# QXmlName Class Reference
## [[QtXmlPatterns](index.htm) module]
該QXmlName類表示一個XML節點的名稱，以高效，名稱空間感知的方式。[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
該QXmlName類表示一個XML節點的名稱，以高效，名稱空間感知的方式。
QXmlName代表的方式，是既有效又安全的比較名稱的XML節點的名稱。通常情況下，一個XML節點表示一個XML元素或屬性，但QXmlName還可以代表其它類型的節點，例如的名稱，[QAbstractXmlReceiver.processingInstruction](qabstractxmlreceiver.html#processingInstruction)（）和[QAbstractXmlReceiver.namespaceBinding](qabstractxmlreceiver.html#namespaceBinding)（ ） 。
一個XML節點的名稱有三個組件：_namespace URI_時，_local name_和_prefix_。要查看這些是指在XML中，考慮下面的代碼片斷。
```
<book xmlns:dc='http://purl.org/dc/elements/1.1'
xmlns='http://example.com/MyDefault'>
<dc:title>Mobey Dick</dc:title> ...
</book>
```
對于指定的元素_book_，[localName](qxmlname.html#localName)（）返回_book_，[namespaceUri](qxmlname.html#namespaceUri)（）返回_http://example.com/MyDefault_和[prefix](qxmlname.html#prefix)（ ）返回一個空字符串。對于指定的元素_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_。
以確保與QXmlName操作是有效的，例如，復印機的名稱和比較它們， QXmlName的每個實例都與一個相關聯的[name pool](qxmlnamepool.html)，必須在QXmlName施工時指定。該QXmlName的三個組成部分，即命名空間URI ，本地名稱，前綴，存儲在名稱池映射到標識符，使他們能夠共享。出于這個原因，創建QXmlName的有效實例的唯一方法是使用類的構造函數，其中[name pool](qxmlnamepool.html)，本地名稱，命名空間URI和前綴必須全部指定。
需要注意的是QXmlName的默認構造函數構造一個空實例。它通常用于在QXmlName集合分配未使用的條目。
QXmlName的每個實例有一個相關聯的副作用[name pool](qxmlnamepool.html)是QXmlName的每個實例是聯系在一起的[QXmlNamePool](qxmlnamepool.html)與創建它。然而， QXmlName類不跟蹤名稱池的，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)（ ）要求的正確名稱池被傳遞給他們。未能提供正確的名稱池這些訪問函數將導致不確定的行為。
請注意，一個[name pool](qxmlnamepool.html) is _not_XML命名空間。一[name pool](qxmlnamepool.html)可以代表從不同的XML命名空間QXmlName的實例， QXmlName從一個XML命名空間的實例可以被分布在多個[name pools](qxmlnamepool.html)。
### Comparing QXmlNames
要確定什么是QXmlName指的是，在_namespace URI_和_local name_被使用。該_prefix_不使用，因為前綴只是一種替代通常更長的命名空間URI的使用簡寫名稱。也不是名字比較中使用的前綴。例如，下面的兩個元素節點代表相同的元件，并比較相等。
```
<svg xmlns="http://www.w3.org/2000/svg"/>
```
```
<x:svg xmlns:x="http://www.w3.org/2000/svg"/>
```
雖然第二名稱的前綴_x_，這兩個名字比較相等的QXmlName的實例，因為該前綴未在比較中使用。
本地名不能為空字符串，雖然前綴和命名空間URI即可。如果前綴不為空，命名空間URI不能為空。本地名稱和前綴必須是有效的[NCNames](http://www.w3.org/TR/REC-xml-names/#NT-NCName)例如_abc.def_ or _abc123_。
QXmlName表示有時被稱為一個_expanded QName_，或者干脆一個QName 。
* * *
## Method Documentation
```
QXmlName.__init__ (self)
```
構造未初始化[QXmlName](qxmlname.html)。為了建立一個有效的[QXmlName](qxmlname.html)，您通常使用的其他構造函數，它接受一個[name pool](qxmlnamepool.html)，命名空間URI ，本地名稱和前綴作為參數。但你也可以使用這個構造函數來建立一個空[QXmlName](qxmlname.html)然后指定一個現有[QXmlName](qxmlname.html)到它。
**See also** [isNull](qxmlname.html#isNull)（ ） 。
```
QXmlName.__init__ (self, QXmlNamePool?namePool, QString?localName, QString?namespaceUri?=?QString(), QString?prefix?=?QString())
```
構造一個[QXmlName](qxmlname.html)實例插入_localName_，_namespaceURI_和_prefix_成_namePool_如果它們不存在。的訪問函數[namespaceUri](qxmlname.html#namespaceUri)（ ）[prefix](qxmlname.html#prefix)（ ）[localName](qxmlname.html#localName)（）和[toClarkName](qxmlname.html#toClarkName)（ ）必須通過_namePool_這里所用的，所以_namePool_必須保持在范圍內同時訪問函數可以被使用。然而，兩種情況可以與被比較_==_ or _!=_和復制無_namePool_。
用戶保證該字符串組件的有效期為一個QName 。特別地，本地名稱和前綴（如果有的話） ，必須有效[NCNames](http://www.w3.org/TR/REC-xml-names/#NT-NCName)。該功能[isNCName](qxmlname.html#isNCName)（）可以被用來測試這些名稱的有效性。命名空間URI應該是一個絕對URI 。[QUrl.isRelative](qurl.html#isRelative)（ ）可以被用來測試的命名空間URI是否是相對或絕對。最后，提供了一個前綴無效沒有命名空間URI提供時。
_namePool_不被復制。也不是參照它保留在該實例。這個構造函數插入三個字符串成_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_，并將其返回。
克拉克的名字是一個方式來呈現一個完整的QName只有一個字符串，其中的命名空間不能包含括號。下面是幾個例子：
| 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` |
如果命名空間包含括號，則返回值是無效或有不確定的內容。
