# QXmlName Class Reference
## [[QtXmlPatterns](index.htm) module]
该QXmlName类表示一个XML节点的名称，以高效，名称空间感知的方式。[More...](#details)
### Methods
* `__init__ (self)`
* `__init__ (self, QXmlNamePool namePool, QString localName, QString namespaceUri = QString(), QString prefix = QString())`
* `__init__ (self, QXmlName)`
* `bool isNull (self)`
* `QString localName (self, QXmlNamePool query)`
* `QString namespaceUri (self, QXmlNamePool query)`
* `QString prefix (self, QXmlNamePool query)`
* `QString toClarkName (self, QXmlNamePool query)`
### Static Methods
* `QXmlName fromClarkName (QString clarkName, QXmlNamePool namePool)`
* `bool isNCName (QString candidate)`
### Special Methods
* `bool __eq__ (self, QXmlName other)`
* `int __hash__ (self)`
* `bool __ne__ (self, QXmlName other)`
* * *
## Detailed Description
该QXmlName类表示一个XML节点的名称，以高效，名称空间感知的方式。
QXmlName代表的方式，是既有效又安全的比较名称的XML节点的名称。通常情况下，一个XML节点表示一个XML元素或属性，但QXmlName还可以代表其它类型的节点，例如的名称，[QAbstractXmlReceiver.processingInstruction](qabstractxmlreceiver.html#processingInstruction)（）和[QAbstractXmlReceiver.namespaceBinding](qabstractxmlreceiver.html#namespaceBinding)（ ） 。
一个XML节点的名称有三个组件：_namespace URI_时，_local name_和_prefix_。要查看这些是指在XML中，考虑下面的代码片断。
```
<book xmlns:dc='http://purl.org/dc/elements/1.1'
xmlns='http://example.com/MyDefault'>
<dc:title>Mobey Dick</dc:title> ...
</book>
```
对于指定的元素_book_，[localName](qxmlname.html#localName)（）返回_book_，[namespaceUri](qxmlname.html#namespaceUri)（）返回_http://example.com/MyDefault_和[prefix](qxmlname.html#prefix)（ ）返回一个空字符串。对于指定的元素_title_，[localName](qxmlname.html#localName)（）返回_title_，[namespaceUri](qxmlname.html#namespaceUri)（）返回_http://purl.org/dc/elements/1.1_和[prefix](qxmlname.html#prefix)（）返回_dc_。
以确保与QXmlName操作是有效的，例如，复印机的名称和比较它们， QXmlName的每个实例都与一个相关联的[name pool](qxmlnamepool.html)，必须在QXmlName施工时指定。该QXmlName的三个组成部分，即命名空间URI ，本地名称，前缀，存储在名称池映射到标识符，使他们能够共享。出于这个原因，创建QXmlName的有效实例的唯一方法是使用类的构造函数，其中[name pool](qxmlnamepool.html)，本地名称，命名空间URI和前缀必须全部指定。
需要注意的是QXmlName的默认构造函数构造一个空实例。它通常用于在QXmlName集合分配未使用的条目。
QXmlName的每个实例有一个相关联的副作用[name pool](qxmlnamepool.html)是QXmlName的每个实例是联系在一起的[QXmlNamePool](qxmlnamepool.html)与创建它。然而， QXmlName类不跟踪名称池的，所以所有的存取功能，例如，[namespaceUri](qxmlname.html#namespaceUri)（ ）[prefix](qxmlname.html#prefix)（ ）[localName](qxmlname.html#localName)（）和[toClarkName](qxmlname.html#toClarkName)（ ）要求的正确名称池被传递给他们。未能提供正确的名称池这些访问函数将导致不确定的行为。
请注意，一个[name pool](qxmlnamepool.html) is _not_XML命名空间。一[name pool](qxmlnamepool.html)可以代表从不同的XML命名空间QXmlName的实例， QXmlName从一个XML命名空间的实例可以被分布在多个[name pools](qxmlnamepool.html)。
### Comparing QXmlNames
要确定什么是QXmlName指的是，在_namespace URI_和_local name_被使用。该_prefix_不使用，因为前缀只是一种替代通常更长的命名空间URI的使用简写名称。也不是名字比较中使用的前缀。例如，下面的两个元素节点代表相同的元件，并比较相等。
```
<svg xmlns="http://www.w3.org/2000/svg"/>
```
```
<x:svg xmlns:x="http://www.w3.org/2000/svg"/>
```
虽然第二名称的前缀_x_，这两个名字比较相等的QXmlName的实例，因为该前缀未在比较中使用。
本地名不能为空字符串，虽然前缀和命名空间URI即可。如果前缀不为空，命名空间URI不能为空。本地名称和前缀必须是有效的[NCNames](http://www.w3.org/TR/REC-xml-names/#NT-NCName)例如_abc.def_ or _abc123_。
QXmlName表示有时被称为一个_expanded QName_，或者干脆一个QName 。
* * *
## Method Documentation
```
QXmlName.__init__ (self)
```
构造未初始化[QXmlName](qxmlname.html)。为了建立一个有效的[QXmlName](qxmlname.html)，您通常使用的其他构造函数，它接受一个[name pool](qxmlnamepool.html)，命名空间URI ，本地名称和前缀作为参数。但你也可以使用这个构造函数来建立一个空[QXmlName](qxmlname.html)然后指定一个现有[QXmlName](qxmlname.html)到它。
**See also** [isNull](qxmlname.html#isNull)（ ） 。
```
QXmlName.__init__ (self, QXmlNamePool namePool, QString localName, QString namespaceUri = QString(), QString prefix = QString())
