# QAbstractXmlReceiver Class Reference
## [[QtXmlPatterns](index.htm) module]
该QAbstractXmlReceiver类提供了一个回调接口，用于将一个输出[QXmlQuery](qxmlquery.html)。[More...](#details)
通过继承[QXmlSerializer](qxmlserializer.html)。
### Methods
* `__init__ (self)`
* `atomicValue (self, QVariant value)`
* `attribute (self, QXmlName name, QStringRef value)`
* `characters (self, QStringRef value)`
* `comment (self, QString value)`
* `endDocument (self)`
* `endElement (self)`
* `endOfSequence (self)`
* `namespaceBinding (self, QXmlName name)`
* `processingInstruction (self, QXmlName target, QString value)`
* `startDocument (self)`
* `startElement (self, QXmlName name)`
* `startOfSequence (self)`
* * *
## Detailed Description
该QAbstractXmlReceiver类提供了一个回调接口，用于将一个输出[QXmlQuery](qxmlquery.html)。
QAbstractXmlReceiver是提供一个回调接口的抽象基类，用于接收[XQuery sequence](#xquery-sequence)，一个通常的输出[QXmlQuery](qxmlquery.html)和转化的顺序为您选择，通常是XML的结构。考虑例子：
```
[QXmlQuery](qxmlquery.html) query;
query.setQuery("doc('index.html')/html/body/p[1]");
[QXmlSerializer](qxmlserializer.html) serializer(query, myOutputDevice);
query.evaluateTo(&serializer);
```
首先它构造一个[query](qxmlquery.html)这会从文档的第一段`index.html`。然后，它构造了一个[XML serializer](qxmlserializer.html)与[query](qxmlquery.html)和[myOutputDevice](qiodevice.html)（请注意[serializer](qxmlserializer.html)是_XML receiver_，即QAbstractXmlReceiver的一个子类） 。最后，它[evaluates](qxmlquery.html#evaluateTo)该[query](qxmlquery.html)，生产调用的有序序列[serializer's](qxmlserializer.html)回调函数。回调的序列转换查询输出到XML ，并将其写入到[myOutputDevice](qiodevice.html)。
虽然该示例使用[QXmlQuery](qxmlquery.html)产生回调到QAbstractXmlReceiver功能的序列，可以直接，只要你的电话的序列代表一个有效的调用回调函数[XQuery sequence](#xquery-sequence)。
### XQuery Sequences
一个[XQuery](index.htm) _sequence_是零的有序集合，一个或多个_items_。每_item_或者是一个_atomic value_或_node_。一个_atomic value_是一个简单的数据值。
有6种_nodes_。
* An _Element Node_ represents an XML element.
* An _Attribute Node_ represents an XML attribute.
* A _Document Node_ represents an entire XML document.
* A _Text Node_ represents character data (element content).
* A _Processing Instruction Node_ represents an XML processing instruction, which is used in an XML document to tell the application reading the document to perform some action. A typical example is to use a processing instruction to tell the application to use a particular XSLT stylesheet to display the document.
* And a _Comment node_ represents an XML comment.
该_sequence_的_nodes_和_atomic values_遵循以下规则。需要注意的是_Namespace Node_指的是一种特殊的_Attribute Node_与名_xmlns_。
* Each _node_ appears in the _sequence_ before its children and their descendants appear.
* A _node_'s descendants appear in the _sequence_ before any of its siblings appear.
* A _Document Node_ represents an entire document. Zero or more _Document Nodes_ can appear in a _sequence_, but they can only be top level items (i.e., a _Document Node_ can't be a child of another _node_.
* _Namespace Nodes_ immediately follow the _Element Node_ with which they are associated.
* _Attribute Nodes_ immediately follow the _Namespace Nodes_ of the element with which they are associated, or...
* If there are no _Namespace Nodes_ following an element, then the _Attribute Nodes_ immediately follow the element.
* An _atomic value_ can only appear as a top level _item_, i.e., it can't appear as a child of a _node_.
* _Processing Instruction Nodes_ do not have children, and their parent is either a _Document Node_ or an _Element Node_.
* _Comment Nodes_ do not have children, and their parent is either a _Document Node_ or an _Element Node_.
该_sequence_的_nodes_和_atomic values_被发送到一个QAbstractXmlReceiver （[QXmlSerializer](qxmlserializer.html)在上面的例子）作为呼叫接收器的回调函数的序列。的回调函数序列的项目的映射如下。
* [startDocument](qabstractxmlreceiver.html#startDocument)() and [endDocument](qabstractxmlreceiver.html#endDocument)() are called for each _Document Node_ in the _sequence_. [endDocument](qabstractxmlreceiver.html#endDocument)() is not called until all the _Document Node's_ children have appeared in the _sequence_.
* [startElement](qabstractxmlreceiver.html#startElement)() and [endElement](qabstractxmlreceiver.html#endElement)() are called for each _Element Node_. [endElement](qabstractxmlreceiver.html#endElement)() is not called until all the _Element Node's_ children have appeared in the _sequence_.
* [attribute](qabstractxmlreceiver.html#attributex)() is called for each _Attribute Node_.
* [comment](qabstractxmlreceiver.html#comment)() is called for each _Comment Node_.
