If you are already know HTML then the XML syntax shouldn't be that much of a leap to grasp.
While there are a some new items in XML, it is still just a markup language that relies on tags to get the job done.
XML Document:-
XML documents use a simple syntax and self-describing.
The first line in the document - the XML declaration - defines the XML version and
the character encoding used in the document. In this case the document conforms
to the 1.0 specification of XML and uses the ISO-8859-1 (Latin-1/West European)
character set.
The next line describes the root element of the document (like it was saying: "this
document is a company"):
<company>
The next 4 lines describe 4 child elements of the root (to, from, heading, and body):
<to>Vyom</to>
<from>TCS</from>
<heading>Reminder</heading>
<body>Details of Emlpoyee</body>
And finally the last line defines the end of the root element:
<company>
Can you detect from this example that the XML document contains
a company to Vyom from TCS? Don't you agree that XML is pretty self-descriptive?
Elements Must Have a Closing Tag
it is illegal to omit the closing tag, with XML, .
In HTML some elements not contains closing tag.
The following code is valid in HTML:
<p>This is a author
<p>This is another author
In XML all elements must have a closing tag, e.g.:
<p>This is a author</p>
<p>This is another author</p>
Note:
You might have noticed from the previous example that
the XML declaration did not have a closing tag.
This is not an error. The declaration is not a part of the XML document itself.
It is not an XML element, and it should not have a closing tag.
XML Tags are Case Sensitive
XML tags are case sensitive in respect of HTML
With XML, the tag <Author> is different from the tag
<author>.
Opening and closing tags must therefore be written with the
same case:
<Author>This is incorrect</author>
<author>This is correct</author>
Properly Nesting of XML Elements
Improper nesting of tags makes no sense to XML.
some elements can be improperly nested within each other in HTML like this:
<b><i>"Hello World" This text is bold and italic</b></i>
In XML all elements must be properly nested within each other like this:
<b><i>"hello World" This text is bold and italic</i></b>
XML Documents Must Have a Root Element
To define a root element all XML documents must contain a single tag pair.
All other elements must be within this root element.
All elements can have child elements. child
elements must be correctly nested within their parent element:
With XML, it is illegal to omit quotation marks around attribute values.
XML elements can have attributes in name/value pairs just like in HTML.
In XML the attribute value must always be quoted. Study the two XML documents below.
The first one is incorrect, the second is correct:
The error in the first document is that the date attribute in
the note element is not quoted.
This is correct: date="10/10/2004". This is incorrect:
date=10/10/2004.
White Space is Preserved in XML
The white space in XML document is not truncated.
This is unlike HTML. With HTML, a sentence like this:
Hello my company name is VYOM,
will be displayed like this:
Hello my company name is VYOM,
because HTML reduces multiple, consecutive white space
characters to a single white space.
XML Comments
XML comment syntax is similar to that of
HTML.
<!-- This is a comment -->
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Keywords: xml syntax,xml Case Sensitive , xml documentation, xml document, xml comments element, xml tags
