Khronos public bugtracker – Bug 80
Last modified: 2014-01-07 10:23:09 PST
In the schema (http://www.khronos.org/files/collada_schema_1_4), "light_linear_attenutation" appears instead of "light_linear_attenuation" (has an extra t).
still in version 1.5.0, so updated report.
A typo in an element name is effectively a backward compatibility problem. I think a <xs:choice> has to be introduced in order to resolve it in 1.4.X at some point.