Grouping With Parentheses

• Parentheses combine several elements into a single element.

• Parenthesized element can be nested inside other parentheses in place of a single element.

• The parenthesized element can be suffixed with a plus sign, a comma, or a question mark.

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

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