
1. Create an XPath expression which validates that every cost has two digits to the
   right of the decimal point. Change one of the cost value (add another digit onto
   the end) and execute your XPath expression again.

   for $i in //cost return if (matches($i, '^\d+\.\d\d$')) then 'Ok ' else 'Error! '


2. Is the second juicer's name 'CHAMPION JUICER'? Create an XPath expression to answer this
   question. Do a case-insensitive comparison.

   matches(//juicer[2]/name, 'CHAMPION JUICER', 'i')