I am not sure where to add that line to my code.

I have looked at the code again and I think the problem is in the subroutine which is trying to parse the entry against the DTD, rather than the code finding additional errors. The DTD checking sub routine is:

sub get_dtd_errors {
    my $elt = shift;

    use XML::LibXML;

    my $parser = XML::LibXML->new();
    $parser->validation(1); # switches DTD validation on
    my $tag = $elt->tag;


    my $element = &get_xml_prolog($tag) . $elt->sprint;

    if ( $element =~ m/<Entry[^>]*? e:id="(.*?)"/ ) { $element_id = $1
+; }

#    warn "Processing:\n\t$element";

### remove non-DTD tagging
    $element =~ s/ (e:.*?|xmlns|xmlns:e|xml:space)=".*?"//g; # remove 
+EE attributes
    $element =~ s/ (refentry|refid|rel|style)=".*?"//g; # remove xref 
+attributes
    $element =~ s/ (lid)=".*?"//g; # remove 'lid' attributes
    $element =~ s/<\/?e:TEXT[^>]*?>//g; # remove EE tags
    $element =~ s/<\/?e:INTER[^>]*?>//g;


    eval { my $doc = $parser->parse_string($element) };
    if (my $err = $@) {
        my @err = split /\n/, $err;
        my $last = pop(@err);
        my $modulo3 = 0;
        my $skip = 0; # allows us to ignore certain messages

        my $vfSectLoose = 0;

        foreach my $line (@err) {
        if ($line =~ m/vfSectLoose/ ) {$vfSectLoose = 1;}
        }

        foreach $line (@err) {
### Each error comes in three lines: the message, the text fragment co
+ntaining the error, and a pointer
### we format the different lines in slightly different ways
            if ( $modulo3 == 0 ) {

#               if ( $line =~ m/No declaration for attribute wotd of e
+lement Entry/ ) { $skip = 1; }
                 if ( !$skip ) {
                    $line =~ s/^\:\d+\: //;
                    $line = "<li>" . $line . "\n<p>\n";
                    $dtd_errors++;
                }
            }
            if ( $modulo3 == 1 && !$skip)  {
                $line =~ s/</&lt;/g;
                $line =~ s/>/&gt;/g;

                $line = "<pre>" . $line . "</pre>\n";
            }
            if ( $modulo3 == 2 && !$skip ) {
                $line =~ s/ /-/g;
                $line = "<pre>" . $line . "</pre></p></li>\n";
            }

            $dtd_error_page .= $line unless $skip;
            $modulo3++;
            if  ( $modulo3 == 3 ) {
                $modulo3 = 0 ;
                $skip = 0; # reset skip
            }
        }

    }
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