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NSXMLDTD Class Reference

Inherits from
Conforms to
Framework
/System/Library/Frameworks/Foundation.framework
Availability
Available in Mac OS X v10.4 and later.
Companion guide
Declared in
NSXMLDTD.h

Overview

An instance of the NSXMLDTD class represents a Document Type Definition. It is held as a property of an NSXMLDocument instance, accessed through the NSXMLDocument method DTD (and set via setDTD:).

In the data model, an NSXMLDTD object is conceptually similar to namespace and attribute nodes: it is not considered to be a child of the NSXMLDocument object although it is closely associated with it. It is at the “root” of a shallow tree consisting primarily of nodes representing DTD declarations. Acceptable child nodes are instances of the NSXMLDTDNode class as well as NSXMLNode objects representing comment nodes and processing-instruction nodes.

You create an NSXMLDTD object in one of three ways:

Once an NSXMLDTD instance is in place, you can add, remove, and change the NSXMLDTDNode objects representing various DTD declarations. When you write the document out as XML, the new or modified internal DTD is included (assuming you set the DTD in the NSXMLDocument instance). You may also programmatically create an external DTD and write that out to its own file.

Tasks

Initializing an NSXMLDTD Object

Managing DTD Identifiers

Manipulating Child Nodes

Getting DTD Nodes by Name

Class Methods

predefinedEntityDeclarationForName:

Returns a DTD node representing the predefined entity declaration with the specified name.

+ (NSXMLDTDNode *)predefinedEntityDeclarationForName:(NSString *)name

Parameters
name

A string identifying a predefined entity declaration.

Return Value

An autoreleased NSXMLDTDNode object, or nil if there is no match for name.

Discussion

The five predefined entity references (or character references) are “<” (less-than sign), “>” (greater-than sign), “&” (ampersand), “"” (quotation mark), and “'” (apostrophe).

Availability
See Also
Declared In
NSXMLDTD.h

Instance Methods

addChild:

Adds a child node to the end of the list of existing children.

- (void)addChild:(NSXMLNode *)child

Parameters
child

The node object to add to the existing children.

Availability
See Also
Declared In
NSXMLDTD.h

attributeDeclarationForName:elementName:

Returns the DTD node representing an attribute-list declaration for a given attribute and its element.

- (NSXMLDTDNode *)attributeDeclarationForName:(NSString *)attrName elementName:(NSString *)elementName

Parameters
attrName

A string object identifying the name of an attribute.

elementName

A string object identifying the name of an element.

Return Value

An autoreleased NSXMLDTDNode object, or nil if there is no matching attribute-list declaration.

Discussion

For example, in the attribute-list declaration:

<!ATTLIST person idnum CDATA "0000">

“idnum” would correspond to attrName and “person” would correspond to elementName.

Availability
Declared In
NSXMLDTD.h

elementDeclarationForName:

Returns the DTD node representing an element declaration for a specified element.

- (NSXMLDTDNode *)elementDeclarationForName:(NSString *)elementName

Parameters
elementName

A string that is the name of an element.

Return Value

An autoreleased NSXMLDTDNode object, or nil if there is no match.

Availability
Declared In
NSXMLDTD.h

entityDeclarationForName:

Returns the DTD node representing the entity declaration for a specified entity.

- (NSXMLDTDNode *)entityDeclarationForName:(NSString *)entityName

Parameters
entityName

A string that is the name of an entity.

Return Value

An autoreleased NSXMLDTDNode object, or nil if there is no match.

Availability
Declared In
NSXMLDTD.h

initWithContentsOfURL:options:error:

Initializes and returns an NSXMLDTD object created from the DTD declarations in a URL-referenced source.

- (id)initWithContentsOfURL:(NSURL *)url options:(NSUInteger)mask error:(NSError **)error

Parameters
url

An NSURL object identifying a URL source.

mask

A bit mask specifying input options; bit-OR multiple options. The current valid options are NSXMLNodePreserveWhitespace and NSXMLNodePreserveEntities; these constants are described in the "Constants" section of the NSXMLNode reference.

error

On return, this parameter holds an NSError object describing any errors and warnings related to parsing and remote connection.

Return Value

An initialized NSXMLDTD object or nil if initialization fails because of parsing errors or other reasons.

Discussion

You use this method to create a stand-alone DTD which you can thereafter query and use for validation. You can associate the DTD created through this message with a document by sending setDTD: to an NSXMLDocument object.

