Ubuntu Manpage: XML::DOM::Node - Super class of all nodes in XML::DOM

NAME

       XML::DOM::Node - Super class of all nodes in XML::DOM

DESCRIPTION

XML::DOM::Node is the super class of all nodes in an XML::DOM document. This means that all nodes that
subclass XML::DOM::Node also inherit all the methods that XML::DOM::Node implements.

GLOBAL VARIABLES
@NodeNames
The variable @XML::DOM::Node::NodeNames maps the node type constants to strings. It is used by
XML::DOM::Node::getNodeTypeName.

METHODS
getNodeType
Return an integer indicating the node type. See XML::DOM constants.

getNodeName
Return a property or a hardcoded string, depending on the node type. Here are the corresponding
functions or values:

Attr getName
AttDef getName
AttlistDecl getName
CDATASection "#cdata-section"
Comment "#comment"
Document "#document"
DocumentType getNodeName
DocumentFragment "#document-fragment"
Element getTagName
ElementDecl getName
EntityReference getEntityName
Entity getNotationName
Notation getName
ProcessingInstruction getTarget
Text "#text"
XMLDecl "#xml-declaration"

Not In DOM Spec: AttDef, AttlistDecl, ElementDecl and XMLDecl were added for completeness.

getNodeValue and setNodeValue (value)
Returns a string or undef, depending on the node type. This method is provided for completeness. In
other languages it saves the programmer an upcast. The value is either available thru some other
method defined in the subclass, or else undef is returned. Here are the corresponding methods:
Attr::getValue, Text::getData, CDATASection::getData, Comment::getData,
ProcessingInstruction::getData.

getParentNode and setParentNode (parentNode)
The parent of this node. All nodes, except Document, DocumentFragment, and Attr may have a parent.
However, if a node has just been created and not yet added to the tree, or if it has been removed
from the tree, this is undef.

getChildNodes
A NodeList that contains all children of this node. If there are no children, this is a NodeList
containing no nodes. The content of the returned NodeList is "live" in the sense that, for instance,
changes to the children of the node object that it was created from are immediately reflected in the
nodes returned by the NodeList accessors; it is not a static snapshot of the content of the node.
This is true for every NodeList, including the ones returned by the getElementsByTagName method.

NOTE: this implementation does not return a "live" NodeList for getElementsByTagName. See CAVEATS.

When this method is called in a list context, it returns a regular perl list containing the child
nodes. Note that this list is not "live". E.g.

@list = $node->getChildNodes; # returns a perl list
$nodelist = $node->getChildNodes; # returns a NodeList (object reference)
for my $kid ($node->getChildNodes) # iterate over the children of $node

getFirstChild
The first child of this node. If there is no such node, this returns undef.

getLastChild
The last child of this node. If there is no such node, this returns undef.

getPreviousSibling
The node immediately preceding this node. If there is no such node, this returns undef.

getNextSibling
The node immediately following this node. If there is no such node, this returns undef.

getAttributes
A NamedNodeMap containing the attributes (Attr nodes) of this node (if it is an Element) or undef
otherwise. Note that adding/removing attributes from the returned object, also adds/removes
attributes from the Element node that the NamedNodeMap came from.

getOwnerDocument
The Document object associated with this node. This is also the Document object used to create new
nodes. When this node is a Document this is undef.

insertBefore (newChild, refChild)
Inserts the node newChild before the existing child node refChild. If refChild is undef, insert
newChild at the end of the list of children.

If newChild is a DocumentFragment object, all of its children are inserted, in the same order, before
refChild. If the newChild is already in the tree, it is first removed.

Return Value: The node being inserted.

DOMExceptions:

• HIERARCHY_REQUEST_ERR

Raised if this node is of a type that does not allow children of the type of the newChild node,
or if the node to insert is one of this node's ancestors.

• WRONG_DOCUMENT_ERR

Raised if newChild was created from a different document than the one that created this node.

• NO_MODIFICATION_ALLOWED_ERR

Raised if this node is readonly.

• NOT_FOUND_ERR

Raised if refChild is not a child of this node.

replaceChild (newChild, oldChild)
Replaces the child node oldChild with newChild in the list of children, and returns the oldChild
node. If the newChild is already in the tree, it is first removed.

Return Value: The node replaced.

DOMExceptions:

• HIERARCHY_REQUEST_ERR

Raised if this node is of a type that does not allow children of the type of the newChild node,
or it the node to put in is one of this node's ancestors.

• WRONG_DOCUMENT_ERR

Raised if newChild was created from a different document than the one that created this node.

• NO_MODIFICATION_ALLOWED_ERR

Raised if this node is readonly.

• NOT_FOUND_ERR

Raised if oldChild is not a child of this node.

removeChild (oldChild)
Removes the child node indicated by oldChild from the list of children, and returns it.

Return Value: The node removed.

DOMExceptions:

• NO_MODIFICATION_ALLOWED_ERR

Raised if this node is readonly.

• NOT_FOUND_ERR

Raised if oldChild is not a child of this node.

appendChild (newChild)
Adds the node newChild to the end of the list of children of this node. If the newChild is already in
the tree, it is first removed. If it is a DocumentFragment object, the entire contents of the
document fragment are moved into the child list of this node

Return Value: The node added.

DOMExceptions:

• HIERARCHY_REQUEST_ERR

Raised if this node is of a type that does not allow children of the type of the newChild node,
or if the node to append is one of this node's ancestors.

• WRONG_DOCUMENT_ERR

Raised if newChild was created from a different document than the one that created this node.

• NO_MODIFICATION_ALLOWED_ERR

Raised if this node is readonly.

hasChildNodes
This is a convenience method to allow easy determination of whether a node has any children.

