6.3.3 Syntax Reference Identifier

Table 35 defines the identifiers for each Syntax Reference.

Table 35 – List of Syntax Reference Identifiers

Common Name

Identifier

UCUM

QuantityType instances:

The UCUM Syntax ReferenceID for quantities shall include the prefix “quantityKind:” followed by the name of the quantity.

UnitType instances:

The UCUM SyntaxReferenceId for units shall include an expression based on the UCUM syntax making use of the symbols named in the “C/S” entry of the UCUM spec (https://ucum.org/ucum.html).

Codes (expressions) for common units are defined in Annex B.

QUDT

QuantityType instances:

The QUDT Syntax ReferenceID for quantities shall include the prefix “quantityKind:” followed by the name of the quantity as in https://www.qudt.org/doc/DOC_VOCAB-QUANTITY-KINDS.html.

A few examples:

QUDT code

Symbol

Name

quantitykind:Length

l

length

quantitykind:LinearThermalExpansion

m/K

linear thermal expansion

UnitType instances:

The QUDT Syntax ReferenceID for units shall include the prefix “unit:” followed by the name of the unit as in https://www.qudt.org/doc/DOC_VOCAB-UNITS.html.

.

A few examples:

QUDT code

Symbol

Name

unit:M

m

metre

unit:CentiM

cm

centimetre

unit:MI_N

n mile

nautical mile

unit:ANGSTROM

Å

angstrom

unit:MicroM-PER-K

µm/K

micrometre per kelvin

unit:FATH

fath

fathom

IEC CDD

QuantityType instances:

The IEC CDD SyntaxReferenceId shall include the IRDI of the respective quantity.

A few examples:

IRDI

Symbol

Name

0112/2///62720#UAD002#001

---

acceleration

0112/2///62720#UAD107#001

---

mass flow rate

UnitType instances:

The IEC CDD SyntaxReferenceId shall include the IRDI of the respective unit.

A few examples:

IRDI

Symbol

Name

0112/2///62720#UAB044#001

in/s²

inch per second squared

0112/2///62720#UAA497#001

g/s

gram per second

UNECE

QuantityType instances:

There are no UNECE Syntax References for quantities.

UnitType instances:

The UNECE SyntaxReferenceId shall include the common code from “Codes for Units of Measurement” published by the “United Nations Centre for Trade Facilitation and Electronic Business” (see https://www.unece.org/cefact/codesfortrade/codes_index.html).

A few examples:

UNECE code

Symbol

Name

MTR

m

metre

CMT

cm

centimetre

NMI

n mile

nautical mile

A11

Å

angstrom

F50

µm/K

micrometre per kelvin

AK

fth

fathom

INH

in

inch

L98

yd/°F

yard per degree Fahrenheit

M51

ft (US survey)

foot (U.S. survey)

MTK

m²

square metre

ACR

acre

acre

MTQ

m³

cubic metre

LTR

l

litre

LATEX_SIUNITX

QuantityType instances:

There are no LATEX_SIUNITX Syntax References for quantities.

UnitType instances:

The LATEX_SIUNITX SyntaxReferenceId shall include the leading slash, the keyword of the macro as well as the entire argument.

A few examples:

LATEX_SIUNITX code

Symbol

Name

\unit{m}

m

metre

\unit{\centi\meter}

cm

centimetre

\unit{\nauticalmile}

n mile

nautical mile

\unit{\ångström}

Å

angstrom

\unit{\micro\meter\per\kelvin}

µm/K

micrometre per kelvin