Sintaxis:
<!ATTLIST element-name attribute-name attribute-type attribute-value>
DTD ejemplo:
<!ATTLIST payment type CDATA "check">XML ejemplo:
<payment type="check" />Donde:
- attribute-type puede tomar los valores de la tabla 1
- attribute-value puede tomar los valores de la tabla 2
Tabla 1: valores para attribute-type
|
Type |
Description |
|
CDATA |
The value is character data |
|
(en1|en2|..) |
The value must be one from an enumerated list |
|
ID |
The value is a unique id |
|
IDREF |
The value is the id of another element |
|
IDREFS |
The value is a list of other ids |
|
NMTOKEN |
The value is a valid XML name |
|
NMTOKENS |
The value is a list of valid XML names |
|
ENTITY |
The value is an entity |
|
ENTITIES |
The value is a list of entities |
|
NOTATION |
The value is a name of a notation |
|
xml: |
The value is a predefined xml value |
Tabla 2: valores para attribute-value
|
Value |
Explanation |
|
value |
The default value of the attribute |
|
#REQUIRED |
The attribute is required |
|
#IMPLIED |
The attribute is optional |
|
#FIXED value |
The attribute value is fixed |
Valor de atributo por defecto:
DTD ejemplo:
<!ELEMENT square EMPTY>
<!ATTLIST square width CDATA "0">XML ejemplo: El elemento squeare es definido como vacío con un atributo “width” de tipo CDATA y si no se especifica el valor de width, este por defecto será “0”.
<square width="100" />