Return Value: 1 if the node has any children, 0 otherwise.

cloneNode (deep)
Returns a duplicate of this node, i.e., serves as a generic copy constructor for nodes. The duplicate
node has no parent (parentNode returns undef.).

Cloning an Element copies all attributes and their values, including those generated by the XML
processor to represent defaulted attributes, but this method does not copy any text it contains
unless it is a deep clone, since the text is contained in a child Text node. Cloning any other type
of node simply returns a copy of this node.

Parameters:
deep If true, recursively clone the subtree under the specified node. If false, clone only the
node itself (and its attributes, if it is an Element).

Return Value: The duplicate node.

normalize
Puts all Text nodes in the full depth of the sub-tree underneath this Element into a "normal" form
where only markup (e.g., tags, comments, processing instructions, CDATA sections, and entity
references) separates Text nodes, i.e., there are no adjacent Text nodes. This can be used to ensure
that the DOM view of a document is the same as if it were saved and re-loaded, and is useful when
operations (such as XPointer lookups) that depend on a particular document tree structure are to be
used.

Not In DOM Spec: In the DOM Spec this method is defined in the Element and Document class interfaces
only, but it doesn't hurt to have it here...

getElementsByTagName (name [, recurse])
Returns a NodeList of all descendant elements with a given tag name, in the order in which they would
be encountered in a preorder traversal of the Element tree.

Parameters:
name The name of the tag to match on. The special value "*" matches all tags.
recurse Whether it should return only direct child nodes (0) or any descendant that matches the tag
name (1). This argument is optional and defaults to 1. It is not part of the DOM spec.

Return Value: A list of matching Element nodes.

NOTE: this implementation does not return a "live" NodeList for getElementsByTagName. See CAVEATS.

When this method is called in a list context, it returns a regular perl list containing the result
nodes. E.g.

@list = $node->getElementsByTagName("tag"); # returns a perl list
$nodelist = $node->getElementsByTagName("tag"); # returns a NodeList (object ref.)
for my $elem ($node->getElementsByTagName("tag")) # iterate over the result nodes

Additional methods not in the DOM Spec
getNodeTypeName
Return the string describing the node type. E.g. returns "ELEMENT_NODE" if getNodeType returns
ELEMENT_NODE. It uses @XML::DOM::Node::NodeNames.

toString
Returns the entire subtree as a string.

printToFile (filename)
Prints the entire subtree to the file with the specified filename.

Croaks: if the file could not be opened for writing.

printToFileHandle (handle)
Prints the entire subtree to the file handle. E.g. to print to STDOUT:

$node->printToFileHandle (\*STDOUT);

print (obj)
Prints the entire subtree using the object's print method. E.g to print to a FileHandle object:

$f = new FileHandle ("file.out", "w");
$node->print ($f);

getChildIndex (child)
Returns the index of the child node in the list returned by getChildNodes.

Return Value: the index or -1 if the node is not found.

getChildAtIndex (index)
Returns the child node at the specified index or undef.

addText (text)
Appends the specified string to the last child if it is a Text node, or else appends a new Text node
(with the specified text.)

Return Value: the last child if it was a Text node or else the new Text node.

dispose
Removes all circular references in this node and its descendants so the objects can be claimed for
garbage collection. The objects should not be used afterwards.

setOwnerDocument (doc)
Sets the ownerDocument property of this node and all its children (and attributes etc.) to the
specified document. This allows the user to cut and paste document subtrees between different
XML::DOM::Documents. The node should be removed from the original document first, before calling
setOwnerDocument.

This method does nothing when called on a Document node.

isAncestor (parent)
Returns 1 if parent is an ancestor of this node or if it is this node itself.

expandEntityRefs (str)
Expands all the entity references in the string and returns the result. The entity references can be
character references (e.g. "&#123;" or "&#x1fc2"), default entity references ("&quot;", "&gt;",
"&lt;", "&apos;" and "&amp;") or entity references defined in Entity objects as part of the
DocumentType of the owning Document. Character references are expanded into UTF-8. Parameter entity
references (e.g. %ent;) are not expanded.

to_sax ( %HANDLERS )
E.g.

$node->to_sax (DocumentHandler => $my_handler,
Handler => $handler2 );

%HANDLERS may contain the following handlers:

• DocumentHandler

• DTDHandler

• EntityResolver

• Handler

Default handler when one of the above is not specified

Each XML::DOM::Node generates the appropriate SAX callbacks (for the appropriate SAX handler.)
Different SAX handlers can be plugged in to accomplish different things, e.g. XML::Checker would
check the node (currently only Document and Element nodes are supported), XML::Handler::BuildDOM
would create a new DOM subtree (thereby, in essence, copying the Node) and in the near future,
XML::Writer could print the node. All Perl SAX related work is still in flux, so this interface may
change a little.

See PerlSAX for the description of the SAX interface.

check ( [$checker] )
See descriptions for check() in XML::DOM::Document and XML::DOM::Element.

xql ( @XQL_OPTIONS )
To use the xql method, you must first use XML::XQL and XML::XQL::DOM. This method is basically a
shortcut for:

$query = new XML::XQL::Query ( @XQL_OPTIONS );
return $query->solve ($node);

If the first parameter in @XQL_OPTIONS is the XQL expression, you can leave off the 'Expr' keyword,
so:

$node->xql ("doc//elem1[@attr]", @other_options);

is identical to:

$node->xql (Expr => "doc//elem1[@attr]", @other_options);

See XML::XQL::Query for other available XQL_OPTIONS. See XML::XQL and XML::XQL::Tutorial for more
info.

isHidden ()
Whether the node is hidden. See Hidden Nodes for details.

perl v5.36.0 2022-10-14 XML::DOM::Node(3pm)