2794 2006-02-02 14:58:47 +0000 [Update] mixing pending update lists with values 2018-09-29 12:50:29 +0000 1 1 1 Unclassified XPath / XQuery / XSLT Update Facility Working drafts Macintosh All CLOSED LATER P2 normal --- 1 dflorescu andrew.eisenberg jim.melton joker88john martin public-qt-comments oldest_to_newest 8104 0 dflorescu 2006-02-02 14:58:48 +0000 The XQuery Update Working Draft from 1/27/06 allows expressions (e.g. the expressions created by the "," operator) to return both a pending update list and a value (i.e. a normal XDM instance). The pros and cons and the consequences of such a decision are still under discussion. 11030 1 martin 2006-08-06 08:59:36 +0000 Is there any way to weigh in on this issue? If I'm not misreading it, the current spec as of 2006-07-11 disallows expressions to return both values and pending update lists (by disallowing expressions that have updating and non-updating children). I'm not entirely sure about that, as the wording is pretty strange: 1. If any branch contains an updating expression, the conditional expression is an updating expression; otherwise it is a non-updating expression. ... 3.If the conditional expression is an updating expression, then both of its branches must contain either an updating expression, an empty expression ( ), or a call to the fn:error function; otherwise a static error is raised [err:XUST0001]. In this case, the test expression is evaluated and the then or else clause is selected and evaluated as specified in Section 3.10 of [XQuery 1.0]. The result of the conditional expression is the pending update list returned by the selected branch. This seems like a very complicated way of saying "If one of the branches of a conditional expression is an updating expression, the other has to be one too". I think Mary Holsteges comment in bug #2796 is very valid, disallowing this will forbid so many use cases that it renders the whole thing entirely useless. 11268 2 jim.melton 2006-08-24 22:30:22 +0000 This will not be included in version 1.0 of the XQuery Update Facility. It may be reconsidered for some future version of the Update Facility.