att.measurement

att.measurement provides attributes to represent a regularized or normalized measurement.
Module tei — The TEI Infrastructure
Members measure measureGrp unit
Attributes
unit⚓︎ (unit) indicates the units used for the measurement, usually using the standard symbol for the desired units.
Status Optional
Datatype teidata.enumerated
Suggested values include:
m
(metre) SI base unit of length
kg
(kilogram) SI base unit of mass
s
(second) SI base unit of time
Hz
(hertz) SI unit of frequency
Pa
(pascal) SI unit of pressure or stress
Ω
(ohm) SI unit of electric resistance
L
(litre) 1 dm³
t
(tonne) 10³ kg
ha
(hectare) 1 hm²
Å
(ångström) 10⁻¹⁰ m
mL
(millilitre)
cm
(centimetre)
dB
(decibel) see remarks, below
kbit
(kilobit) 10³ or 1000 bits
Kibit
(kibibit) 2¹⁰ or 1024 bits
kB
(kilobyte) 10³ or 1000 bytes
KiB
(kibibyte) 2¹⁰ or 1024 bytes
MB
(megabyte) 10⁶ or 1 000 000 bytes
MiB
(mebibyte) 2²⁰ or 1 048 576 bytes
Note

If the measurement being represented is not expressed in a particular unit, but rather is a number of discrete items, the unit count should be used, or the unit attribute may be left unspecified.

Wherever appropriate, a recognized SI unit name should be used (see further http://www.bipm.org/en/publications/si-brochure/; http://physics.nist.gov/cuu/Units/). The list above is indicative rather than exhaustive.
unitRef⚓︎ points to a unique identifier stored in the xml:id of a unitDef element that defines a unit of measure.
Status Optional
Datatype teidata.pointer
quantity⚓︎ (quantity) specifies the number of the specified units that comprise the measurement
Status Optional
Datatype teidata.numeric
commodity⚓︎ (commodity) indicates the substance that is being measured
Status Optional
Datatype 1–∞ occurrences of teidata.word separated by whitespace
Note

In general, when the commodity is made of discrete entities, the plural form should be used, even when the measurement is of only one of them.
Note
This attribute class provides a triplet of attributes that may be used either to regularize the values of the measurement being encoded, or to normalize them with respect to a standard measurement system.
<l>
<!-- regularization:-->
So weren't you gonna buy <measure quantity="0.5" unit="gal"
  commodity="ice cream">half
   a gallon</measure>, baby
</l>
<l>
<!-- normalization: -->
So won't you go and buy <measure quantity="1.893" unit="L"
  commodity="ice cream">half
   a gallon</measure>, baby?
</l>

These guidelines provide no semantic basis or suggested precedence when both unit and unitRef are provided. For this reason simultaneous use of both is not recommended for interchange unless documentation explaining the use is provided, probably in an ODD customization.

In either case, the unit should normally be named using the standard symbol for an SI unit (see further http://www.bipm.org/en/publications/si-brochure/; http://physics.nist.gov/cuu/Units/). However, encoders may also specify measurements using informally defined units such as lines or characters.