PySide.QtXml.QDomDocumentFragment class is a tree of QDomNodes which is not usually a complete PySide.QtXml.QDomDocument .
If you want to do complex tree operations it is useful to have a lightweight class to store nodes and their relations. PySide.QtXml.QDomDocumentFragment stores a subtree of a document which does not necessarily represent a well-formed XML document.
PySide.QtXml.QDomDocumentFragment is also useful if you want to group several nodes in a list and insert them all together as children of some node. In these cases PySide.QtXml.QDomDocumentFragment can be used as a temporary container for this list of children.
The most important feature of PySide.QtXml.QDomDocumentFragment is that it is treated in a special way by QDomNode.insertAfter() , QDomNode.insertBefore() , QDomNode.replaceChild() and QDomNode.appendChild() : instead of inserting the fragment itself, all the fragment's children are inserted.
| 参数： | x – PySide.QtXml.QDomDocumentFragment |
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构造空文档片段。
构造副本为 x .
拷贝数据是共享的 (浅拷贝)：修改一个节点也将改变另一节点。若想要制作深度副本，使用 PySide.QtXml.QDomNode.cloneNode() .
