A RESTful browser for eXist Java-Based Function Modules

http://www.w3.org/2005/xpath-functions
A module with the XQuery/XPath Core Library Functions
number
number($arg as xdt:anyAtomicType?) xs:double
Returns the value indicated by $arg or, if $arg is not specified, the context item after atomization, converted to an xs:double.
Calling the zero-argument version of the function is defined to give the same result as calling the single-argument version with the context item (.). That is, fn:number() is equivalent to fn:number(.).
If $arg is the empty sequence or if $arg or the context item cannot be converted to an xs:double, the xs:double value NaN is returned. If the context item is undefined an error is raised: [err:XPDY0002]XP.
If $arg is the empty sequence, NaN is returned. Otherwise, $arg, or the context item after atomization, is converted to an xs:double following the rules of 17.1.3.2 Casting to xs:double. If the conversion to xs:double fails, the xs:double value NaN is returned.
$argThe input item
Returns the numerical value
number
number() xs:double
Returns the value of the context item after atomization, converted to an xs:double.
If the context item cannot be converted to an xs:double, the xs:double value NaN is returned. If the context item is undefined an error is raised: [err:XPDY0002]XP.
Returns the numerical value
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