C-DIT DCA Reference Questions and Answers – Html & Internet
Difference Between Html & XML
XML was designed to transport and store data.
HTML was designed to display data.
XML stands for EXtensible Markup Language
XML is a markup language much like HTML
XML was designed to carry data, not to display data
XML tags are not predefined. You must define your own tags
XML is designed to be self-descriptive
XML is a W3C Recommendation
XML is not a replacement for HTML.
XML and HTML were designed with different goals:
XML was designed to transport and store data, with focus on what data is
HTML was designed to display data, with focus on how data looks
HTML is about displaying information, while XML is about carrying information.
Maybe it is a little hard to understand, but XML does not DO anything. XML was created to structure, store, and transport information.
The following example is a note to Tove, from Jani, stored as XML:
Don’t forget me this weekend!
The note above is quite self descriptive. It has sender and receiver information, it also has a heading and a message body.
But still, this XML document does not DO anything. It is just information wrapped in tags. Someone must write a piece of software to send, receive or display it.
With XML You Invent Your Own Tags
The tags in the example above (like and ) are not defined in any XML standard. These tags are “invented” by the author of the XML document.
That is because the XML language has no predefined tags.
The tags used in HTML are predefined. HTML documents can only use tags defined in the HTML standard (like
XML allows the author to define his/her own tags and his/her own document structure.
XML is Not a Replacement for HTML
XML is a complement to HTML.
It is important to understand that XML is not a replacement for HTML. In most web applications, XML is used to transport data, while HTML is used to format and display the data.
My best description of XML is this:
XML is a software- and hardware-independent tool for carrying information.
XML is a W3C Recommendation
XML became a W3C Recommendation on February 10, 1998.
XML is now as important for the Web as HTML was to the foundation of the Web.
XML is the most common tool for data transmissions between all sorts of applications.
Html Tags Description DTD
Defines a comment STF
Defines the document type STF
Defines an abbreviation STF
Defines an acronym STF
Defines contact information for the author/owner of a document STF
Deprecated. Defines an embedded applet TF
Defines an area inside an image-map STF
Defines bold text STF
Defines a default address or a default target for all links on a page STF
Deprecated. Defines a default font, color, or size for the text in a page TF
Defines the text direction STF
Defines big text STF
Defines a long quotation STF
Defines the document’s body STF
Defines a single line break STF
Defines a push button STF
Deprecated. Defines centered text TF
Defines a citation STF
Defines computer code text STF
Defines a group of columns in a table for formatting STF
<del> Defines deleted text STF
Defines a definition term STF
Deprecated. Defines a directory list TF
Defines a section in a document STF
- Defines a definition list STF
Defines emphasized text STF
Defines a border around elements in a form STF
Deprecated. Defines font, color, and size for text TF
Defines an HTML form for user input STF
Defines a window (a frame) in a frameset F
Defines a set of frames F
Defines HTML headings STF
Defines information about the document STF
Defines a horizontal line STF
Defines an HTML document STF
Defines italic text STF
Defines an inline frame TF
Defines an image STF
Defines an input control STF
Defines keyboard text STF
Defines a label for an input element STF
Defines a caption for a fieldset element STF
Defines the relationship between a document and an external resource STF
Deprecated. Defines a menu list TF
Defines metadata about an HTML document STF
Defines an alternate content for users that do not support frames TF
Defines an alternate content for users that do not support client-side scripts STF
Defines an embedded object STF
- Defines an ordered list STF
Defines a group of related options in a select list STF
Defines an option in a select list STF
Defines a paragraph STF
Defines a parameter for an object STF