# QXmlSchema Class Reference
## [[QtXmlPatterns](index.htm) module]
该QXmlSchema类提供了一个W3C XML模式的加载和验证。[More...](#details)
### Methods
* `__init__ (self)`
* `QUrl documentUri (self)`
* `bool isValid (self)`
* `bool load (self, QUrl source)`
* `bool load (self, QIODevice source, QUrl documentUri = QUrl())`
* `bool load (self, QByteArray data, QUrl documentUri = QUrl())`
* `QAbstractMessageHandler messageHandler (self)`
* `QXmlNamePool namePool (self)`
* `QNetworkAccessManager networkAccessManager (self)`
* `setMessageHandler (self, QAbstractMessageHandler handler)`
* `setNetworkAccessManager (self, QNetworkAccessManager networkmanager)`
* `setUriResolver (self, QAbstractUriResolver resolver)`
* `QAbstractUriResolver uriResolver (self)`
* * *
## Detailed Description
该QXmlSchema类提供了一个W3C XML模式的加载和验证。
该QXmlSchema类加载，编译和验证，可以进一步通过用于XML实例文档验证的W3C XML Schema文件[QXmlSchemaValidator](qxmlschemavalidator.html)。
下面的示例演示如何从网络加载一个XML Schema文件，并测试它是否是一个有效的架构文档：
```
[QUrl](qurl.html) url("http://www.schema-example.org/myschema.xsd");
QXmlSchema schema;
if (schema.load(url) == true)
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
```
### XML Schema Version
这个类是用来表示符合的模式[XML Schema](http://www.w3.org/XML/Schema)1.0规范。
* * *
## Method Documentation
```
QXmlSchema.__init__ (self)
```
构造不能使用，直到无效，空架构[load](qxmlschema.html#load)（）被调用。
```
QUrl QXmlSchema.documentUri (self)
```
[
返回架构的文档URI或空的URI ，如果没有模式已定。
```
bool QXmlSchema.isValid (self)
```
返回True如果这个模式是有效的。失效模式的例子是那些包含语法错误或不符合W3C的XML Schema规范。
```
bool QXmlSchema.load (self, QUrl source)
```
](qurl.html)
[此套](qurl.html)[QXmlSchema](qxmlschema.html)以从加载的模式_source_URI。
如果架构[is invalid](qxmlschema.html#isValid)，`false`返回和行为是未定义的。
例如：
```
[QUrl](qurl.html) url("http://www.schema-example.org/myschema.xsd");
[QXmlSchema](qxmlschema.html) schema;
if (schema.load(url) == true)
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
```
**See also** [isValid](qxmlschema.html#isValid)（ ） 。
```
bool QXmlSchema.load (self, QIODevice source, QUrl documentUri = QUrl())
```
此套[QXmlSchema](qxmlschema.html)从读取架构_source_设备。该设备必须已经打开了至少[QIODevice.ReadOnly](qiodevice.html#OpenModeFlag-enum)。
_documentUri_表示从所获得的模式_source_设备。它是架构的基础URI，它在内部使用，以解决出现在架构相对URI ，以及消息的报告。
If _source_ is `null`或无法读取，或者如果_documentUri_是不是一个有效的URI ，行为是未定义的。
如果架构[is invalid](qxmlschema.html#isValid)，`false`返回和行为是未定义的。
例如：
```
[QFile](qfile.html) file("myschema.xsd");
file.open([QIODevice](qiodevice.html).ReadOnly);
[QXmlSchema](qxmlschema.html) schema;
schema.load(&file, [QUrl](qurl.html).fromLocalFile(file.fileName()));
if (schema.isValid())
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
```
**See also** [isValid](qxmlschema.html#isValid)（ ） 。
```
bool QXmlSchema.load (self, QByteArray data, QUrl documentUri = QUrl())
```
此套[QXmlSchema](qxmlschema.html)从读取架构_data_
_documentUri_表示从所获得的模式_data_。它是架构的基础URI，它在内部使用，以解决出现在架构相对URI ，以及消息的报告。
If _documentUri_是不是一个有效的URI ，行为是未定义的。
如果架构[is invalid](qxmlschema.html#isValid)，`false`返回和行为是未定义的。
例如：
```
[QByteArray](qbytearray.html) data( "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
"<xsd:schema"
" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""
" xmlns=\"http://qt.nokia.com/xmlschematest\""
