CopperSpice API  1.7.2
QXmlSchema Class Reference

The QXmlSchema class provides loading and validation of a W3C XML Schema. More...

Public Methods

 QXmlSchema ()
 
 QXmlSchema (const QXmlSchema &other)
 
 ~QXmlSchema ()
 
QUrl documentUri () const
 
bool isValid () const
 
bool load (const QByteArray &data, const QUrl &documentUri=QUrl ())
 
bool load (const QUrl &source)
 
bool load (QIODevice *source, const QUrl &documentUri=QUrl ())
 
QAbstractMessageHandlermessageHandler () const
 
QXmlNamePool namePool () const
 
QNetworkAccessManagernetworkAccessManager () const
 
void setMessageHandler (QAbstractMessageHandler *handler)
 
void setNetworkAccessManager (QNetworkAccessManager *manager)
 
void setUriResolver (const QAbstractUriResolver *resolver)
 
const QAbstractUriResolveruriResolver () const
 

Detailed Description

The QXmlSchema class provides loading and validation of a W3C XML Schema.

The QXmlSchema class loads, compiles and validates W3C XML Schema files that can be used further for validation of XML instance documents via QXmlSchemaValidator.

The following example shows how to load a XML Schema file from the network and test whether it is a valid schema document:

QUrl 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

This class is used to represent schemas that conform to the XML Schema 1.0 specification.

See also
QXmlSchemaValidator

Constructor & Destructor Documentation

QXmlSchema::QXmlSchema ( )

Constructs an invalid, empty schema that can not be used until load() is called.

QXmlSchema::QXmlSchema ( const QXmlSchema &  other)

Constructs a QXmlSchema that is a copy of other. The new instance will share resources with the existing schema to the extent possible.

QXmlSchema::~QXmlSchema ( )

Destroys this QXmlSchema.

Method Documentation

QUrl QXmlSchema::documentUri ( ) const

Returns the document URI of the schema or an empty URI if no schema has been set.

bool QXmlSchema::isValid ( ) const

Returns true if this schema is valid. Examples of invalid schemas are ones that contain syntax errors or that do not conform the W3C XML Schema specification.

bool QXmlSchema::load ( const QByteArray data,
const QUrl documentUri = QUrl() 
)

Sets this QXmlSchema to a schema read from the data

documentUri represents the schema obtained from the data. It is the base URI of the schema, that is used internally to resolve relative URIs that appear in the schema, and for message reporting.

If documentUri is not a valid URI, behavior is undefined.

If the schema is invalid, false is returned and the behavior is undefined.

Example:

QByteArray data( "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
"<xsd:schema"
" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""
" xmlns=\"http://copperspice.com/xmlschematest\""
" targetNamespace=\"http://copperspice.com/xmlschematest\""
" version=\"1.0\""
" elementFormDefault=\"qualified\">"
"</xsd:schema>" );
QXmlSchema schema;
schema.load(data);
if (schema.isValid()) {
qDebug() << "schema is valid";
} else {
qDebug() << "schema is invalid";
}
See also
isValid(), isValid()
bool QXmlSchema::load ( const QUrl source)

Sets this QXmlSchema to a schema loaded from the source URI.

If the schema is invalid, false is returned and the behavior is undefined.

Example:

QUrl url("http://www.schema-example.org/myschema.xsd");
QXmlSchema schema;
if (schema.load(url) == true)
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
See also
isValid()
bool QXmlSchema::load ( QIODevice source,
const QUrl documentUri = QUrl() 
)

Sets this QXmlSchema to a schema read from the source device. The device must have been opened with at least QIODevice::ReadOnly.

documentUri represents the schema obtained from the source device. It is the base URI of the schema, that is used internally to resolve relative URIs that appear in the schema, and for message reporting.

If source is null or not readable, or if documentUri is not a valid URI, behavior is undefined.

If the schema is invalid, false is returned and the behavior is undefined.

Example:

QFile file("myschema.xsd");
file.open(QIODevice::ReadOnly);
QXmlSchema schema;
schema.load(&file, QUrl::fromLocalFile(file.fileName()));
if (schema.isValid())
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
See also
isValid()
QAbstractMessageHandler * QXmlSchema::messageHandler ( ) const

Returns the message handler that handles compile and validation messages for this QXmlSchema.

See also
setMessageHandler()
QXmlNamePool QXmlSchema::namePool ( ) const

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

QNetworkAccessManager * QXmlSchema::networkAccessManager ( ) const

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

See also
setNetworkAccessManager()
void QXmlSchema::setMessageHandler ( QAbstractMessageHandler handler)

Changes the message handler for this QXmlSchema to handler. The schema sends all compile and validation messages to this message handler. QXmlSchema 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 QXmlSchema calls QAbstractMessageHandler::message(), the arguments are as follows:

message() argumentSemantics
<QtMsgType typeOnly QtWarningMsg> and QtFatalMsg are used. The former identifies a warning, while the latter identifies an error.
const QString & descriptionAn XHTML document which is the actual message. It is translated into the current language.
const QUrl &identifierIdentifies the error with a URI, where the fragment is the error code, and the rest of the URI is the error namespace.
const QSourceLocation & sourceLocationIdentifies where the error occurred.
See also
messageHandler()
void QXmlSchema::setNetworkAccessManager ( QNetworkAccessManager manager)

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

See also
networkAccessManager()
void QXmlSchema::setUriResolver ( const QAbstractUriResolver resolver)

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

See also
uriResolver()
const QAbstractUriResolver * QXmlSchema::uriResolver ( ) const

Returns the schema's URI resolver. If no URI resolver has been set, CsXmlPatterns will use the URIs in schemas 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 CsXmlPatterns calls QAbstractUriResolver::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()