XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition (462 page)

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Authors: Michael Kay

BOOK: XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition
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E
must be a capital
E
. Apart from these constraints, the system can choose any string that preserves the original value when converted back to a double.
If you want a more user-friendly representation of the number, XSLT allows you to control the formatting using the
format-number()
function. Outside the XSLT environment, you can trim unwanted digits using the function
round-half-to-even()
, which is described in Chapter 13.
untypedAtomic
Returns the same result as converting to a string, but the result is labeled as
untypedAtomic
.

Converting from duration

Destination Type
Rules
duration
The value is returned unchanged.
string
The duration is output in a normalized form in which the number of months will be less than 12, the number of hours less than 24, the number of minutes and seconds less than 60. Zero-valued components are omitted. A zero-length duration is output as
PT0S
, unless it is an instance of
xs:yearMonthDuration
, in which case it is output as
P0 M
.
untypedAtomic
Returns the same result as converting to a string, but the result is labeled as
untypedAtomic
.

Converting from float

Destination Type
Rules
boolean
The values positive zero, negative zero, and
NaN
are converted to
false
, and any other value is converted to
true
.
decimal
The result is the decimal value, within the range of decimal values that the implementation can handle, whose value is numerically closest to the value of the supplied float; if two values are equally close, the value is rounded toward zero. Overflow is handled in the same way as for double-to-decimal conversion: See page 660.
double
The value space for
float
is a strict subset of that for
double
, so it is possible to convert every float value to a double without loss. The specification achieves this by stating that the conversion returns the
double
that has the same exponent and mantissa as the supplied
float
, with zero, NaN and infinity being treated specially.
float
The value is returned unchanged.
string
The rules are the same as those for double-to-string conversion: see page 660.
untypedAtomic
Returns the same result as converting to a string, but the result is labeled as
untypedAtomic
.

Converting from gDay

Destination Type
Rules
gDay
The value is returned unchanged.
string
The output will be in the form
---DD
, followed by a timezone if the value includes one, formatted as for
xs:date
.
untypedAtomic
Returns the same result as converting to a string, but the result is labeled as
untypedAtomic
.

Converting from gMonth

Destination Type
Rules
gMonth
The value is returned unchanged.
string
The output will be in the form
--MM
, followed by a timezone if the value includes one, formatted as for
xs:date
. (There was an error in the XML Schema Recommendation, corrected in later editions, which gave the format as
--MM--
).
untypedAtomic
Returns the same result as converting to a string, but the result is labeled as
untypedAtomic
.

Converting from gMonthDay

Destination Type
Rules
gMonthDay
The value is returned unchanged.
String
The output will be in the form
--MM-DD
, followed by a timezone if the value includes one, formatted as for
xs:date
.
untypedAtomic
Returns the same result as converting to a string, but the result is labeled as
untypedAtomic
.

Converting from gYear

Destination Type
Rules
gYear
The value is returned unchanged.
string
The output will be in the form
YYYY
, followed by a timezone if the value includes one, formatted as for
xs:date
. Negative years are preceded by
-
.
untypedAtomic
Returns the same result as converting to a string, but the result is labeled as
untypedAtomic
.

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