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/usr/share/vim/vim73/compiler/xmllint.vim is in vim-runtime 2:7.3.429-2ubuntu2.

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The actual contents of the file can be viewed below.

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" Vim compiler file
" Compiler:	xmllint
" Maintainer:	Doug Kearns <djkea2@gus.gscit.monash.edu.au>
" URL:		http://gus.gscit.monash.edu.au/~djkea2/vim/compiler/xmllint.vim
" Last Change:	2004 Nov 27

if exists("current_compiler")
  finish
endif
let current_compiler = "xmllint"

if exists(":CompilerSet") != 2		" older Vim always used :setlocal
  command -nargs=* CompilerSet setlocal <args>
endif

let s:cpo_save = &cpo
set cpo-=C

CompilerSet makeprg=xmllint\ --valid\ --noout\ 

CompilerSet errorformat=%E%f:%l:\ error:\ %m,
		    \%W%f:%l:\ warning:\ %m,
		    \%E%f:%l:\ validity\ error:\ %m,
		    \%W%f:%l:\ validity\ warning:\ %m,
		    \%-Z%p^,
		    \%-G%.%#

let &cpo = s:cpo_save
unlet s:cpo_save