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Description of Attribute Properties in DTDs
Description of Attribute Properties in DTDs
Table 62 shows the properties that an attribute can have. It also provides the possible values, and a description for each property.
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Property
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Allowable Values
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Description
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Type
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Attribute
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All attribute nodes have this type.
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Name
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String
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Identifier for the particular attribute.
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Restrictions
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Fixed
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The attribute is required and it must always have the value specified by the
Default property. You must always explicitly specify this attribute.
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Implied
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The attribute is optional. There is no default value.
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Optional
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The attribute is optional. If you do not specify it, the XML parser uses the value of the
Default property.
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Required
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The element must always explicitly specify this attribute and assign a value to it.
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Content Type
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CDATA
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The attribute value can contain any valid character data. It is a text string.
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Entity
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The attribute value is the name of an entity defined in the DTD.
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Entities
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The attribute value is a space-separated list of entities that are defined in the DTD.
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Enumerated
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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.
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ID
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The attribute value is a unique name within the DTD.
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IDREF
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The attribute value is an ID that is defined in the DTD.
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IDREFs
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The attribute value is a space-separated list of IDs that are defined in the DTD.
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NMToken
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The attribute value is a valid XML name that is composed of letters, numbers, hyphens, underscores, and colons.
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NMTokens
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The attribute value is a space-separated list of name tokens.
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Notation
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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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Table 62. Attribute Property Descriptions
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