About
XML DTD and its various componentsThe
DTD is a building block of an XML document. It defines a list of legal documents
for the document structure. A DTD can be specified either externally or internally
in a document.
With the help of a DTD each of your XML files can carry
information in their own format. A standard DTD can be used to verify whether
the data you receive from outside is valid or not. A DTD can be declared either
internally or externally. The following are the simple building blocks of XML:
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*
Tags
* Elements
* Entities
* Attributes
* CDDATA
* PCDATA
TAGS: These
are used to markup elements. These are used for formatting codes. This indicates
how a document will appear when displayed.
Example: <Wish>
<To>John</to>
<From>Jill</From>
<Heading>Reminder</Heading>
<Body>HAPPY BIRTHDAY</Body>
</Wish>
In the above example
the term “wish” is the tag. ELEMENTS: These
are the main building blocks of XML documents. Elements can contain text or they
can be empty Example: <Wish>
<To>John</To>
<From>Jill</From>
<Heading>Reminder</Heading>
<Body>HAPPY BIRTHDAY</Body>
</Wish> In
the above example the terms <to>, <from>, <body> are the elements. ENTITIES: They
are variables to define common text. A
few of the predefined entities in XML are as follows:
| Entity
References | Character |
| > |
> |
| < |
< |
| " |
“ |
| & |
& |
| ' |
' |
ATTRIBUTES:
They provide extra information about elements.
Example: <Img
src="computer.gif" /> In
the above example the Img provides more information about the image by specifying
source of the image using the attribute “src”. CDATA: Cdata
means Character Data. It is a text that will not be parsed by the parser. The
text inside these tags is not treated as markups and the entities will not be
expanded.
PCDATA: PcData
denotes “Parsed Character Data”. PcData is the text parsed by the parser.
The text inside these tags is treated as markups and the entities will be expanded.
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XML News
by CaptainPinko (3.36) on Sat 12th Nov 2005 18:58 UTC (OS News)
Besides becoming modularised (which should payoff in subsequent releases), are there any noteworthy changes? After all, if there weren't, why bother releasing a 6.9?
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