[rus-wg] RUS Specification - operation results

[John Ainsworth]

I think the use case Sven presents is valid, but I don't like the idea 
of having so many parallel operations in the interface though. I think 
the operation Steven describes is all that would be needed.

John

On 7 Apr 2005, at 17:09, Sven van den Berghe wrote:

> Steven,
>
>  I can see some cases where the purpose of a query is only to get one 
> (or
> more) RUSIds for further processing (e.g. updates) so returning a full
> record is excessive.
>
> Sven
>
>
> "Steven Newhouse" <sjn5 at doc.ic.ac.uk> wrote:
>
>>> The extract/fetch operations seem to return one or more full
>>> RUSUsageRecords, would it be sensible to add parallel operations 
>>> that return
>>> just the ids?
>>
>> I think you identify a need for just a single additional operation.
>>
>> RUS::extractRecordsRUSId
>> INPUT: XPath/XQuery
>> OUTPUT: List of RUSIds
>>
>> The existing operation RUS::extractSpecificRecords could then be used 
>> to
>> extract the relevant records.
>>
>> Following the initial extraction of the RUS Ids what would the client 
>> do
>> with them? As there is no meta-data other than the ID one of the few
>> things would seem to iterate over them to retrieve specific records 
>> in turn.
>>
>> The list of RUSIds from one search operation could be compared to that
>> of another... but then the two queries could be merged into one to 
>> yield
>> the required (from the combined query) records in one go.
>>
>>> The would be more efficient when the purpose is just to
>>> determine existence and not necessarily examine contents.
>>
>> Do you have additional use cases in mind as to what you would do with
>> the resulting RUSIds?
>>
>>> On a related note, I don't know XPath/XQuery well but I assume that 
>>> it is
>>> possible to do something like "extract all records that have been 
>>> created in
>>> the last month". Is this correct?
>>
>> As the initial timestamp element in the RecordHistory follows a 
>> standard
>> format it should be searchable by XPath/Xquery... but I'm not an 
>> expert
>> in this.
>>
>> Can anyone clarify what XPath/XQuery can dow with timestamps?
>>
>> Steven
>
> -- 
> Sven van den Berghe
> Fujitsu Laboratories of Europe
> +44 208 606 4651
>
>
>
>