```
构造一个[QXmlName](qxmlname.html)实例插入_localName_，_namespaceURI_和_prefix_成_namePool_如果它们不存在。的访问函数[namespaceUri](qxmlname.html#namespaceUri)（ ）[prefix](qxmlname.html#prefix)（ ）[localName](qxmlname.html#localName)（）和[toClarkName](qxmlname.html#toClarkName)（ ）必须通过_namePool_这里所用的，所以_namePool_必须保持在范围内同时访问函数可以被使用。然而，两种情况可以与被比较_==_ or _!=_和复制无_namePool_。
用户保证该字符串组件的有效期为一个QName 。特别地，本地名称和前缀（如果有的话） ，必须有效[NCNames](http://www.w3.org/TR/REC-xml-names/#NT-NCName)。该功能[isNCName](qxmlname.html#isNCName)（）可以被用来测试这些名称的有效性。命名空间URI应该是一个绝对URI 。[QUrl.isRelative](qurl.html#isRelative)（ ）可以被用来测试的命名空间URI是否是相对或绝对。最后，提供了一个前缀无效没有命名空间URI提供时。
_namePool_不被复制。也不是参照它保留在该实例。这个构造函数插入三个字符串成_namePool_。
```
QXmlName.__init__ (self, QXmlName)
```
```
QXmlName QXmlName.fromClarkName (QString clarkName, QXmlNamePool namePool)
```
[](qxmlname.html)
[皈依_clarkName_成](qxmlname.html)[QXmlName](qxmlname.html)，插入到_namePool_，并将其返回。
克拉克的名字是一个方式来呈现一个完整的QName只有一个字符串，其中的命名空间不能包含括号。下面是几个例子：
| Clark Name | Description |
| --- | --- |
| `html` | The local name `html`, in no namespace |
| `http://www.w3.org/1999/xhtml`html | The local name `html`, in the XHTML namespace |
| `http://www.w3.org/1999/xhtml`my:html | The local name `html`, in the XHTML namespace, with the prefix `my` |
如果命名空间包含括号，则返回值是无效或有不确定的内容。
If _clarkName_是无效的名称，构造一个默认的[QXmlName](qxmlname.html)返回。
此功能被引入Qt的4.5 。
**See also** [toClarkName](qxmlname.html#toClarkName)（ ） 。
```
bool QXmlName.isNCName (QString candidate)
```
返回True如果_candidate_是`NCName`。一个`NCName`是，可以作为XML中的名称和一个串[XQuery](index.htm)，例如，在一个元素或属性，或一个变量的名称的前缀或本地名称。
**See also** [Namespaces in XML 1.0 (Second Edition), [4] NCName](http://www.w3.org/TR/REC-xml-names/#NT-NCName)。
```
bool QXmlName.isNull (self)
```
返回True如果[QXmlName](qxmlname.html)不具有有效的组合进行初始化_namespace URI_，_local name_和_prefix_。
一个有效的本地名称始终是必需的。前缀和命名空间URI可以是空的，但如果前缀不为空，命名空间URI不能为空。本地名称和前缀必须是有效的[NCNames](http://www.w3.org/TR/REC-xml-names/#NT-NCName)例如_abc.def_ or _abc123_。
```
QString QXmlName.localName (self, QXmlNamePool query)
```
返回的本地名称。
注意，为了提高效率，本地名称字符串没有存储在[QXmlName](qxmlname.html)但在[QXmlNamePool](qxmlnamepool.html)被传递给构造函数。因此，同样的_namePool_必须被传递给这个函数，因此它可以用于查找本地名称。
```
QString QXmlName.namespaceUri (self, QXmlNamePool query)
```
返回的命名空间URI 。
注意，为了提高效率，命名空间URI字符串没有存储在[QXmlName](qxmlname.html)但在[QXmlNamePool](qxmlnamepool.html)被传递给构造函数。因此，同样的_namePool_必须被传递给这个函数，因此它可以用于查找命名空间URI 。
```
QString QXmlName.prefix (self, QXmlNamePool query)
```
返回前缀。
注意，为了提高效率，前缀字符串没有存储在[QXmlName](qxmlname.html)但在[QXmlNamePool](qxmlnamepool.html)被传递给构造函数。因此，同样的_namePool_必须被传递给该函数，因此它可用于查找的前缀。
```
QString QXmlName.toClarkName (self, QXmlNamePool query)
```
返回此[QXmlName](qxmlname.html)格式化为一个克拉克名称。举例来说，如果本地名称是`html`，前缀是`x`和命名空间URI为`http://www.w3.org/1999/xhtml/`，那么返回的克拉克的名字是：
```
{http://www.w3.org/1999/xhtml/}x:html.
```
如果本地名称是_MyWidget_和命名空间为空，则返回的克拉克的名字是：
```
MyWidget
```
需要注意的是为提高效率，命名空间URI ，本地名称和前缀字符串不存储在[QXmlName](qxmlname.html)但在[QXmlNamePool](qxmlnamepool.html)被传递给构造函数。因此，同样的_namePool_必须被传递给该函数，因此它可用于查找三个字符串组成。
此功能可用于调试。
**See also** [XML Namespaces, James Clark](http://www.jclark.com/xml/xmlns.htm)和[fromClarkName](qxmlname.html#fromClarkName)（ ） 。
```
bool QXmlName.__eq__ (self, QXmlName other)
```
```
int QXmlName.__hash__ (self)
```
```
bool QXmlName.__ne__ (self, QXmlName other)
```
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- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译：Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- 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