* [characters](qabstractxmlreceiver.html#characters)() is called for each _Text Node_.
* [processingInstruction](qabstractxmlreceiver.html#processingInstruction)() is called for each _Processing Instruction Node_.
* [namespaceBinding](qabstractxmlreceiver.html#namespaceBinding)() is called for each _Namespace Node_.
* [atomicValue](qabstractxmlreceiver.html#atomicValue)() is called for each _atomic value_.
对于一个完整的解释[XQuery](index.htm)序列，请访问[XQuery Data Model](http://www.w3.org/TR/xpath-datamodel/)。
* * *
## Method Documentation
```
QAbstractXmlReceiver.__init__ (self)
```
构造一个抽象的XML接收器。
```
QAbstractXmlReceiver.atomicValue (self, QVariant value)
```
这种方法是抽象的，应在任何子类中重新实现。
当一个原子值出现在这个回调函数被调用[sequence](qabstractxmlreceiver.html#xquery-sequence)。该_value_是一个简单的[data value](qvariant.html)。它是保证[valid](qvariant.html#isValid)。
```
QAbstractXmlReceiver.attribute (self, QXmlName name, QStringRef value)
```
这种方法是抽象的，应在任何子类中重新实现。
```
QAbstractXmlReceiver.characters (self, QStringRef value)
```
这种方法是抽象的，应在任何子类中重新实现。
当一个文本节点会出现在这个回调函数被调用[sequence](qabstractxmlreceiver.html#xquery-sequence)。该_value_包含的文本。相邻的文本节点可能不会出现在[sequence](qabstractxmlreceiver.html#xquery-sequence)，也就是说，这个回调不能说是连续两次。
```
QAbstractXmlReceiver.comment (self, QString value)
```
这种方法是抽象的，应在任何子类中重新实现。
当一个注释节点会出现在这个回调函数被调用[sequence](qabstractxmlreceiver.html#xquery-sequence)。该_value_是注释文本，其中不得包含字符串“ - ” 。
```
QAbstractXmlReceiver.endDocument (self)
```
这种方法是抽象的，应在任何子类中重新实现。
当一个文档节点的末尾会出现在这个回调函数被调用[sequence](qabstractxmlreceiver.html#xquery-sequence)。
```
QAbstractXmlReceiver.endElement (self)
```
这种方法是抽象的，应在任何子类中重新实现。
当一个元素节点的结尾会出现在这个回调函数被调用[sequence](qabstractxmlreceiver.html#xquery-sequence)。
```
QAbstractXmlReceiver.endOfSequence (self)
```
这种方法是抽象的，应在任何子类中重新实现。
此回调被调用一次只，右后[sequence](qabstractxmlreceiver.html#xquery-sequence)结束。
```
QAbstractXmlReceiver.namespaceBinding (self, QXmlName name)
```
这种方法是抽象的，应在任何子类中重新实现。
此回调被调用时，一个命名空间绑定在元素的范围。命名空间是由一个URI来定义。在[QXmlName](qxmlname.html) _name_，的值[QXmlName.namespaceUri](qxmlname.html#namespaceUri)（）是URI。价值[QXmlName.prefix](qxmlname.html#prefix)（）是该URI被绑定到前缀。本地名称是微不足道的，可以是任意值。
```
QAbstractXmlReceiver.processingInstruction (self, QXmlName target, QString value)
```
这种方法是抽象的，应在任何子类中重新实现。
当一个处理指令出现在此回调被调用[sequence](qabstractxmlreceiver.html#xquery-sequence)。处理指令用于在XML文档中告诉应用程序读取文件执行某些操作。一个典型的例子是使用处理指令来告诉应用程序使用特定的XSLT样式表来处理文档。
```
<?xml-stylesheet type="test/xsl" href="formatter.xsl"?>
```
_target_是[name](qxmlname.html)的处理指令。其_prefix_和_namespace URI_必须都是空的。其_local name_是目标。在上面的例子中，域名是_xml-stylesheet_。
该_value_指定要采取的行动。注意，这个_value_不得包含字符串“ \u003e ” 。在上面的例子中，_value_ is _type="test/xsl" href="formatter.xsl_。
一般情况下，应避免使用处理指令，因为他们没有意识到命名空间和在许多情况下被剥离出来呢。处理指令通常可以替换为一个自定义的命名空间的元素。
```
QAbstractXmlReceiver.startDocument (self)
```
这种方法是抽象的，应在任何子类中重新实现。
当一个文档节点出现在这个回调函数被调用[sequence](qabstractxmlreceiver.html#xquery-sequence)。
```
QAbstractXmlReceiver.startElement (self, QXmlName name)
```
这种方法是抽象的，应在任何子类中重新实现。
当一个新的元素节点出现在这个回调函数被调用[sequence](qabstractxmlreceiver.html#xquery-sequence)。_name_是有效[name](qxmlname.html)该节点的元素。
```
QAbstractXmlReceiver.startOfSequence (self)
```
这种方法是抽象的，应在任何子类中重新实现。
此回调被调用一次而已，正确的前[sequence](qabstractxmlreceiver.html#xquery-sequence)开始。
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- 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