Description of Attribute Properties in DTDs

Table 50 shows the properties that an attribute can have. It also provides the possible values, and a description for each property.

Table 50. Attribute Property Descriptions
Property	Allowable Values	Description
`Type`	`Attribute`	All attribute nodes have this type.
`Name`	`String`	Identifier for the particular attribute.
`Restrictions`	`Fixed`	The attribute is required and it must always have the value specified by the `Default` property. You must always explicitly specify this attribute.
	`Implied`	The attribute is optional. There is no default value.
	`Optional`	The attribute is optional. If you do not specify it, the XML parser uses the value of the `Default` property.
	`Required`	The element must always explicitly specify this attribute and assign a value to it.
`Content Type`	`CDATA`	The attribute value can contain any valid character data. It is a text string.
	`Entity`	The attribute value is the name of an entity defined in the DTD.
	`Entities`	The attribute value is a space-separated list of entities that are defined in the DTD.
	`Enumerated`	The attribute value is one of a set of specified values. When the value of the `Content Type` property is `Enumerated`, the attribute has an additional property: `Allowed Values`. Specify the allowed values in a space-separated list.
	`ID`	The attribute value is a unique name within the DTD.
	`IDREF`	The attribute value is an ID that is defined in the DTD.
	`IDREF`s	The attribute value is a space-separated list of IDs that are defined in the DTD.
	`NMToken`	The attribute value is a valid XML name that is composed of letters, numbers, hyphens, underscores, and colons.
	`NMTokens`	The attribute value is a space-separated list of name tokens.
	`Notation`	The name of a notation specified in the DTD. The notation describes a non-XML data format, such as those used for image files. When the value of the `Content Type` property is `Notation`, the attribute has an additional property: `Allowed Values`. Specify the allowed values in a space-separated list.

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