QDomImplementation ¶

概要 ¶

详细描述 ¶

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 implementation() to get the implementation object.

可以创建新的文档类型采用 createDocumentType() and a new document with createDocument() .

有关文档对象模型的进一步信息，见 级别 1 and 级别 2 核心 。有关 DOM 实现的更一般介绍，见 QDomDocument 文档编制。

QDom 类有一些不符合 XML 规范的问题，Qt 4 无法在不破坏向后兼容性的情况下修复这些问题。Qt XML 模式模块和 QXmlStreamReader and QXmlStreamWriter 类拥有更高一致性。

另请参阅

hasFeature()

class QDomImplementation ¶

QDomImplementation(arg__1)

param arg__1

QDomImplementation

构造 QDomImplementation 对象。

PySide2.QtXml.QDomImplementation. InvalidDataPolicy ¶

此枚举指定应做什么，当工厂函数在 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。

另请参阅

setInvalidDataPolicy() invalidDataPolicy()

PySide2.QtXml.QDomImplementation. createDocument ( nsURI , qName , doctype ) ¶

参数

• nsURI – unicode

• qName – unicode

• doctype – QDomDocumentType

返回类型

QDomDocument

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 .

PySide2.QtXml.QDomImplementation. createDocumentType ( qName , publicId , systemId ) ¶

参数

• qName – unicode

• publicId – unicode

• systemId – unicode

返回类型

QDomDocumentType

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 createDocument() function to create a 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 createElement() , is called. The document also becomes non-null when setContent() is called.

另请参阅

createDocument()

PySide2.QtXml.QDomImplementation. hasFeature ( feature , version ) ¶

参数

• feature – unicode

• version – unicode

返回类型

bool

函数返回 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

static PySide2.QtXml.QDomImplementation. invalidDataPolicy ( ) ¶

返回类型

InvalidDataPolicy

Returns the invalid data policy, which specifies what should be done when a factory function in QDomDocument is passed invalid data.

另请参阅

setInvalidDataPolicy() InvalidDataPolicy

PySide2.QtXml.QDomImplementation. isNull ( ) ¶

返回类型

bool

返回 false 如果对象被创建由 implementation() ；否则返回 true .

PySide2.QtXml.QDomImplementation. __ne__ ( arg__1 ) ¶

参数

arg__1 – QDomImplementation

返回类型

bool

返回 true if x and this DOM implementation object were created from different QDomDocuments; otherwise returns false .

PySide2.QtXml.QDomImplementation. __eq__ ( arg__1 ) ¶

参数

arg__1 – QDomImplementation

返回类型

bool

返回 true if x and this DOM implementation object were created from the same QDomDocument ；否则返回 false .

static PySide2.QtXml.QDomImplementation. setInvalidDataPolicy ( policy ) ¶

参数

policy – InvalidDataPolicy

Sets the invalid data policy, which specifies what should be done when a factory function in QDomDocument is passed invalid data.

policy is set for all instances of 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

invalidDataPolicy() InvalidDataPolicy