Bug 4448 – [FO] Return type of op:subtract-dateTimes, op:subtract-dates, op:subtract-times

Bug 4448 - [FO] Return type of op:subtract-dateTimes, op:subtract-dates, op:subtract-times

Summary:

[FO] Return type of op:subtract-dateTimes, op:subtract-dates, op:subtract-times

Status:	CLOSED FIXED

Product:	XPath / XQuery / XSLT
Component:	Functions and Operators 1.0
Version:	Recommendation
Platform:	PC Windows NT

Importance:	P2 normal
Target Milestone:	---
Assigned To:	Michael Kay
QA Contact:	Mailing list for public feedback on specs from XSL and XML Query WGs

URL:
Whiteboard:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2007-04-03 10:24 UTC by Tim Mills
Modified:	2007-11-16 09:12 UTC (History)
CC List:	1 user (show)

See Also:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.

Description Tim Mills 2007-04-03 10:24:24 UTC

The signatures of:

op:subtract-dateTimes
op:subtract-dates
op:subtract-times

all have xs:dayTimeDuration? return type.  Unless I'm mistaken, these functions
can never return the empty sequence and should therefore have return type
xs:dayTimeDuration,

Comment 1 Michael Kay 2007-04-04 12:23:06 UTC

I think you are correct.

Of course, these functions are only an internal formalism so there is no direct
effect on users.

Comment 2 Michael Kay 2007-04-16 21:25:14 UTC

The WGs agreed today to make the change of removing the "?" from the result
type signature of these functions. I am therefore closing the bug report.

Michael Kay
for the XSL and XQuery WGs

Comment 3 Michael Kay 2007-05-01 22:15:38 UTC

For the record, op:subtract-times appears to have the correct signature
already; the other two are wrong.

Michael Kay

Comment 4 Michael Kay 2007-08-09 15:34:03 UTC

*** Bug 4927 has been marked as a duplicate of this bug. ***

Comment 5 Michael Kay 2007-11-16 09:12:56 UTC

This will appear as erratum FO.E5