/usr/share/xml/udunits/udunits2-base.xml is in libudunits2-0 2.2.17-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
Copyright 2008, 2009 University Corporation for Atmospheric Research
This file is part of the UDUNITS-2 package. See the file COPYRIGHT
in the top-level source-directory of the package for copying and
redistribution conditions.
SI base units.
-->
<unit-system>
<unit>
<!--
The meter is the length of the path travelled by light in vacuum
during a time interval of 1/299 792 458 of a second.
-->
<base/>
<name><singular>meter</singular></name>
<symbol>m</symbol>
<aliases> <name><singular>metre</singular></name> </aliases>
</unit>
<unit>
<!-- The kilogram is the unit of mass; it is equal to the mass of the
international prototype of the kilogram. -->
<base/>
<name><singular>kilogram</singular></name>
<symbol>kg</symbol>
</unit>
<unit>
<!--
The second is the duration of 9 192 631 770 periods of the
radiation corresponding to the transition between the two hyperfine
levels of the ground state of the cesium 133 atom.
-->
<base/>
<name><singular>second</singular></name>
<symbol>s</symbol>
</unit>
<unit>
<!--
The ampere is that constant current which, if maintained in two
straight parallel conductors of infinite length, of negligible
circular cross-section, and placed 1 meter apart in vacuum, would
produce between these conductors a force equal to 2e-7 newton
per meter of length.
-->
<base/>
<name><singular>ampere</singular></name>
<symbol>A</symbol>
</unit>
<unit>
<!--
The kelvin, unit of thermodynamic temperature, is the fraction
1/273.16 of the thermodynamic temperature of the triple point of
water.
-->
<base/>
<name><singular>kelvin</singular></name>
<symbol>K</symbol>
</unit>
<unit>
<!--
1. The mole is the amount of substance of a system which contains
as many elementary entities as there are atoms in 0.012 kilogram of
carbon 12.
2. When the mole is used, the elementary entities must be specified
and may be atoms, molecules, ions, electrons, other particles, or
specified groups of such particles.
-->
<base/>
<name><singular>mole</singular></name>
<symbol>mol</symbol>
</unit>
<unit>
<!--
The candela is the luminous intensity, in a given direction, of a
source that emits monochromatic radiation of frequency 540e12
hertz and that has a radiant intensity in that direction of 1/683
watt per steradian.
-->
<base/>
<name><singular>candela</singular></name>
<symbol>cd</symbol>
</unit>
</unit-system>
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