Declaring Attributes in DTDs

An XML element in a well-formed document may not have two attributes of the same name. Therefore, cardinality operators are not required when attributes are declared.

The declaration of attributes takes the following general form:

<!ATTLIST 
 attributeName attributeType defaultDeclaration 
>

The attributeType is any of the values in the following list:

  • CDATA— Any legal XML string.

  • ENTITY— Value that must match the name of an external unparsed entity.

  • ENTITIES— An ENTITY, except that more than one whitespace-separated name may occur.

  • ID— Value that must begin with a letter and then must consist of letters, numeric characters, hyphens, underscores, and period characters. At most, one attribute on any element can be ...

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