments received. Depending on the
comments received, the CDWG shall issue a new draft revision or shall prepare a
final revision for approval.
27. Final revisions of the body text of this
Recommendation shall be approved by the UN/CEFACT Plenary.
28. Final
revisions of the code list of this Recommendation shall be approved by the CDWG
Plenary or in the case where the body text has also been revised, by the
UN/CEFACT Plenary.
