in reply to xml to csv

You've encountered the silly "each XML document must have one and only one root tag" restriction. Let's see what do the XML::Rules docs say about that:

If you need to parse a XML file without the top-most tag (something that each and any sane person would allow, but the XML comitee did not), you can parse 
  <!DOCTYPE doc [<!ENTITY real_doc SYSTEM "$the_file_name">]><doc>&rea
+l_doc;</doc>

[download]
instead.

And the 

map {$_[1]->{$_}} qw( 
  Subject Course Title Description Prequisites Corequisites Requisites
  LectureHours LaboratoryHours CreditHours Flags 
)

[download]
is better written 
@{$_[1]}{qw( 
  Subject Course Title Description Prequisites Corequisites Requisites
  LectureHours LaboratoryHours CreditHours Flags 
)}

[download]
No need to map(), just slice the hash.

You may also want to add the stripspaces => 3 to ensure the whitespace around the <Class> tags is not being accumulated in the $_[1]->{_content} for the handler of the root tag.

Jenda
Enoch was right!
Enjoy the last years of Rome.

Replies are listed 'Best First'.
Re^2: xml to csv
by Anonymous Monk on Nov 04, 2009 at 14:43 UTC 
    #!/usr/bin/perl --

use warnings;
use strict;

use XML::Rules;
use Text::CSV_XS;

Main(@ARGV);
exit(0);

sub Main {
  use autodie;
  open my $File, shift || 'alpha31.xml';
  RuleCvs( $File, \*STDOUT );

#~ use FileHandle;
#~   RuleCvs( FileHandle->new(shift // 'alpha31.xml'), \*STDOUT ); use
+ 5.10.0;
#~   RuleCvs( FileHandle->new(shift || 'alpha31.xml'), \*STDOUT );
#~   RuleCvs( FileHandle->new(shift), \*STDOUT );

} ## end sub Main

BEGIN {
  my (@Heads) = qw(
    Subject
    Course
    Title
    Description
    Prequisites
    Corequisites
    Requisites
    LectureHours
    LaboratoryHours
    CreditHours
    Flags
  );

  sub RuleCvs {
    my ( $InFh, $OutFh ) = @_;
    my $csv = Text::CSV_XS->new( { eol => "\n" } );
    my $parser = XML::Rules->new(
      rules => [
        _default => 'content',
        Class    => sub {
          $csv->print( $_[4]->{parameters}, [ @{ $_[1] }{@Heads} ] );
          return;
          }
      ]
    );

    print $OutFh join( ',', @Heads ), "\n";
    $parser->parse( $InFh, $OutFh );

    return;
  } ## end sub RuleCvs
} ## end BEGIN
__END__

    [download]
[reply]
[d/l]

In Section Seekers of Perl Wisdom