" targetNamespace=\"http://qt.nokia.com/xmlschematest\""
" version=\"1.0\""
" elementFormDefault=\"qualified\">"
"</xsd:schema>" );
[QXmlSchema](qxmlschema.html) schema;
schema.load(data);
if (schema.isValid())
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
```
**See also** [isValid](qxmlschema.html#isValid)（）和[isValid](qxmlschema.html#isValid)（ ） 。
```
QAbstractMessageHandler QXmlSchema.messageHandler (self)
```
[](qabstractmessagehandler.html)
[返回处理这个编译和验证消息的消息处理程序](qabstractmessagehandler.html)[QXmlSchema](qxmlschema.html)。
**See also** [setMessageHandler](qxmlschema.html#setMessageHandler)（ ） 。
```
QXmlNamePool QXmlSchema.namePool (self)
```
[](qxmlnamepool.html)
[返回此名称池](qxmlnamepool.html)[QXmlSchema](qxmlschema.html)构建[names](qxmlname.html)。有没有setter的名字池，因为混合池的名称会导致错误，由于名称的混乱。
```
QNetworkAccessManager QXmlSchema.networkAccessManager (self)
```
[
返回该网络管理器，或0 ，如果它没有被设置。
](qnetworkaccessmanager.html)
[**See also**](qnetworkaccessmanager.html) [setNetworkAccessManager](qxmlschema.html#setNetworkAccessManager)（ ） 。
```
QXmlSchema.setMessageHandler (self, QAbstractMessageHandler handler)
```
更改[message handler](qabstractmessagehandler.html)这[QXmlSchema](qxmlschema.html)至_handler_。该架构将所有的编译和验证消息，此消息处理程序。[QXmlSchema](qxmlschema.html)不采取所有权_handler_。
通常情况下，默认的消息处理就足够了。它写的编译和验证消息的_stderr_。默认的消息处理程序，包括颜色代码，如果_stderr_可以使色彩。
When [QXmlSchema](qxmlschema.html)电话[QAbstractMessageHandler.message](qabstractmessagehandler.html#message)（ ） ，参数如下：
| message() argument | Semantics |
| --- | --- |
| [QtMsgType](index.htm#QtMsgType-enum) type | Only [QtWarningMsg](index.htm#QtMsgType-enum) and [QtFatalMsg](index.htm#QtMsgType-enum) are used. The former identifies a warning, while the latter identifies an error. |
| const [QString](qstring.html) & description | An XHTML document which is the actual message. It is translated into the current language. |
| const [QUrl](qurl.html) &identifier | Identifies the error with a URI, where the fragment is the error code, and the rest of the URI is the error namespace. |
| const [QSourceLocation](qsourcelocation.html) & sourceLocation | Identifies where the error occurred. |
**See also** [messageHandler](qxmlschema.html#messageHandler)（ ） 。
```
QXmlSchema.setNetworkAccessManager (self, QNetworkAccessManager networkmanager)
```
设置网络管理员_manager_。[QXmlSchema](qxmlschema.html)不采取所有权_manager_。
**See also** [networkAccessManager](qxmlschema.html#networkAccessManager)（ ） 。
```
QXmlSchema.setUriResolver (self, QAbstractUriResolver resolver)
```
设置的URI解析器_resolver_。[QXmlSchema](qxmlschema.html)不采取所有权_resolver_。
**See also** [uriResolver](qxmlschema.html#uriResolver)（ ） 。
```
QAbstractUriResolver QXmlSchema.uriResolver (self)
```
[](qabstracturiresolver.html)
[返回架构的URI解析器。如果没有的URI解析器已定，](qabstracturiresolver.html)[QtXmlPatterns](index.htm)将使用的URI的模式，因为它们。
这个URI解析器提供了一个抽象层，或_polymorphic URIs_。解析器可以重写_logical_URI与物理的，或者它可以翻译过时的或无效的URI来有效的。
When [QtXmlPatterns](index.htm)电话[QAbstractUriResolver.resolve](qabstracturiresolver.html#resolve)（ ）的绝对URI是由架构规范规定的URI和相对URI是由用户指定的URI。
**See also** [setUriResolver](qxmlschema.html#setUriResolver)（ ） 。
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- 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