/usr/lib/pd/extra/pdp/pdp_tag.pd is in pd-pdp 1:0.14.1-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #N canvas 700 231 450 300 10;
#X obj 56 25 inlet;
#X obj 55 191 outlet;
#X msg 162 174 \$1 \$2 \$3 \$4;
#X text 148 31 tag a pdp message (for routing);
#X obj 0 110 symbol \$1;
#X obj 56 68 unpack s s 0;
#X obj 55 139 pack s s s 0;
#X obj 39 91 t b s;
#X obj 55 165 route list;
#X connect 0 0 5 0;
#X connect 4 0 6 0;
#X connect 5 0 7 0;
#X connect 5 1 6 2;
#X connect 5 2 6 3;
#X connect 6 0 8 0;
#X connect 7 0 4 0;
#X connect 7 1 6 1;
#X connect 8 0 1 0;
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