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About Node Properties in DTDs
About Node Properties in DTDs
Each node in a DTD is associated with one or more properties. Every node has a
Type property. The properties associated with a node vary according to the value of the
Type property. Stylus Studio supports the following values for the
Type property of a node in a DTD:
-
Element
-
Attribute
-
DTD Modifier
-
PCDATA
-
Entity
-
Parameter Entity
-
Text
-
Comment
To determine the properties for a particular node in a DTD, click the node. Stylus Studio displays the properties in the
Properties window. If the
Properties window is not visible, select
View >
Properties from the Stylus Studio menu bar.
To change a property, double-click the property value in the
Properties window. Enter the new value or, if a drop-down menu appears, double-click the value you want. Any changes you make in the
Properties window are immediately reflected in the
Tree and
Text views. You cannot change the type property of a node.
The remainder of this section discusses the following topics:
Description of Element Properties in DTDs
An element has three properties:
Type,
Name, and
Content Model. The
Name property is a string that identifies the element. The
Content Model property describes the allowed contents for the element.
Table 56 describes the possible values of the
Content Model property for
Element nodes:
|
Value of Content Model Property
|
Description
|
|
Empty
|
This element can contain only attributes.
|
|
Element Only
|
This element can contain attributes and specified elements. It cannot directly contain raw data.
|
|
Mixed
|
This element can contain attributes, specified elements, and raw data.
|
|
Any
|
This element can contain attributes, any elements defined in this DTD, and raw data.
|
Table 56. Element Property Descriptions
Description of Attribute Properties in DTDs
Table 57 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 57. Attribute Property Descriptions
Description of Entity and Parameter Entity Properties in DTDs
Table 58 shows the properties that an entity or parameter entity can have. It also provides the possible values, and a description for each property.
|
Property
|
Allowable Values
|
Description
|
|
Type
|
Entity
Parameter Entity
|
All entity nodes have this type.
|
|
Name
|
String
|
Identifier for this entity.
|
|
Location
|
External or Internal
|
An external location indicates that the value of the entity is in a file that is outside the DTD file.
An internal location indicates that the value of the entity is defined in the
Value property of this entity node.
|
|
Value
|
String
|
If the value of the
Location property is
Internal, this property specifies the value of the entity. If the value of the
Location property is
External, you cannot specify this property.
|
|
Public ID
|
String
|
String that some parsers can resolve to a file location. Stylus Studio ignores any value you specify.
|
|
System ID
|
String
|
Path or URI for a file that contains the value of the entity.
|
|
Parsed
|
True or False
|
Indicates whether the entity value is parsed XML. A parameter entity does not have this property.
|
Table 58. Entity and Parameter Entity Property Descriptions
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