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document, it should be wrapped in a
DOCTYPE definition with the following syntax:
<!DOCTYPE root-element [elementdeclarations]>
Example of a XML document with an internal DTD: E-mail.xml
<?xml version=”1.0"?>
<!DOCTYPE E-mail[
<!ELEMENT E-mail (To,From,subject,Body)>
<!ELEMENT To (#PCDATA)>
<!ELEMENT From (#PCDATA)>
<!ELEMENT Subject (#PCDATA)>
<!ELEMENT Body (#PCDATA)>
]>
<E-mail>
<To>Rohan</To>
<From>Amit</From>
<Subject>Surprise....</Subject>
<Body>Be ready for a cruise...i will catch u
tonight</Body>
</E-mail> |
Open the file E-mail.xml in a web-browser.
External DTD
If the DTD is defined in an external file, it
should be wrapped in a DOCTYPE definition
with the following syntax:
<!DOCTYPE root-element SYSTEM “filename”> |
|
This is the same XML document as
above,(but with an external DTD ) : Email.
xml
<?xml version=”1.0"?>
<!DOCTYPE E-mail SYSTEM “E-mail.dtd”>
<E-mail>
<To>Rohan</To>
<From>Amit</From>
<Subject>Surprise....</Subject>
<Body>Be ready for a cruise...i will catch u
tonight</Body>
</E-mail>
And this is the file “E-mail.dtd” which contains
the following DTD:
<!ELEMENT E-mail (To,From,subject,Body)>
<!ELEMENT To (#PCDATA)>
<!ELEMENT From (#PCDATA)>
<!ELEMENT Subject (#PCDATA)>
<!ELEMENT Body (#PCDATA)> |
Open the file E-mail.xml in a web-browser.
Importance of a DTD:
1. With a DTD, a XML file carries a
description of its own format.
2. With a DTD, independent groups of
people can agree to use a standard DTD
for interchanging data.
3. User application can use a standard DTD
to verify that the data he receives from
the outside world is valid.
4. User can also use a DTD to verify his
own data. |
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Jan
2008 | Java Jazz Up |30 |
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