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Bug 23355 - Predicate with position() in incrementally consuming expressions is not allowed
Summary: Predicate with position() in incrementally consuming expressions is not allowed
Status: CLOSED FIXED
Alias: None
Product: XPath / XQuery / XSLT
Classification: Unclassified
Component: XSLT 3.0 (show other bugs)
Version: Working drafts
Hardware: PC Windows NT
: P2 normal
Target Milestone: ---
Assignee: Michael Kay
QA Contact: Mailing list for public feedback on specs from XSL and XML Query WGs
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Reported: 2013-09-25 15:58 UTC by Abel Braaksma
Modified: 2014-05-15 14:00 UTC (History)
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Description Abel Braaksma 2013-09-25 15:58:12 UTC 
The following expression is currently not streamable:

<xsl:for-each select="A/B[position() <= 10]">
    ...
</xsl:for-each>

the reason for it being not streamable is that position is focus dependent and focus dependent functions make the whole expression free ranging. It seems reasonable to relax that rule for position().
Comment 1 Michael Kay 2013-10-24 08:55:06 UTC 
I believe this is fixed in the latest draft. The position() function is now grounded and motionless: see section 19.8.8.9.