New to xml, simple communication

Hi there
I'm new to xml and as a uni project i've been asked to get two independent programs to communicate via xml. Specifically i am looking to exchange data contained in the databases maintained by each program.
I would be very gratefull for any help or direction towards implementing this client/server based problem
many thanks
Joseph

So, is your question "How do I read and write XML files" or is it "How do I communicate between two systems"? Either of those are really too vague to be answered on a forum, but the combination of both is hopeless.

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I installed this on my linux mint machine in no time but for some reason the simple task had turned onto a project on the Mac.
I found an old posting for setting up the CPAN modules on Mac but I haven't been able to applied to my environment.
-------   this is the old post ---------------
Two of my friends today asked me to help them get XML::Simple working on their Mac's. Somthing that should be a simple cpan one-liner "install XML::Simple" doesnt work on OSX. It took me a half hour to figure all this out... here are the steps:
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- A reasonable working knowledge of Perl and Unix
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Step 2:
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Back to cpan to finish the install
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-------- end of old post ---------------------
This is where I have gotten so far:
to get in CPAN I use sudo cpan <enter>
cpan[6]> cpan[6]> install XML::Simple
Going to read '/Users/josephhandschu/.cpan/sources/authors/01mailrc.txt.gz'
............................................................................DONE
Going to read '/Users/josephhandschu/.cpan/sources/modules/02packages.details.txt.gz'
Database was generated on Mon, 13 Feb 2012 00:12:32 GMT
New CPAN.pm version (v1.9800) available.
[Currently running version is v1.9456]
You might want to try
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    reload cpan
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the current session.
..............................................................DONE
Going to read '/Users/josephhandschu/.cpan/sources/modules/03modlist.data.gz'
............................................................................DONE
Going to write /Users/josephhandschu/.cpan/Metadata
XML::Simple is up to date (2.18).
Then I get out of CPAN
cpan[11]> exit
Terminal does not support GetHistory.
Lockfile removed.
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Try to run the Makefile.PL
Josephs-MacBook-Air-2:XML-Parser-2.41-2ew4TC josephhandschu$ perl Makefile.PL EXPATLIBPATH=/usr/X11R6/lib EXPATINCPATH=/usr/X11/include
Couldn't find your C compiler
Compilation failed in require at Makefile.PL line 5.
BEGIN failed--compilation aborted at Makefile.PL line 5.
Josephs-MacBook-Air-2:XML-Parser-2.41-2ew4TC josephhandschu$
or with a shorter version taking the default parameters
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Couldn't find your C compiler
Compilation failed in require at Makefile.PL line 5.
BEGIN failed--compilation aborted at Makefile.PL line 5.
But this complains about not finding the C compiler
Any ideas?
Suggestions are greatly appreciated, I've hitted a wall....
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Two of my friends today asked me to help them get XML::Simple working on their Mac's. Somthing that should be a simple cpan one-liner "install XML::Simple" doesnt work on OSX. It took me a half hour to figure all this out... here are the steps:
Prerequisites:
- X11 1.1.3 package from the OSX install disk (or Apple download site)
- Perl 5.8.x w/cpan (default on OSX)
- a terminal
- A reasonable working knowledge of Perl and Unix
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Open terminal, type 'cpan' to enter the cpan installer.
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Step 2:
cpan> exit
$ cd ~/.cpan/build/XML-Parser-2.34 **Note the version may change
$ perl Makefile.PL EXPATLIBPATH=/usr/X11R6/lib EXPATINCPATH=/usr/X11R6/include
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$ make install
Step 3:
Back to cpan...
$ cpan
cpan> install XML::Parser
Already Installed
cpan> install XML::Parser::Expat
Already Installed
cpan> install XML::SAX::Expat
Installs with some silly warning about ParserDetails.ini. Lets fix that.
cpan> exit
Step 4:
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Macbook Pro 15" C2D Mac OS X (10.4.8)

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