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[Bug 1475] New: [FO] fn:subsequence: Should allow empty for startingLoc and length

From: <bugzilla@wiggum.w3.org>
Date: Thu, 19 May 2005 20:11:10 +0000
To: public-qt-comments@w3.org
Cc:
Message-Id: <E1DYrMM-0003DB-Mz@wiggum.w3.org>

http://www.w3.org/Bugs/Public/show_bug.cgi?id=1475

           Summary: [FO] fn:subsequence: Should allow empty for startingLoc
                    and length
           Product: XPath / XQuery / XSLT
           Version: Last Call drafts
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Functions and Operators
        AssignedTo: ashok.malhotra@oracle.com
        ReportedBy: mrys@microsoft.com
         QAContact: public-qt-comments@w3.org
 BugsThisDependsOn: 1467


startingLoc and length should be allowed to be empty. Often these values are 
being calculated and the static type of the calculation will result in an 
optionally empty type. Proposed rewording:

fn:subsequence($sourceSeq as item()*, $startingLoc as xs:double?) as item()*
fn:subsequence( $sourceSeq  as item()*, 
$startingLoc  as xs:double?, 
$length  as xs:double?) as item()* 

Summary: Returns the contiguous sequence of items in the value of $sourceSeq 
beginning at the position indicated by the value of $startingLoc and 
continuing for the number of items indicated by the value of $length. 

If $startingLoc is the empty sequence, the error FORG--99 is raised.
If $length is the empty sequence, the result is the empty sequence.

More specifically, returns the items in $sourceString whose position $p obeys:

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Received on Thursday, 19 May 2005 20:11:16 UTC

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