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[Bug 1745] New: [FS] editorial: 7.1.3 The fs:convert-operand function

From: <bugzilla@wiggum.w3.org>
Date: Tue, 19 Jul 2005 04:06:22 +0000
To: public-qt-comments@w3.org
Message-Id: <E1DujN8-0000Nb-RK@wiggum.w3.org>


           Summary: [FS] editorial: 7.1.3 The fs:convert-operand function
           Product: XPath / XQuery / XSLT
           Version: Last Call drafts
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Formal Semantics
        AssignedTo: simeon@us.ibm.com
        ReportedBy: jmdyck@ibiblio.org
         QAContact: public-qt-comments@w3.org

7.1.3 The fs:convert-operand function

"$actual as item?"
    In every use of fs:convert-operand in the FS, the first argument is
    the result of a call to fn:data, which means it must be of type
    "xdt:anyAtomicType*". So "item?" could be narrowed to

"is of type"
    Change to "is an instance of"? (That's the terminology that XQuery

"a. if $expected is of type xdt:untypedAtomic, returns $actual cast to
    After "xdt:untypedAtomic", insert "or xs:string" (with corresponding
    changes to STA / rules 2 and 4), otherwise I think there is a
    discrepancy between semantics of fs:convert-operand and the semantics
    described in XQuery 3.5.2 for General Comparisons.
    Specifically, if $actual is an instance of xdt:untypedAtomic, and
    $expected is an instance of a subtype of xs:string, fs:convert-operand
    will (currently) follow 2c and cast $actual to the type of $expected
    (the subtype of xs:string), whereas 3.5.2 says that it should be cast
    to xs:string. With the suggested change, fs:convert-operand will
    follow 2a and cast $actual to xs:string.

    (Yes, I'm doubtful that this is an important distinction, but it's a
    simple change, and it makes it easier to see that fs:convert-operand
    agrees with the XQuery doc, so why not do it?)

"Otherwise, the operand is returned unchanged"
    Change to "Otherwise, returns $actual".

"No conversion is needed for numeric (or empty) operands."
    Actually, no conversion is necessary unless $actual is an instance of

STA / rule 1 / premise 2
"statEnv |- Type1 <: (xs:decimal|xs:float|xs:double)?"
    Change to
        statEnv |- not( Type1 <: xdt:untypedAtomic? )

STA / rule (2|3) / premise 1
"statEnv |- Expr1 <: Type1"
    Change "<:" to ":".
Received on Tuesday, 19 July 2005 04:06:27 UTC

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