How transformations can work with xslt

need to apply the transformations to the XY coordinates

looked at some kml and converted svg samples, done by other people.
the coordinates are not the same. and they did transformation for them.
The transformations need to be understood.

need Math on XSLT.

is math in xslt doable? If so, how can it be added?
if using Python, what part of the conversion work can be done by Python?
If you decide to use python, you will use lxml to read KML and write SVG, abstracting the XML notation. The math will be simple python expressions.

Math on XSLT

 http://www.java2s.com/Tutorial/XML/0100__XSLT-stylesheet/Mathcalculation.htm

XSLT may suppot more math and more complex transformations