I am trying to write a script which append and edit the pre-exist xml file, I have got the config.ini file where user can update the changes they want in xml file, and what my script suppose to do is following task,
- read the ID and SOURCE from config file into hash
- open the XML file and search for the matching ID
- compare the source if they are same or different
- if different implement the changes

the problem I am facing is the structure of my config file is bit complex, as following,
[RESOURCE]
Id="res.wacgen"
Source="INTERNAL"> ($ENV{wacgen} ? $ENV{wacgen} : $ENV{APPL})
Id="res.wacgenlib"
Source="INTERNAL"> ($ENV{wacgenlib} ? $ENV{wacgenlib} : $ENV{APPL}.$slash.'all.4gs')
Id="res.waclibext"
Source="INTERNAL"> ($ENV{waclibext} ? $ENV{waclibext} : '4gs')
[UNX]
Id="res.dvm.wa"
Source="INTERNAL">$(res.fgldir)/bin/$(res.fglrun)
Id="res.fgldir"
Source="INTERNAL">$ENV{FGLDIR}
Id="res.path"
[SERVICE_APPLICATION_EXECUTION_COMPONENT]
Id="APPL"
>$(res.appl)
Id="DBCENTURY"
>$(res.dbcentury)
Id="DBDATE"
>$(res.dbdate)

So, I am not looking forward for any suggestion How I can implement this into code?
I found perl module XPATH but as I am naïve I couldn’t think of how can I work it out.
Any suggestion welcome!!!

Regards