If you really do have a parameter with an arity of ?, then it won’t be
function mapping. Function mapping only happens when a function parameter is
specified to allow one-and-only-one. In that case it’s unambiguous to map each
item in a sequence onto a function call. If a parameter is optional, then it
isn’t.
If you’re calling a function with more than one parameter, you could see
function mapping on any of them. If any parameter is a singleton, function
mapping can happen. A common trap is to pass a variable, which might be an
empty sequence to a singleton parameter, which results in zero calls to the
function.
Or it could be namespaces.
---
Ron Hitchens {[email protected]} +44 7879 358212
> On Aug 21, 2015, at 5:56 PM, Hasegawa, Margarete
> <[email protected]> wrote:
>
> Yes, I think function mapping is the most likely problem. Thanks for the link
> documentation link.
>
> Maggie
>
> From: Justin Makeig <[email protected]
> <mailto:[email protected]>>
> Reply-To: MarkLogic Developer Discussion <[email protected]
> <mailto:[email protected]>>
> Date: Friday, August 21, 2015 12:54 PM
> To: MarkLogic Developer Discussion <[email protected]
> <mailto:[email protected]>>
> Subject: Re: [MarkLogic Dev General] Failure to enforce occurrence indicators
> in function signature
>
> You're likely running into function mapping
> <http://docs.marklogic.com/guide/xquery/enhanced#id_55459
> <http://docs.marklogic.com/guide/xquery/enhanced#id_55459>>.
>
> Justin
>
>
>> On Aug 21, 2015, at 9:44 AM, Hasegawa, Margarete
>> <[email protected] <mailto:[email protected]>> wrote:
>>
>> Hi,
>>
>> Has anyone experienced an issue with MarkLogic failing to enforce occurrence
>> indicators in function calls? For example, a function expects xs:string?
>> (meaning that the function is expecting either the empty sequence or a
>> single node), but instead accepts multiple values and does not fail. We've
>> observed that instead of raising a syntax error, ML will sometimes give
>> unpredictable behavior instead. Could this be a bug?
>>
>> Many thanks!
>> Maggie
>>
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