QXmlSchemaValidator

The QXmlSchemaValidator class validates XML instance documents against a W3C XML Schema. More

Inheritance diagram of PySide2.QtXmlPatterns.QXmlSchemaValidator

New in version 4.6.

Synopsis

Functions

Detailed Description

The QXmlSchemaValidator class loads, parses an XML instance document and validates it against a W3C XML Schema that has been compiled with QXmlSchema .

The following example shows how to load a XML Schema from a local file, check whether it is a valid schema document and use it for validation of an XML instance document:

schemaUrl = QUrl("file:///home/user/schema.xsd")

schema = QXmlSchema()
schema.load(schemaUrl)

if schema.isValid():
    file = QFile("test.xml")
    file.open(QIODevice.ReadOnly)

    validator = QXmlSchemaValidator(schema)
    if validator.validate(file, QUrl.fromLocalFile(file.fileName())):
        print "instance document is valid"
    else:
        print "instance document is invalid"
}

XML Schema Version

This class implements schema validation according to the XML Schema 1.0 specification.

class QXmlSchemaValidator

QXmlSchemaValidator(schema)

param schema

QXmlSchema

Constructs a schema validator. The schema used for validation must be referenced in the XML instance document via the xsi:schemaLocation or xsi:noNamespaceSchemaLocation attribute.

PySide2.QtXmlPatterns.QXmlSchemaValidator.messageHandler()
Return type

QAbstractMessageHandler

Returns the message handler that handles parsing and validation messages for this QXmlSchemaValidator .

PySide2.QtXmlPatterns.QXmlSchemaValidator.namePool()
Return type

QXmlNamePool

Returns the name pool used by this QXmlSchemaValidator for constructing names . There is no setter for the name pool, because mixing name pools causes errors due to name confusion.

PySide2.QtXmlPatterns.QXmlSchemaValidator.networkAccessManager()
Return type

QNetworkAccessManager

Returns the network manager, or 0 if it has not been set.

PySide2.QtXmlPatterns.QXmlSchemaValidator.schema()
Return type

QXmlSchema*

Returns the schema that is used for validation.

See also

setSchema()

PySide2.QtXmlPatterns.QXmlSchemaValidator.setMessageHandler(handler)
Parameters

handlerQAbstractMessageHandler

Changes the message handler for this QXmlSchemaValidator to handler . The schema validator sends all parsing and validation messages to this message handler. QXmlSchemaValidator does not take ownership of handler .

Normally, the default message handler is sufficient. It writes compile and validation messages to stderr . The default message handler includes color codes if stderr can render colors.

When QXmlSchemaValidator calls message() , the arguments are as follows:

message() argument

Semantics

QtMsgType type

Only QtWarningMsg and QtFatalMsg are used. The former identifies a warning, while the latter identifies an error.

const QString & description

An XHTML document which is the actual message. It is translated into the current language.

const QUrl &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 & sourceLocation

Identifies where the error occurred.

See also

messageHandler()

PySide2.QtXmlPatterns.QXmlSchemaValidator.setNetworkAccessManager(networkmanager)
Parameters

networkmanagerQNetworkAccessManager

Sets the network manager to manager . QXmlSchemaValidator does not take ownership of manager .

PySide2.QtXmlPatterns.QXmlSchemaValidator.setSchema(schema)
Parameters

schemaQXmlSchema

Sets the schema that shall be used for further validation. If the schema is empty, the schema used for validation must be referenced in the XML instance document via the xsi:schemaLocation or xsi:noNamespaceSchemaLocation attribute.

See also

schema()

PySide2.QtXmlPatterns.QXmlSchemaValidator.setUriResolver(resolver)
Parameters

resolverQAbstractUriResolver

Sets the URI resolver to resolver . QXmlSchemaValidator does not take ownership of resolver .

See also

uriResolver()

PySide2.QtXmlPatterns.QXmlSchemaValidator.uriResolver()
Return type

QAbstractUriResolver

Returns the schema’s URI resolver. If no URI resolver has been set, Qt XML Patterns will use the URIs in instance documents as they are.

The URI resolver provides a level of abstraction, or polymorphic URIs . A resolver can rewrite logical URIs to physical ones, or it can translate obsolete or invalid URIs to valid ones.

When Qt XML Patterns calls resolve() the absolute URI is the URI mandated by the schema specification, and the relative URI is the URI specified by the user.

See also

setUriResolver()

PySide2.QtXmlPatterns.QXmlSchemaValidator.validate(source[, documentUri=QUrl()])
Parameters
  • sourceQIODevice

  • documentUriQUrl

Return type

bool

PySide2.QtXmlPatterns.QXmlSchemaValidator.validate(data[, documentUri=QUrl()])
Parameters
  • dataQByteArray

  • documentUriQUrl

Return type

bool

PySide2.QtXmlPatterns.QXmlSchemaValidator.validate(source)
Parameters

sourceQUrl

Return type

bool

Validates the XML instance document read from source against the schema.

Returns true if the XML instance document is valid according to the schema, false otherwise.

Example:

schema = getSchema()

url = QUrl("http://www.schema-example.org/test.xml")

validator = QXmlSchemaValidator(schema)
if validator.validate(url):
    print "instance document is valid"
else:
    print "instance document is invalid"