Skip to main content

Doctype Defination

By
A Document Type Declaration, or DOCTYPE, is an instruction that associates a particular SGML or XML document (for example, a webpage) with a Document Type Definition (DTD).

Syntax

The general syntax for a document type declaration is:

<!DOCTYPE root-element PUBLIC "FPI" ["URI"] [
<!-- internal subset declarations -->
]>



or

<!DOCTYPE root-element SYSTEM "URI" [
<!-- internal subset declarations -->
]>

Example

The first line of many World Wide Web pages reads as follows:

<!DOCTYPE html PUBLIC
  "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="ar" dir="rtl" xmlns="http://www.w3.org/1999/xhtml">


HTML 4.01 DTDs

Strict DTD does not allow presentational markup with the argument that Cascading Style Sheets should be used for that instead. This is how the Strict DTD looks:

 <!DOCTYPE HTML
     PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
 <html>


Transitional DTD allows some older PUBLIC and attributes that have been deprecated:

 <!DOCTYPE HTML
    PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>


If frames are used, the Frameset DTD must be used instead, like this:

 <!DOCTYPE HTML
     PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">
 <html>


XHTML 1.0 DTDs
XHTML's DTDs are also Strict, Transitional and Frameset.

XHTML Strict DTD. No deprecated tags are supported and the code must be written correctly.

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE html
     PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">



XHTML Transitional DTD is like the XHTML Strict DTD, but deprecated tags are allowed.

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE html
     PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">



XHTML Frameset DTD is the only XHTML DTD that supports Frameset. The DTD is below.

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE html
     PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

XHTML 1.1 DTD

XHTML 1.1 is the most current finalized revision of XHTML, introducing support for XHTML Modularization. XHTML 1.1 has the stringency of XHTML 1.0 Strict.

<!DOCTYPE html PUBLIC
  "-//W3C//DTD XHTML 1.1//EN"
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">


XHTML Basic DTDs

XHTML Basic 1.0

<!DOCTYPE html PUBLIC
  "-//W3C//DTD XHTML Basic 1.0//EN"
  "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">

XHTML Basic 1.1

<!DOCTYPE html PUBLIC
  "-//W3C//DTD XHTML Basic 1.1//EN"
  "http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">

XHTML Mobile Profile DTDs

XHTML Mobile Profile 1.0

<!DOCTYPE html PUBLIC
  "-//WAPFORUM//DTD XHTML Mobile 1.0//EN"
  "http://www.wapforum.org/DTD/xhtml-mobile10.dtd">

XHTML Mobile Profile 1.1

<!DOCTYPE html PUBLIC
  "-//WAPFORUM//DTD XHTML Mobile 1.1//EN"
  "http://www.openmobilealliance.org/tech/DTD/xhtml-mobile11.dtd">

XHTML Mobile Profile 1.2

<!DOCTYPE html PUBLIC
  "-//WAPFORUM//DTD XHTML Mobile 1.2//EN"
  "http://www.openmobilealliance.org/tech/DTD/xhtml-mobile12.dtd">



Labels:

Comments

Post a Comment

Popular posts from this blog

MySQL Connection

By
Connection with MySQL Database Before accessing database, you must create a connection to the database Syntax: mysql_connect(servername,username,password); where, servername specifies the server to connect to. Default value is “localhost” username specifies the username to log in with. Default value is the name of the user that owns the server process. To connect offline we use username “root”. password specifies the password to log in with. Default is “” Code : Creating connection to the database and selecting the required database <?php $con = mysql_connect(“localhost”,”root”,”"); if (!$con) { die(‘Could not connect: ‘ . mysql_error()); } else{ mysql_select_db(“test”, $con) }; ?> Here, we have store connection in a variable called $con and trap error using die function. Closing connection The connection will be closed automatically when the script ends. To close the connection before, use the mysql_close() function: <?php $con = mysql_conne
Post a Comment
Read more

Type Juggling and Type Casting

By
Type Juggling: PHP does not require (or support) explicit type definition in variable declaration; a variable's type is determined by the context in which the variable is used. That is to say, if a string value is assigned to variable $var, $var becomes a string. If an integer value is then assigned to $var, it becomes an integer.
2 comments
Read more