XML::DOM::DocumentFragment(3pm) User Contributed Perl Documentation XML::DOM::DocumentFragment(3pm)NAME
XML::DOM::DocumentFragment - Facilitates cut & paste in XML::DOM documents
DESCRIPTION
XML::DOM::DocumentFragment extends XML::DOM::Node
DocumentFragment is a "lightweight" or "minimal" Document object. It is very common to want to be able to extract a portion of a document's
tree or to create a new fragment of a document. Imagine implementing a user command like cut or rearranging a document by moving fragments
around. It is desirable to have an object which can hold such fragments and it is quite natural to use a Node for this purpose. While it is
true that a Document object could fulfil this role, a Document object can potentially be a heavyweight object, depending on the underlying
implementation. What is really needed for this is a very lightweight object. DocumentFragment is such an object.
Furthermore, various operations -- such as inserting nodes as children of another Node -- may take DocumentFragment objects as arguments;
this results in all the child nodes of the DocumentFragment being moved to the child list of this node.
The children of a DocumentFragment node are zero or more nodes representing the tops of any sub-trees defining the structure of the docu-
ment. DocumentFragment nodes do not need to be well-formed XML documents (although they do need to follow the rules imposed upon well-
formed XML parsed entities, which can have multiple top nodes). For example, a DocumentFragment might have only one child and that child
node could be a Text node. Such a structure model represents neither an HTML document nor a well-formed XML document.
When a DocumentFragment is inserted into a Document (or indeed any other Node that may take children) the children of the DocumentFragment
and not the DocumentFragment itself are inserted into the Node. This makes the DocumentFragment very useful when the user wishes to create
nodes that are siblings; the DocumentFragment acts as the parent of these nodes so that the user can use the standard methods from the Node
interface, such as insertBefore() and appendChild().
perl v5.8.8 2008-02-03 XML::DOM::DocumentFragment(3pm)
Check Out this Related Man Page
XML::DOM::Attr(3pm) User Contributed Perl Documentation XML::DOM::Attr(3pm)NAME
XML::DOM::Attr - An XML attribute in XML::DOM
DESCRIPTION
XML::DOM::Attr extends XML::DOM::Node.
The Attr nodes built by the XML::DOM::Parser always have one child node which is a Text node containing the expanded string value (i.e.
EntityReferences are always expanded.) EntityReferences may be added when modifying or creating a new Document.
The Attr interface represents an attribute in an Element object. Typically the allowable values for the attribute are defined in a docu-
ment type definition.
Attr objects inherit the Node interface, but since they are not actually child nodes of the element they describe, the DOM does not con-
sider them part of the document tree. Thus, the Node attributes parentNode, previousSibling, and nextSibling have a undef value for Attr
objects. The DOM takes the view that attributes are properties of elements rather than having a separate identity from the elements they
are associated with; this should make it more efficient to implement such features as default attributes associated with all elements of a
given type. Furthermore, Attr nodes may not be immediate children of a DocumentFragment. However, they can be associated with Element nodes
contained within a DocumentFragment. In short, users and implementors of the DOM need to be aware that Attr nodes have some things in com-
mon with other objects inheriting the Node interface, but they also are quite distinct.
The attribute's effective value is determined as follows: if this attribute has been explicitly assigned any value, that value is the
attribute's effective value; otherwise, if there is a declaration for this attribute, and that declaration includes a default value, then
that default value is the attribute's effective value; otherwise, the attribute does not exist on this element in the structure model until
it has been explicitly added. Note that the nodeValue attribute on the Attr instance can also be used to retrieve the string version of the
attribute's value(s).
In XML, where the value of an attribute can contain entity references, the child nodes of the Attr node provide a representation in which
entity references are not expanded. These child nodes may be either Text or EntityReference nodes. Because the attribute type may be
unknown, there are no tokenized attribute values.
METHODS
getValue
On retrieval, the value of the attribute is returned as a string. Character and general entity references are replaced with their val-
ues.
setValue (str)
DOM Spec: On setting, this creates a Text node with the unparsed contents of the string.
getName
Returns the name of this attribute.
perl v5.8.8 2008-02-03 XML::DOM::Attr(3pm)