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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 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 insertBefore() and
appendChild().
| Fields inherited from interface org.w3c.dom.Node |
ATTRIBUTE_NODE,
CDATA_SECTION_NODE,
COMMENT_NODE,
DOCUMENT_FRAGMENT_NODE,
DOCUMENT_NODE,
DOCUMENT_TYPE_NODE,
ELEMENT_NODE,
ENTITY_NODE,
ENTITY_REFERENCE_NODE,
NOTATION_NODE,
PROCESSING_INSTRUCTION_NODE,
TEXT_NODE |
| Methods inherited from interface org.w3c.dom.Node |
appendChild,
cloneNode,
getAttributes,
getChildNodes,
getFirstChild,
getLastChild,
getNextSibling,
getNodeName,
getNodeType,
getNodeValue,
getOwnerDocument,
getParentNode,
getPreviousSibling,
hasChildNodes,
insertBefore,
removeChild,
replaceChild,
setNodeValue |
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