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[Bug 3183] [FS] editorial: 4.1.5 Function Calls: []_FunctionArgument

From: <bugzilla@wiggum.w3.org>
Date: Wed, 03 May 2006 18:41:21 +0000
CC:
To: public-qt-comments@w3.org
Message-Id: <E1FbMHp-0001h3-9E@wiggum.w3.org>

http://www.w3.org/Bugs/Public/show_bug.cgi?id=3183

           Summary: [FS] editorial: 4.1.5 Function Calls:
                    []_FunctionArgument
           Product: XPath / XQuery / XSLT
           Version: Candidate Recommendation
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: Formal Semantics
        AssignedTo: simeon@us.ibm.com
        ReportedBy: jmdyck@ibiblio.org
         QAContact: public-qt-comments@w3.org


4.1.5 Function Calls

Notation
[]_FunctionArgument
    First, picking up on Bug 1576 comment #2, note that the conditional
    structures of []_AtomizeAtomic and []_Convert are now identical,
    so the two can be merged (into []_ConvertAtomic, say):

        [ Expr ]_ConvertAtomic(SequenceType) denotes
        fs:convert-simple-operand(fn:data(Expr),PrototypicalValue)
            If [SequenceType]_sequencetype <: xdt:anyAtomicType*
        Expr
            Otherwise

    Second, note that, as seen at the end of Bug 1680 comment #4,
    []_FunctionArgument() is actually invoked with a Type, not a
    SequenceType (because when you look up the function name/arity in
    statEnv.funcType, you get a signature with Types, not SequenceTypes).
    This modifies the above definition to:

        [ Expr ]_ConvertAtomic(Type) denotes
        fs:convert-simple-operand(fn:data(Expr),PrototypicalValue)
            If Type <: xdt:anyAtomicType*
        Expr
            Otherwise

    Finally, I suggest that rather than using this ad hoc If/Otherwise
    notation, the whole []_FunctionArgument() mapping would be better
    expressed as two inference rules:

        statEnv |- Type <: xdt:anyAtomicType*
        -------------------------------------
        statEnv |- [ Expr ]_FunctionArgument(Type) =
            fs:convert-simple-operand(fn:data( [Expr]_Expr ),ProtoValue)

        statEnv |- not( Type <: xdt:anyAtomicType* )
        --------------------------------------------
        statEnv |- [ Expr ]_FunctionArgument(Type) = [Expr]_Expr
Received on Wednesday, 3 May 2006 18:42:47 UTC

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