Element Declarations

• Quantity indicators can also be used.

  • ‘?’ indicates an element is optional or cannot repeat
  • ‘+’ indicates an element is required and may repeat
  • ‘*’ indicates an element is optional, and also repeatable

• Document text is indicated by the keyword PCDATA (Parsable Character Data)<!ELEMENT emph (#PCDATA|sub|super)*><!ELEMENT sub (#PCDATA)><!ELEMENT super (#PCDATA)><emph>H<subɮ</subɬ is water.</emph>

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