30297 2018-10-15 08:25:37 +0000 Compatibility of overridden functions 2019-02-20 00:33:35 +0000 1 1 1 Unclassified XPath / XQuery / XSLT XSLT 3.0 Recommendation PC All RESOLVED FIXED P2 normal --- 1 mike mike abel.online public-qt-comments oldest_to_newest 129349 0 mike 2018-10-15 08:25:37 +0000 In discussing compatibility of overriding functions, §3.5.3.3 says If the overridden function specifies streamable="yes" then the overriding function also specifies streamable="yes", and in addition, it has the same posture and sweep as the function that it overrides. What it means to say is: The explicit or implicit value of the streamability attribute in the overriding function must be the same as the explicit or implicit value of the streamability attribute in the overridden function. 129358 1 abel.online 2018-10-24 13:41:01 +0000 I actually think this was deliberate, I remember (but cannot readily find the reference) that we discussed that a non-streamable stylesheet function can be overridden by a streamable stylesheet function, but not the other way around. Hence the current rule is written specifically to refer only to the situation where streamable="yes" is specified. Your change would suggest that that is no longer the case and would make this change more than just editorial. 129359 2 mike 2018-10-24 13:47:02 +0000 OK, but my main point was that xsl:function does not have an @streamable attribute, it has an @streamability attribute. Also, a function per se does not have a posture and sweep. Perhaps the correct text is: If the overridden function has a streamability attribute with a value other than "unspecified", then the overriding function must have a streamability attribute with the same value. 129361 3 abel.online 2018-10-24 16:30:33 +0000 I didn't realize that, yes that makes sense. 129538 4 mike 2019-02-20 00:33:35 +0000 Covered by draft erratum E32, see https://htmlpreview.github.io/?https://github.com/w3c/qtspecs/blob/master/errata/xslt-30/html/xslt-30-errata.html#E32