# QDomNamedNodeMap Class Reference
## [[QtXml](index.htm) module]
该QDomNamedNodeMap类包含了可以通过名称访问的节点的集合。[More...](#details)
### Methods
* `__init__ (self)`
* `__init__ (self, QDomNamedNodeMap)`
* `bool contains (self, QString name)`
* `int count (self)`
* `bool isEmpty (self)`
* `QDomNode item (self, int index)`
* `int length (self)`
* `QDomNode namedItem (self, QString name)`
* `QDomNode namedItemNS (self, QString nsURI, QString localName)`
* `QDomNode removeNamedItem (self, QString name)`
* `QDomNode removeNamedItemNS (self, QString nsURI, QString localName)`
* `QDomNode setNamedItem (self, QDomNode newNode)`
* `QDomNode setNamedItemNS (self, QDomNode newNode)`
* `int size (self)`
### Special Methods
* `bool __eq__ (self, QDomNamedNodeMap)`
* `__len__ (self)`
* `bool __ne__ (self, QDomNamedNodeMap)`
* * *
## Detailed Description
该QDomNamedNodeMap类包含了可以通过名称访问的节点的集合。
需要注意的是QDomNamedNodeMap不从继承[QDomNodeList](qdomnodelist.html)。 QDomNamedNodeMaps不提供任何特定的节点的顺序。虽然在QDomNamedNodeMap节点可以按序号索引访问，这简直是允许的QDomNamedNodeMap的内容，方便枚举，并不意味着DOM指定节点的排序。
该QDomNamedNodeMap是用在三个地方：
1. [QDomDocumentType.entities](qdomdocumenttype.html#entities)（）返回在DTD中描述的所有实体的地图。
2. [QDomDocumentType.notations](qdomdocumenttype.html#notations)（）返回在DTD中描述的所有符号的地图。
3. [QDomNode.attributes](qdomnode.html#attributes)（）返回一个元素的所有属性的地图。
在地图上项目，确定哪些QDomNode.name （）返回的名称。节点使用检索[namedItem](qdomnamednodemap.html#namedItem)（ ）[namedItemNS](qdomnamednodemap.html#namedItemNS)（）或[item](qdomnamednodemap.html#item)（ ） 。新节点插入[setNamedItem](qdomnamednodemap.html#setNamedItem)（）或[setNamedItemNS](qdomnamednodemap.html#setNamedItemNS)（ ）中，用去除[removeNamedItem](qdomnamednodemap.html#removeNamedItem)（）或[removeNamedItemNS](qdomnamednodemap.html#removeNamedItemNS)（ ） 。使用[contains](qdomnamednodemap.html#contains)（ ），看看是否具有给定名称的产品在命名节点图。项的数目被返回[length](qdomnamednodemap.html#length)（ ） 。
术语：在这个类中我们使用“项目”和“节点”可以互换。
* * *
## Method Documentation
```
QDomNamedNodeMap.__init__ (self)
```
构造一个空的命名节点图。
```
QDomNamedNodeMap.__init__ (self, QDomNamedNodeMap)
```
构造的副本_n_。
```
bool QDomNamedNodeMap.contains (self, QString name)
```
如果地图包含称为一个节点，则返回True_name_否则返回False 。
**Note:**这个功能并不需要命名空间的存在考虑。使用[namedItemNS](qdomnamednodemap.html#namedItemNS)（ ）来测试地图是否包含与特定的命名空间URI和名称的节点。
```
int QDomNamedNodeMap.count (self)
```
这个功能是为Qt API的一致性。它相当于[length](qdomnamednodemap.html#length)（ ） 。
```
bool QDomNamedNodeMap.isEmpty (self)
```
返回True如果该映射为空，否则返回False 。这个功能是为Qt API的一致性。
```
QDomNode QDomNamedNodeMap.item (self, int index)
```
[
检索位置的节点_index_。
这可以用来遍历图。请注意，在图中的节点被任意排列。
](qdomnode.html)
[**See also**](qdomnode.html) [length](qdomnamednodemap.html#length)（ ） 。
```
int QDomNamedNodeMap.length (self)
```
返回节点的地图数。
