{
configuration.registerExtensionFunction(new LineNumberFunction());
}
if (!xpathContext.getFunctionLibrary().isAvailable(ColumnNumberFunction.QNAME, -1))
{
configuration.registerExtensionFunction(new ColumnNumberFunction());
}
if (!xpathContext.getFunctionLibrary().isAvailable(SystemIdFunction.QNAME, -1))
{
configuration.registerExtensionFunction(new SystemIdFunction());
}