tnc(3tcl) on Linux

The text bdc0b83a7474, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it.

tnc is an expat parser object extension, that validates the XML stream against the document DTD while parsing.