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XML::DOM::Element(3pm) User Contributed Perl Documentation XML::DOM::Element(3pm)
NAME
XML::DOM::Element - An XML element node in XML::DOM
DESCRIPTION
XML::DOM::Element extends XML::DOM::Node.
By far the vast majority of objects (apart from text) that authors encounter when
traversing a document are Element nodes. Assume the following XML document:
<elementExample id="demo">
<subelement1/>
<subelement2><subsubelement/></subelement2>
</elementExample>
When represented using DOM, the top node is an Element node for "elementExample", which
contains two child Element nodes, one for "subelement1" and one for "subelement2".
"subelement1" contains no child nodes.
Elements may have attributes associated with them; since the Element interface inherits
from Node, the generic Node interface method getAttributes may be used to retrieve the set
of all attributes for an element. There are methods on the Element interface to retrieve
either an Attr object by name or an attribute value by name. In XML, where an attribute
value may contain entity references, an Attr object should be retrieved to examine the
possibly fairly complex sub-tree representing the attribute value. On the other hand, in
HTML, where all attributes have simple string values, methods to directly access an
attribute value can safely be used as a convenience.
METHODS
getTagName
The name of the element. For example, in:
<elementExample id="demo">
...
</elementExample>
tagName has the value "elementExample". Note that this is case-preserving in XML, as
are all of the operations of the DOM.
getAttribute (name)
Retrieves an attribute value by name.
Return Value: The Attr value as a string, or the empty string if that attribute does
not have a specified or default value.
setAttribute (name, value)
Adds a new attribute. If an attribute with that name is already present in the
element, its value is changed to be that of the value parameter. This value is a
simple string, it is not parsed as it is being set. So any markup (such as syntax to
be recognized as an entity reference) is treated as literal text, and needs to be
appropriately escaped by the implementation when it is written out. In order to assign
an attribute value that contains entity references, the user must create an Attr node
plus any Text and EntityReference nodes, build the appropriate subtree, and use
setAttributeNode to assign it as the value of an attribute.
DOMExceptions:
o INVALID_CHARACTER_ERR
Raised if the specified name contains an invalid character.
o NO_MODIFICATION_ALLOWED_ERR
Raised if this node is readonly.
removeAttribute (name)
Removes an attribute by name. If the removed attribute has a default value it is
immediately replaced.
DOMExceptions:
o NO_MODIFICATION_ALLOWED_ERR
Raised if this node is readonly.
getAttributeNode
Retrieves an Attr node by name.
Return Value: The Attr node with the specified attribute name or undef if there is no
such attribute.
setAttributeNode (attr)
Adds a new attribute. If an attribute with that name is already present in the
element, it is replaced by the new one.
Return Value: If the newAttr attribute replaces an existing attribute with the same
name, the previously existing Attr node is returned, otherwise undef is returned.
DOMExceptions:
o WRONG_DOCUMENT_ERR
Raised if newAttr was created from a different document than the one that created
the element.
o NO_MODIFICATION_ALLOWED_ERR
Raised if this node is readonly.
o INUSE_ATTRIBUTE_ERR
Raised if newAttr is already an attribute of another Element object. The DOM user
must explicitly clone Attr nodes to re-use them in other elements.
removeAttributeNode (oldAttr)
Removes the specified attribute. If the removed Attr has a default value it is
immediately replaced. If the Attr already is the default value, nothing happens and
nothing is returned.
Parameters:
oldAttr The Attr node to remove from the attribute list.
Return Value: The Attr node that was removed.
DOMExceptions:
o NO_MODIFICATION_ALLOWED_ERR
Raised if this node is readonly.
o NOT_FOUND_ERR
Raised if oldAttr is not an attribute of the element.
Additional methods not in the DOM Spec
setTagName (newTagName)
Sets the tag name of the Element. Note that this method is not portable between DOM
implementations.
DOMExceptions:
o INVALID_CHARACTER_ERR
Raised if the specified name contains an invalid character.
check ($checker)
Uses the specified XML::Checker to validate the document. NOTE: an XML::Checker must
be supplied. The checker can be created in different ways, e.g. when parsing a
document with XML::DOM::ValParser, or with XML::DOM::Document::createChecker(). See
XML::Checker for more info.
perl v5.30.0 2019-11-24 XML::DOM::Element(3pm)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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