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Description of Attribute Properties in DTDs
Table 93 shows the properties that an attribute can have. It also provides the possible values, and a description for each property.
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.
|
| IDREFs
|
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.
|
Table 93. Attribute Property Descriptions
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