The sequential number of the conference
Ideally, this element would contain only the numeric portion of the number without any suffixes or other text. For example, “The 19th XML/SGML Conference” should be tagged as <conf-num>19</conf-num> with the th dropped.
<!ELEMENT conf-num (#PCDATA %conf-num-elements;)* >
Text, numbers, or special characters, zero or more
... <article-meta> ... <abstract>...</abstract> <conference> <conf-date>1999</conf-date> <conf-name>The 27th annual ACM SI/GUCCS conference</conf-name> <conf-acronym>SIGUCCS</conf-acronym> <conf-num>27</conf-num> <conf-loc>Denver, Colorado, United States</conf-loc> <conf-sponsor>ACM, Assoc. for Computing Machinery</conf-sponsor> <conf-theme>User services conference for university and college computing service organizations</conf-theme> </conference> </article-meta> ...