docbook error

[CCSR <ccsr@dmu.ac.uk>]

hi,

I am tryig to compile xml files through jade and  i am getting the 
following error messages: -

barroso_p_hidec.xml:3:59:E: could not get 
"/docbook/xml/4.2CR1/docbookx.dtd " from "www.oasis-open.org" (reason 
given was "Not Found")

barroso_p_hidec.xml:3:59:E: DTD did not contain element declaration 
for document type name

barroso_p_hidec.xml:4:8:E: element "article" undefined

barroso_p_hidec.xml:5:13:E: element "articleinfo" undefined

i have check the mailing lists and no one has came across a similar 
problem so i needed guidance on what has gone wrong. i have checked the 
files if they contain the right path for docbook.dtd

this was occured first when i tried compiling a new created xml file and 
then after it shows this message for every other file that i try to 
compile.



-- 
Regards
Krutant Dave
CCSR Webmaster
-------------------------------------------------------------------------
Centre for Computing and Social Responsibility | Email:ccsr@dmu.ac.uk
Faculty of Computing Sciences and Engineering  | Tel: +44 116 250 6143
De Montfort University                         | Visit our website on:
The Gateway, LEICESTER, UK, LE1 9BH            | www.ccsr.cse.dmu.ac.uk/
-------------------------------------------------------------------------