[Fontconfig] is the use of "patelt" unique to font-config?

[Weiwu Zhang]

Quote from
https://www.freedesktop.org/software/fontconfig/fontconfig-user.html

     <patelt name="property">

     Patelt elements hold a single pattern element and list of
     values. They must have a 'name' attribute which indicates the
     pattern element name.  Patelt elements include int, double,
     string, matrix, bool, charset and const elements.

I have never seen this English word before, not to mention its use as
a list of possible values for a property to match. Is this innovative
use of Patelt part of XML vocabulary somewhere or purely originated in
font-config?

Thanks!