Compile problem when using QXmlSchema with Ubuntu 11.04

Hi,

Not sure if this is a newbie question or not, but I can't get the example code from

http://qt.developpez.com/doc/4.7/qxmlschema/

to work. My minimum test case is

//

Code:

---

#include <QXmlSchema>
 
QUrl schemaUrl("file:///home/mark/adversity/stylesheets/ttl_stylesheets.xsd");
 
QXmlSchema schema;
schema.load(schemaUrl);

---

//

My .pro file is

//

Code:

---

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
 
QT += xmlpatterns
 
# Input
SOURCES += main.cpp

---

//

When I try to compile this with Ubuntu 11.04 (which appears to be QT 4.7.2) I get

##

Code:

---

$ make
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_XMLPATTERNS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4 -I. -I. -o main.o main.cpp
main.cpp:6:1: error: ‘schema’ does not name a type
make: *** [main.o] Erreur 1

---

##

The thing I really don't understand is why, if there's a compiling problem, it isn't flagged on line 5, ie

Code:

---

QXmlSchema schema;

---

If that line compiles correctly, I can't see why 'schema' in

Code:

---

schema.load(schemaUrl);

---

does not name a type.

I've compiled several other fairly substantial QT programs in this environment, including one using SAX, so the problem appears to be quite specific.

All suggestions gratefully received...

(Obviously my code is missing a main(), but the compiler isn't getting far enough for that to be an issue...)

---

Added after 13 minutes:

(Although, obviously, not wrapping the code within a function definition changes the context, and if I do that it does compile. Oh well...)