If _clarkName_是無效的名稱，構造一個默認的[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`。一個`NCName`是，可以作為XML中的名稱和一個串[XQuery](index.htm)，例如，在一個元素或屬性，或一個變量的名稱的前綴或本地名稱。
**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)不具有有效的組合進行初始化_namespace URI_，_local name_和_prefix_。
一個有效的本地名稱始終是必需的。前綴和命名空間URI可以是空的，但如果前綴不為空，命名空間URI不能為空。本地名稱和前綴必須是有效的[NCNames](http://www.w3.org/TR/REC-xml-names/#NT-NCName)例如_abc.def_ or _abc123_。
```
QString QXmlName.localName (self, QXmlNamePool?query)
```
返回的本地名稱。
注意，為了提高效率，本地名稱字符串沒有存儲在[QXmlName](qxmlname.html)但在[QXmlNamePool](qxmlnamepool.html)被傳遞給構造函數。因此，同樣的_namePool_必須被傳遞給這個函數，因此它可以用于查找本地名稱。
```
QString QXmlName.namespaceUri (self, QXmlNamePool?query)
```
返回的命名空間URI 。
注意，為了提高效率，命名空間URI字符串沒有存儲在[QXmlName](qxmlname.html)但在[QXmlNamePool](qxmlnamepool.html)被傳遞給構造函數。因此，同樣的_namePool_必須被傳遞給這個函數，因此它可以用于查找命名空間URI 。
```
QString QXmlName.prefix (self, QXmlNamePool?query)
```
返回前綴。
注意，為了提高效率，前綴字符串沒有存儲在[QXmlName](qxmlname.html)但在[QXmlNamePool](qxmlnamepool.html)被傳遞給構造函數。因此，同樣的_namePool_必須被傳遞給該函數，因此它可用于查找的前綴。
```
QString QXmlName.toClarkName (self, QXmlNamePool?query)
```
返回此[QXmlName](qxmlname.html)格式化為一個克拉克名稱。舉例來說，如果本地名稱是`html`，前綴是`x`和命名空間URI為`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.
```
如果本地名稱是_MyWidget_和命名空間為空，則返回的克拉克的名字是：
```
MyWidget
```
需要注意的是為提高效率，命名空間URI ，本地名稱和前綴字符串不存儲在[QXmlName](qxmlname.html)但在[QXmlNamePool](qxmlnamepool.html)被傳遞給構造函數。因此，同樣的_namePool_必須被傳遞給該函數，因此它可用于查找三個字符串組成。
此功能可用于調試。
**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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- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
- QSessionManager Class Reference
- QSettings Class Reference
- QSharedMemory Class Reference
- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- 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文檔翻譯：Qt樣式單參考,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
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- QToolButton Class Reference
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- Reference
- QTransform Class Reference
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- QTreeView Class Reference
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- QUndoCommand Class Reference
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- QUrl Class Reference
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- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
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- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
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- QWebHitTestResult Class Reference
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- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
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- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
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- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
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- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
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- QXmlEntityResolver Class Reference
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- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
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- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
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- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
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- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference