generateSLD bug

[Stefanie Weykam]

I don't know if this bug has been filed before:

generateSLD():

Some class expressions are not properly understood and create erroneous
filters in XML documents. It seems that not all logical operators are
recognised:


This expression      fieldname >20 AND fieldname <=40

results in   .. PropertyIsGreaterThan ... Literal 20
instead of IsBetween

and with this expression      fieldname  <=40
 the Proterty line is completely missing 


I have just upgraded from MapServer/MapScript4.4 to 4.6.1 and it is still
the same.