**See also** [item](qdomnamednodemap.html#item)（ ） 。
```
QDomNode QDomNamedNodeMap.namedItem (self, QString name)
```
[
返回称为节点_name_。
](qdomnode.html)
[如果指定的节点映射不包含这样的节点，](qdomnode.html)[null node](qdomnode.html#isNull)返回。节点的名称是返回的名称[QDomNode.nodeName](qdomnode.html#nodeName)（ ） 。
**See also** [setNamedItem](qdomnamednodemap.html#setNamedItem)（）和[namedItemNS](qdomnamednodemap.html#namedItemNS)（ ） 。
```
QDomNode QDomNamedNodeMap.namedItemNS (self, QString nsURI, QString localName)
```
[
返回与本地名称相关联的节点_localName_和命名空间URI_nsURI_。
](qdomnode.html)
[如果地图不包含这样一个节点，](qdomnode.html)[null node](qdomnode.html#isNull)返回。
**See also** [setNamedItemNS](qdomnamednodemap.html#setNamedItemNS)（）和[namedItem](qdomnamednodemap.html#namedItem)（ ） 。
```
QDomNode QDomNamedNodeMap.removeNamedItem (self, QString name)
```
[
所谓的删除节点_name_从地图。
](qdomnode.html)
[该函数返回删除节点或](qdomnode.html)[null node](qdomnode.html#isNull)如果映射不包含称为节点_name_。
**See also** [setNamedItem](qdomnamednodemap.html#setNamedItem)（ ）[namedItem](qdomnamednodemap.html#namedItem)（）和[removeNamedItemNS](qdomnamednodemap.html#removeNamedItemNS)（ ） 。
```
QDomNode QDomNamedNodeMap.removeNamedItemNS (self, QString nsURI, QString localName)
```
[
删除与本地名称的节点_localName_和命名空间URI_nsURI_从地图。
](qdomnode.html)
[该函数返回删除节点或](qdomnode.html)[null node](qdomnode.html#isNull)如果地图没有包含与本地名称的节点_localName_和命名空间URI_nsURI_。
**See also** [setNamedItemNS](qdomnamednodemap.html#setNamedItemNS)（ ）[namedItemNS](qdomnamednodemap.html#namedItemNS)（）和[removeNamedItem](qdomnamednodemap.html#removeNamedItem)（ ） 。
```
QDomNode QDomNamedNodeMap.setNamedItem (self, QDomNode newNode)
```
[](qdomnode.html)
[插入节点_newNode_放到指定的节点图。所使用的地图名称为的节点名称_newNode_所返回](qdomnode.html)[QDomNode.nodeName](qdomnode.html#nodeName)（ ） 。
如果新节点替换现有节点，即在地图包含具有相同名称的节点，则返回被替换节点。
**See also** [namedItem](qdomnamednodemap.html#namedItem)（ ）[removeNamedItem](qdomnamednodemap.html#removeNamedItem)（）和[setNamedItemNS](qdomnamednodemap.html#setNamedItemNS)（ ） 。
```
QDomNode QDomNamedNodeMap.setNamedItemNS (self, QDomNode newNode)
```
[
插入节点_newNode_在地图上。如果具有相同的命名空间URI和本地相同名称的节点已经存在于地图上，它被替换_newNode_。如果新节点替换现有节点，则返回被替换节点。
](qdomnode.html)
[**See also**](qdomnode.html) [namedItemNS](qdomnamednodemap.html#namedItemNS)（ ）[removeNamedItemNS](qdomnamednodemap.html#removeNamedItemNS)（）和[setNamedItem](qdomnamednodemap.html#setNamedItem)（ ） 。
```
int QDomNamedNodeMap.size (self)
```
这个功能是为Qt API的一致性。它相当于[length](qdomnamednodemap.html#length)（ ） 。
```
bool QDomNamedNodeMap.__eq__ (self, QDomNamedNodeMap)
```
```
QDomNamedNodeMap.__len__ (self)
```
```
bool QDomNamedNodeMap.__ne__ (self, QDomNamedNodeMap)
```
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- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference