$ sudo apt-get update
$ sudo apt-get install libxml-dom-xpath-perl 

libxml-dom-xpath-perl is installed in your system.

Make ensure the libxml-dom-xpath-perl package were installed using the commands given below,

$ sudo dpkg-query -l | grep libxml-dom-xpath-perl *

You will get with libxml-dom-xpath-perl package name, version, architecture and description in a table

libxml-dom-xpath-perl package basic information: