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              $self->_error( "Missing entries from mandatory list" );
          }
      }
  
      for my $value (@$data) {
          push @{$self->{stack}}, $value || "<undef>";
          if(defined $spec->{value}) {
              $spec->{value}->($self,'list',$value);
          } elsif(defined $spec->{'map'}) {
              $self->check_map($spec->{'map'},$value);
          } elsif(defined $spec->{'list'}) {
              $self->check_list($spec->{'list'},$value);
          } elsif(defined $spec->{'lazylist'}) {
              $self->check_lazylist($spec->{'lazylist'},$value);
          } elsif ($spec->{':key'}) {
              $self->check_map($spec,$value);
          } else {
            $self->_error( "$spec_error associated with '$self->{stack}[-2]'" );
          }
          pop @{$self->{stack}};
      }
  }
  
  
  sub header {
      my ($self,$key,$value) = @_;
      if(defined $value) {
          return 1    if($value && $value =~ /^--- #YAML:1.0/);
      }
      $self->_error( "file does not have a valid YAML header." );
      return 0;
  }
  
  sub release_status {
    my ($self,$key,$value) = @_;
    if(defined $value) {
      my $version = $self->{data}{version} || '';
      if ( $version =~ /_/ ) {
        return 1 if ( $value =~ /\A(?:testing|unstable)\z/ );
        $self->_error( "'$value' for '$key' is invalid for version '$version'" );
      }
      else {
        return 1 if ( $value =~ /\A(?:stable|testing|unstable)\z/ );
        $self->_error( "'$value' for '$key' is invalid" );
      }
    }
    else {
      $self->_error( "'$key' is not defined" );
    }
    return 0;
  }
  
  # _uri_split taken from URI::Split by Gisle Aas, Copyright 2003
  sub _uri_split {
       return $_[0] =~ m,(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?,;
  }
  
  sub url {
      my ($self,$key,$value) = @_;
      if(defined $value) {
        my ($scheme, $auth, $path, $query, $frag) = _uri_split($value);
        unless ( defined $scheme && length $scheme ) {
          $self->_error( "'$value' for '$key' does not have a URL scheme" );
          return 0;
        }
        unless ( defined $auth && length $auth ) {
          $self->_error( "'$value' for '$key' does not have a URL authority" );
          return 0;
        }
        return 1;
      }
      $value ||= '';
      $self->_error( "'$value' for '$key' is not a valid URL." );
      return 0;
  }
  
  sub urlspec {
      my ($self,$key,$value) = @_;
      if(defined $value) {
          return 1    if($value && $known_specs{$self->{spec}} eq $value);
          if($value && $known_urls{$value}) {
              $self->_error( 'META specification URL does not match version' );
              return 0;
          }
      }
      $self->_error( 'Unknown META specification' );
      return 0;
  }
  
  sub anything { return 1 }
  
  sub string {
      my ($self,$key,$value) = @_;
      if(defined $value) {
          return 1    if($value || $value =~ /^0$/);
      }
      $self->_error( "value is an undefined string" );
      return 0;
  }
  
  sub string_or_undef {
      my ($self,$key,$value) = @_;
      return 1    unless(defined $value);
      return 1    if($value || $value =~ /^0$/);
      $self->_error( "No string defined for '$key'" );
      return 0;
  }
  
  sub file {
      my ($self,$key,$value) = @_;
      return 1    if(defined $value);
      $self->_error( "No file defined for '$key'" );
      return 0;
  }
  
  sub exversion {
      my ($self,$key,$value) = @_;
      if(defined $value && ($value || $value =~ /0/)) {
          my $pass = 1;
          for(split(",",$value)) { $self->version($key,$_) or ($pass = 0); }
          return $pass;