PySide.QtXml.QDomImplementation class provides information about the features of the DOM implementation.
此类描述由 DOM 实现所支持的特征。目前支持 DOM 级别 1 和 DOM 级别 2 核心 XML 子集。
通常，使用函数 QDomDocument.implementation() to get the implementation object.
可以创建新的文档类型采用 PySide.QtXml.QDomImplementation.createDocumentType() and a new document with PySide.QtXml.QDomImplementation.createDocument() .
For further information about the Document Object Model see Level 1 and Level 2 Core. For a more general introduction of the DOM implementation see the PySide.QtXml.QDomDocument 文档编制。
The QDom classes have a few issues of nonconformance with the XML specifications that cannot be fixed in Qt 4 without breaking backward compatibility. The QtXmlPatterns module and the PySide.QtCore.QXmlStreamReader and PySide.QtCore.QXmlStreamWriter 类拥有更高一致性。
| 参数： | arg__1 – PySide.QtXml.QDomImplementation |
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构造 PySide.QtXml.QDomImplementation 对象。
构造副本为 x .
此枚举指定应做什么，当工厂函数在 PySide.QtXml.QDomDocument 被调用采用无效数据。
| 常量 | 描述 |
|---|---|
| QDomImplementation.AcceptInvalidChars | The data should be stored in the DOM object anyway. In this case the resulting XML document might not be well-formed. This is the default value and QDom's behavior in Qt < 4.1. |
| QDomImplementation.DropInvalidChars | 应从数据中移除无效字符。 |
| QDomImplementation.ReturnNullNode | 工厂函数应返回 null 节点。 |
| 参数： |
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| 返回类型： |
创建的 DOM (文档对象模型) 文档具有文档类型 doctype . This function also adds a root element node with the qualified name qName 和名称空间 URI nsURI .
| 参数： |
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| 返回类型： |
创建文档类型节点为名称 qName .
publicId specifies the public identifier of the external subset. If you specify an empty string ( QString() ) as the publicId , this means that the document type has no public identifier.
systemId specifies the system identifier of the external subset. If you specify an empty string as the systemId , this means that the document type has no system identifier.
Since you cannot have a public identifier without a system identifier, the public identifier is set to an empty string if there is no system identifier.
DOM level 2 does not support any other document type declaration features.
The only way you can use a document type that was created this way, is in combination with the PySide.QtXml.QDomImplementation.createDocument() function to create a PySide.QtXml.QDomDocument with this document type.
In the DOM specification, this is the only way to create a non-null document. For historical reasons, Qt also allows to create the document using the default empty constructor. The resulting document is null, but becomes non-null when a factory function, for example QDomDocument.createElement() , is called. The document also becomes non-null when setContent() is called.
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| 返回类型： |
PySide.QtCore.bool |
The function returns true if QDom implements the requested version of a feature ；否则返回 false。
目前支持的特征及其版本：
| Feature | 版本 |
| XML | 1.0 |
| 返回类型： | PySide.QtXml.QDomImplementation.InvalidDataPolicy |
|---|
Returns the invalid data policy, which specifies what should be done when a factory function in PySide.QtXml.QDomDocument is passed invalid data.
另请参阅
PySide.QtXml.QDomImplementation.setInvalidDataPolicy() QDomImplementation.InvalidDataPolicy
| 返回类型： | PySide.QtCore.bool |
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Returns false if the object was created by QDomDocument.implementation() ; otherwise returns true.
| 参数： | arg__1 – PySide.QtXml.QDomImplementation |
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| 返回类型： | PySide.QtCore.bool |
返回 true 若 x and this DOM implementation object were created from different QDomDocuments; otherwise returns false.
| 参数： | arg__1 – PySide.QtXml.QDomImplementation |
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| 返回类型： | PySide.QtCore.bool |
返回 true 若 x and this DOM implementation object were created from the same PySide.QtXml.QDomDocument ；否则返回 false。
| 参数： | policy – PySide.QtXml.QDomImplementation.InvalidDataPolicy |
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Sets the invalid data policy, which specifies what should be done when a factory function in PySide.QtXml.QDomDocument is passed invalid data.
policy is set for all instances of PySide.QtXml.QDomDocument which already exist and which will be created in the future.
doc = QDomDocument()
impl = QDomImplementation()
# This will create the element, but the resulting XML document will
# be invalid, because '~' is not a valid character in a tag name.
impl.setInvalidDataPolicy(QDomImplementation.AcceptInvalidData)
elt1 = doc.createElement("foo~bar")
# This will create an element with the tag name "foobar".
impl.setInvalidDataPolicy(QDomImplementation.DropInvalidData)
elt2 = doc.createElement("foo~bar")
# This will create a null element.
impl.setInvalidDataPolicy(QDomImplementation::ReturnNullNode)
elt3 = doc.createElement("foo~bar")
另请参阅
PySide.QtXml.QDomImplementation.invalidDataPolicy() QDomImplementation.InvalidDataPolicy