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public interface DocumentFragment
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
fulfill 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 document. 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 Node.insertBefore
and
Node.appendChild
.
See also the Document Object Model (DOM) Level 3 Core Specification.
Field Summary |
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Method Summary |
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Methods inherited from interface org.w3c.dom.Node |
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appendChild, cloneNode, compareDocumentPosition, getAttributes, getBaseURI, getChildNodes, getFeature, getFirstChild, getLastChild, getLocalName, getNamespaceURI, getNextSibling, getNodeName, getNodeType, getNodeValue, getOwnerDocument, getParentNode, getPrefix, getPreviousSibling, getTextContent, getUserData, hasAttributes, hasChildNodes, insertBefore, isDefaultNamespace, isEqualNode, isSameNode, isSupported, lookupNamespaceURI, lookupPrefix, normalize, removeChild, replaceChild, setNodeValue, setPrefix, setTextContent, setUserData |
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