Appendix — Informative Reference: Measurement Labels
This appendix provides a non-exhaustive reference of commonly used measurement labels that may appear with the unit and system attributes defined by AEON GP Measurement v1.
This list is informative only. AEON GP Measurement v1 does not restrict or validate the values of these attributes.
Schemas, profiles, or processors may define stricter requirements if needed.
Measurement Attributes
unit
Identifies the measurement label.
Example:
distance@{unit="m"} = 3system
Declares the measurement system or standard associated with the unit.
Example:
mass@{unit="oz", system="avoirdupois"} = 12Example Measurement Systems
| System | Description |
|---|---|
metric | International System of Units (SI) |
imperial | British Imperial measurement system |
US-customary | United States customary measurement system |
avoirdupois | weight system used for most everyday mass units |
troy | precious metal weight system |
display | display, screen, and raster coordinate context |
css | CSS layout and styling unit context |
typographic | typography and font-relative measurement context |
print | print and physical output resolution context |
Example Units (non-exhaustive)
Length
| Unit | Typical system |
|---|---|
mm | metric |
cm | metric |
m | metric |
km | metric |
in | imperial / US-customary |
ft | imperial / US-customary |
yd | imperial |
mile | imperial / US-customary |
Example:
length@{unit="cm", system="metric"} = 25Mass
| Unit | Typical system |
|---|---|
g | metric |
kg | metric |
oz | avoirdupois |
lb | avoirdupois |
troy oz | troy |
Example:
weight@{unit="kg", system="metric"} = 82Volume
| Unit | Typical system |
|---|---|
ml | metric |
l | metric |
fl oz | US-customary |
pint | imperial / US-customary |
gallon | imperial / US-customary |
Example:
volume@{unit="ml", system="metric"} = 500Display and Typography
Display-oriented units often depend on a rendering context. For example, px may mean a CSS reference pixel, a raster image pixel, or a device pixel depending on the surrounding profile or schema.
| Unit | Typical system |
|---|---|
px | display / css |
em | css / typographic |
rem | css / typographic |
pt | typographic / print |
pc | typographic / print |
vw | css |
vh | css |
dpi | print / display |
ppi | display |
dppx | css / display |
Examples:
canvasWidth@{unit="px", system="display"} = 1280
fontSize@{unit="rem", system="css"} = 1.25
outputResolution@{unit="dpi", system="print"} = 300When the distinction matters, a schema or profile should define whether px refers to CSS reference pixels, raster pixels, or device pixels.
Precision Example
Precision may be used to indicate measurement resolution.
distance@{unit="m", system="metric", precision=0.01} = 3This indicates the value is measured to centimeter precision.
The attribute does not require rounding or formatting.
Notes
This appendix exists only to illustrate common measurement labels.
It does not:
restrict the
unitattributedefine an official unit registry
require a specific measurement ontology
Profiles or schemas may define stricter unit lists if required.