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QDomImplementation

Synopsis

Functions

Static functions

Detailed Description

The PySide.QtXml.QDomImplementation class provides information about the features of the DOM implementation.

This class describes the features that are supported by the DOM implementation. Currently the XML subset of DOM Level 1 and DOM Level 2 Core are supported.

Normally you will use the function QDomDocument.implementation() to get the implementation object.

You can create a new document type with 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 documentation.

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 classes have a higher degree of a conformance.

See also

PySide.QtXml.QDomImplementation.hasFeature()

class PySide.QtXml.QDomImplementation
class PySide.QtXml.QDomImplementation(arg__1)
Parameters:arg__1 – PySide.QtXml.QDomImplementation

Constructs a PySide.QtXml.QDomImplementation object.

Constructs a copy of x .

PySide.QtXml.QDomImplementation.InvalidDataPolicy

This enum specifies what should be done when a factory function in PySide.QtXml.QDomDocument is called with invalid data.

Constant Description
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 The invalid characters should be removed from the data.
QDomImplementation.ReturnNullNode The factory function should return a null node.

See also

PySide.QtXml.QDomImplementation.setInvalidDataPolicy() PySide.QtXml.QDomImplementation.invalidDataPolicy()

PySide.QtXml.QDomImplementation.createDocument(nsURI, qName, doctype)
Parameters:
Return type:

PySide.QtXml.QDomDocument

Creates a DOM document with the document type doctype . This function also adds a root element node with the qualified name qName and the namespace URI nsURI .

PySide.QtXml.QDomImplementation.createDocumentType(qName, publicId, systemId)
Parameters:
  • qName – unicode
  • publicId – unicode
  • systemId – unicode
Return type:

PySide.QtXml.QDomDocumentType

Creates a document type node for the name 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.

See also

PySide.QtXml.QDomImplementation.createDocument()

PySide.QtXml.QDomImplementation.hasFeature(feature, version)
Parameters:
  • feature – unicode
  • version – unicode
Return type:

PySide.QtCore.bool

The function returns true if QDom implements the requested version of a feature ; otherwise returns false.

The currently supported features and their versions:

Feature Version
XML 1.0
static PySide.QtXml.QDomImplementation.invalidDataPolicy()
Return type: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.

See also

PySide.QtXml.QDomImplementation.setInvalidDataPolicy() QDomImplementation.InvalidDataPolicy

PySide.QtXml.QDomImplementation.isNull()
Return type:PySide.QtCore.bool

Returns false if the object was created by QDomDocument.implementation() ; otherwise returns true.

PySide.QtXml.QDomImplementation.__ne__(arg__1)
Parameters:arg__1 – PySide.QtXml.QDomImplementation
Return type:PySide.QtCore.bool

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

PySide.QtXml.QDomImplementation.__eq__(arg__1)
Parameters:arg__1 – PySide.QtXml.QDomImplementation
Return type:PySide.QtCore.bool

Returns true if x and this DOM implementation object were created from the same PySide.QtXml.QDomDocument ; otherwise returns false.

static PySide.QtXml.QDomImplementation.setInvalidDataPolicy(policy)
Parameters:policy – PySide.QtXml.QDomImplementation.InvalidDataPolicy

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

The 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")

See also

PySide.QtXml.QDomImplementation.invalidDataPolicy() QDomImplementation.InvalidDataPolicy

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