Nothing appears when I apply an XSLT stylesheet to an XML file

I'm working on a simple educational project for learning the XSLT language, but when I try to apply the style sheet to the XML file the transformation returns me a blank HTML page, what you think is the error in the code linked later? (using XMLSpear as editor)

here is the xml code http://ift.tt/1BWaaW1

here is the xls code http://ift.tt/1BWaaW6