exFuncs.add(new SystemProperty(this));
exFuncs.add(new StepAvailable(this));
exFuncs.add(new IterationSize(this));
exFuncs.add(new IterationPosition(this));
exFuncs.add(new ValueAvailable(this));
exFuncs.add(new VersionAvailable(this));
exFuncs.add(new XPathVersionAvailable(this));
for (XProcExtensionFunctionDefinition xf : exFuncs) {
processor.registerExtensionFunction(xf);
}