Availability
See Also
Declared In
NSXMLDTD.h

initWithData:options:error:

Initializes and returns an NSXMLDTD object created from the DTD declarations encapsulated in an NSData object

- (id)initWithData:(NSData *)data options:(NSUInteger)mask error:(NSError **)error

Parameters
data

A data object containing DTD declarations.

mask

A bit mask specifying input options; bit-OR multiple options. The current valid options are NSXMLNodePreserveWhitespace and NSXMLNodePreserveEntities; these constants are described in the "Constants" section of the NSXMLNode reference.

error

On return, this parameter holds an NSError object describing any errors and warnings related to parsing and remote connection.

Return Value

An initialized NSXMLDTD object or nil if initialization fails because of parsing errors or other reasons.

Discussion

This method is the designated initializer for the NSXMLDTD class. You use this method to create a stand-alone DTD which you can thereafter query and use for validation. You can associate the DTD created through this message with a document by sending setDTD: to an NSXMLDocument object.

Availability
See Also
Declared In
NSXMLDTD.h

insertChild:atIndex:

Inserts a child node in the receiver’s list of children at a specific location in the list.

- (void)insertChild:(NSXMLNode *)child atIndex:(NSUInteger)index

Parameters
child

An XML-node object that represents the child to insert.

index

An integer identifying the location in the receiver's list of children to insert child. The indices of subsequent children in the list are incremented by one.

Availability
See Also
Declared In
NSXMLDTD.h

insertChildren:atIndex:

Inserts an array of child nodes at a specified location in the receiver’s list of children.

- (void)insertChildren:(NSArray *)children atIndex:(NSUInteger)index

Parameters
children

An array of NSXMLNode objects to insert as children of the receiver.

index

An integer identifying the location in the list of current children to make the insertion. The indices of subsequent children in the list are incremented by the number of inserted children.

Availability
See Also
Declared In
NSXMLDTD.h

notationDeclarationForName:

Returns the DTD node representing the notation declaration identified by the specified notation name.

- (NSXMLDTDNode *)notationDeclarationForName:(NSString *)notationName

Parameters
notationName

A string that is the name of a notation.

Return Value

An autoreleased NSXMLDTDNode object, or nil if there is no match.

Availability
Declared In
NSXMLDTD.h

publicID

Returns the receiver’s public identifier.

- (NSString *)publicID

Availability
See Also
Declared In
NSXMLDTD.h

removeChildAtIndex:

Removes the child node at a particular location in the receiver’s list of children.

- (void)removeChildAtIndex:(NSUInteger)index

Parameters
index

An integer identifying the child node to remove. The indices of subsequent children in the list are decremented by one.

Discussion

The removed child node is released.

Availability
See Also
Declared In
NSXMLDTD.h

replaceChildAtIndex:withNode:

Replaces a child at a particular index with another child.

- (void)replaceChildAtIndex:(NSUInteger)index withNode:(NSXMLNode *)node

Parameters
index

An integer identifying the position of a node in the receiver's list of child nodes.

node

An NSXMLNode object to replace the object at index.

Discussion

The replaced child node is released.

Availability
See Also
Declared In
NSXMLDTD.h

setChildren:

Removes all existing children of the receiver and replaces them with an array of new child nodes.

- (void)setChildren:(NSArray *)children

Parameters
children

An array of NSXMLNode objects. To remove all existing children, pass in nil.

Discussion

Replaced or removed child nodes are released.

Availability
See Also
Declared In
NSXMLDTD.h

setPublicID:

Sets the public identifier of the receiver.

- (void)setPublicID:(NSString *)publicID

Parameters
publicID

A string object specifying a public identifier.

Discussion

This identifier should be in the default catalog in /etc/xml/catalog or in a path specified by the environment variable XML_CATALOG_FILES. When the public ID is set the system ID must also be set.

Availability
See Also
Declared In
NSXMLDTD.h

setSystemID:

Sets the system identifier of the receiver.

- (void)setSystemID:(NSString *)systemID

Parameters
systemID

A string object that encapsulates a URL locating a valid DTD.

Availability
See Also
Declared In
NSXMLDTD.h

systemID

Returns the receiver’s system identifier.

- (NSString *)systemID

Availability
See Also
Declared In
NSXMLDTD.h

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© 2007 Apple Inc. All Rights Reserved. (Last updated: 2007-02-27)

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