Web Design in a Nutshell, 3rd Edition

DTD Syntax

The following example is made up of lines taken from the XHTML Strict DTD (the full DTD is over 1,500 lines long). It contains samples of element , attlist (attribute), and entity declarations.

<!ELEMENT title (#PCDATA 
)>
<!ELEMENT meta EMPTY>
<!ELEMENT ul (li)+>

<!ENTITY % i18n
 "lang        %LanguageCode; #IMPLIED
  xml:lang    %LanguageCode; #IMPLIED
  dir         (ltr|rtl)      #IMPLIED"
  >

<!ATTLIST title
  %i18n;
  id          ID             #IMPLIED
  >

<!ATTLIST meta
  %i18n;
  id          ID             #IMPLIED
  http-equiv  CDATA          #IMPLIED
  name        CDATA          #IMPLIED
  content     CDATA          #REQUIRED
  scheme      CDATA          #IMPLIED
  >