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#include <QtCore>

#include <QtXmlPatterns>

class SchemaValidator

{

    public:

        void validateFromUrl() const;

        void validateFromFile() const;

        void validateFromData() const;

        void validateComplete() const;

    private:

        QXmlSchema getSchema() const;

};

void SchemaValidator::validateFromUrl() const

{

//! [0]

    const QXmlSchema schema = getSchema();

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

    QXmlSchemaValidator validator(schema);

    if (validator.validate(url))

        qDebug() << "instance document is valid";

    else

        qDebug() << "instance document is invalid";

//! [0]

}

void SchemaValidator::validateFromFile() const

{

//! [1]

    const QXmlSchema schema = getSchema();

    QFile file("test.xml");

    file.open(QIODevice::ReadOnly);

    QXmlSchemaValidator validator(schema);

    if (validator.validate(&file, QUrl::fromLocalFile(file.fileName())))

        qDebug() << "instance document is valid";

    else

        qDebug() << "instance document is invalid";

//! [1]

}

void SchemaValidator::validateFromData() const

{

//! [2]

    const QXmlSchema schema = getSchema();

    QByteArray data("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"

                    "<test></test>");

    QBuffer buffer(&data);

    buffer.open(QIODevice::ReadOnly);

    QXmlSchemaValidator validator(schema);

    if (validator.validate(&buffer))

        qDebug() << "instance document is valid";

    else

        qDebug() << "instance document is invalid";

//! [2]

}

QXmlSchema SchemaValidator::getSchema() const

{

    QByteArray data("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"

                    "<xsd:schema"

                    "        xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""

                    "        xmlns=\"http://qt.nokia.com/xmlschematest\""

                    "        targetNamespace=\"http://qt.nokia.com/xmlschematest\""

                    "        version=\"1.0\""

                    "        elementFormDefault=\"qualified\">"

                    "</xsd:schema>");

    QBuffer buffer(&data);

    buffer.open(QIODevice::ReadOnly);

    QXmlSchema schema;

    schema.load(&buffer);

    return schema;

}

void SchemaValidator::validateComplete() const

{

//! [3]

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

    QXmlSchema schema;

    schema.load(schemaUrl);

    if (schema.isValid()) {

        QFile file("test.xml");

        file.open(QIODevice::ReadOnly);

        QXmlSchemaValidator validator(schema);

        if (validator.validate(&file, QUrl::fromLocalFile(file.fileName())))

            qDebug() << "instance document is valid";

        else

            qDebug() << "instance document is invalid";

    }

//! [3]

}

int main(int argc, char **argv)

{

    QCoreApplication app(argc, argv);

    SchemaValidator validator;

    validator.validateFromUrl();

    validator.validateFromFile();

    validator.validateFromData();

    validator.validateComplete();

    return 0;

}