<!ENTITY % name type>

exp.:	<!ENTITY % boolean "(true|false)">
	<!ENTITY % media "video | audio"> <!ENTITY % property "%media; | output">

<!ENTITY name attributes_list>

exp. :

<!ENTITY % uri "CDATA"> <!ENTITY % next.attrs                "next %uri; #IMPLIED                 method (get|post) 'get'                 expr CDATA #IMPLIED">

<!ELEMENT name type>

exp.:

<!ELEMENT tutorial (example+ | #PCDATA)>

<!ELEMENT name EMPTY>

exp.:

<!ELEMENT property EMPTY>

<!ATTLIST element name type value>

exp.:	<!ATTLIST attributes aaa CDATA #REQUIRED>
	<!ATTLIST attributes                aaa CDATA #REQUIRED                bbb CDATA #IMPLIED>

<!ATTLIST element nom enumeration value>

exp.:

<!ATTLIST AAA true (yes|no) #REQUIRED>

<!ATTLIST element name enumeration default_value>

exp.:

<!ATTLIST AAA true (yes|no) "yes">

<!ATTLIST element name type default_value>

exp.:

<!ATTLIST BBB month NMTOKEN "1">

<!ATTLIST element name type #FIXED implied_value>

exp.:

<!ATTLIST form method CDATA #FIXED "SEND">

<?language_name ... ?>

exp.:

<?php print 'This is the PHP version '.phpversion(); ?>