XML::LibXML::ErrNo(3pm) on Linux
The text abb9be33dcb8, as Debian 9 (Stretch) shipped it.
Structured Errors This module is based on xmlerror.h libxml2 C header file. It defines symbolic constants for all libxml2 error codes. Currently libxml2 uses over 480 different error codes. See also XML::LibXML::Error.