<secfol>The word or words that a cataloguer, typically medieval but possibly modern as well, might take from a fixed point in all the codices he is describing (the beginning of the second leaf, the beginning of the second column, the beginning of the penultimate leaf, the end of the penultimate leaf, and so on) in order to provide a unique identifier to the particular codex.
<secFol>(con-)versio morum</secFol>
<!ELEMENT secfol - - (%phrase.seq;)>

<!ATTLIST secfol - - %a.global; >
See further2.2.5. Catchwords, signatures, secundo folio

Appendix A Reference Documentation for Elements and Classes