Grouping With Parentheses

<!ELEMENT dl (dt, dd)*>
<!ELEMENT ARTICLE (TITLE, (P | PHOTO | GRAPH | SIDEBAR | PULLQUOTE | SUBHEAD)*, BYLINE?)>

<ELEMENT catalog (category, cataloging_info, last_updated, 
   copyright, maintainer, (composer | composition)*)>

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Copyright 2000, 2001 Elliotte Rusty Harold
elharo@metalab.unc.edu
Last Modified October 30, 2000