xs:double

Construct a double value from an item value.

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Related Syntax Constructs

The following construct(s) refer to this construct:

[  Syntax   |  Description   |  Argument   |  Example  ]

Syntax

xs:double(item $value) => double

Description

This is a constructor function that takes an item value as argument and returns a value of type xs:double. If the argument is a literal, then the literal must be a valid lexical form of its type.

As specified in the respective section of the W3C recommendation XML Schema Part 2: Datatypes, a value of type xs:double represents a double-precision floating point number according to IEEE 754-1985. The lexical form uses scientific notation, consisting of the mantissa which must be a decimal number, the letter "E" or "e", and an exponent which must be an integer value.

Argument

$value

item value

Example

  • Generate a valid value of type xs:double: 

    xs:double("002002.270")

    This number is represented as 2.00227E3.