HEADING DECLARATION

<!ELEMENT    name    (content-model)>
          |             |                     |
        \/            \/                    \/
        keyword       tag name                   formal definition of element's
                             to be known by         allowed content

#PCDATA in Models (first, OR bars, asterisk)
(PCDATA)

(#PCDATA           |          elem1               |        elem2 )         *
           |              VBar          |               VBar         |                |
     keyword                  element name          element name   always include *

ANY Element Keyword

<! ELEMENT       name            ANY   >
         |                |                      |
 keyword    tag name to   keyword ANY
                    be known by

EMPTY Element Keyword

<!ELEMENT       name                 EMPTY  >
         |                |                         |
 keyword   tag name to be    keyword EMPTY
                  known by

Attribute Declaration

<!ATTLIST      element               name                        declvalue     default >
        |                |                          |                                 |              |
keyword   name of the        name of attribute  |        keyword or default value
                 associated                           what kind of value(s)
                  element