fn:number
number() ➔ xs:double
Equivalent to number(.); converts the value of the context item to a
              double.
There are no arguments  | |||
Result  | xs:double  | ||
number($arg as xs:anyAtomicType?) ➔ xs:double
Converts the supplied value to a double, or returns NaN if conversion is not possible.
Arguments  | |||
  | $arg  | xs:anyAtomicType?  | |
Result  | xs:double  | ||
Namespace
http://www.w3.org/2005/xpath-functions
Links to W3C specifications
XPath 2.0 Functions and Operators