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XML : DTD

 

“Scale” element to be empty with a “length“ attribute of type CDATA . If no length is specified, it has a default value of 0.

Valid XML:

<Scale length =”100" />

REQUIRED Syntax

<!ATTLIST element-name attribute_name
attribute-type #REQUIRED>

DTD Example

<!ATTLIST person number CDATA
#REQUIRED>

Valid XML:
<person id=”5677" />

Invalid XML:
<person />

Use the #REQUIRED keyword if you don’t have an option for a default value, but still want to force the attribute to be present.

IMPLIED Syntax

<!ATTLIST element-name attribute-name
attribute-type #IMPLIED>

DTD Example

<!ATTLIST emergency no. CDATA #IMPLIED>
Valid XML:
 
emergency no.=”555-667788" />
Valid XML:
<emergency/>

Use the #IMPLIED keyword if you don’t want to force the author to include an attribute, and you don’t have an option for a default value.

FIXED Syntax

<!ATTLIST element-name attribute-name
attribute-type #FIXED “value”>

DTD Example

<!ATTLIST Client CDATA #FIXED
“RoseIndia”>

Valid XML:
<Client =”RoseIndia” />

Invalid XML:
<Client=”LotusIndia” />

Use the #FIXED keyword when you want an attribute to have a fixed value without allowing the author to change it. If an author includes another value, the XML parser will
return an error.

Enumerated Attribute Values

Syntax

<!ATTLIST element-name attribute-name
(en1|en2|..) default-value>
Jan 2008 | Java Jazz Up |34
 
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