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On Mon, Jan 11, 2016 at 4:25 AM, Hondros, Constantine (ELS-AMS)C.Hondros@elsevier.com wrote: Hi Christian,
I should have read the spec more fully. So clearly I will need to create a custom grouping key as the atomization process (fn:data) basically passes over attribute values:
let $val := <affiliation> <organization>Institut für Organische Chemie der Universität Heidelberg</organization> <country iso-code="DEU"/> </affiliation>
return data($val)
=> results in "Institut für Organische Chemie der Universität Heidelberg" as a grouping key.
Thanks for pointing me in the right direction.
C.
-----Original Message----- From: Christian Grün [mailto:christian.gruen@gmail.com] Sent: 09 January 2016 18:49 To: Hondros, Constantine (ELS-AMS) Cc: basex-talk@mailman.uni-konstanz.de Subject: Re: [basex-talk] group-by behaviour for clustering XML fragments
Hi Constantine,
Incidentally, BaseX is simply unbelievably fast at executing this – a million fragments clustered and written out to another DB in 16 seconds on a laptop. My congratulations on an amazing product.
Thanks!
If I use the entire XML fragment as a grouping key, something like this: [...] … then will the grouping be equivalent to the functionality of the deep-equal function?
A grouping keys is the atomized value of a grouping variable [1,2]. If this value is prone to be ambiguous, you can create an arbitrary other value, e.g. as follows:
group by $val := string-join($a/*, '; ')
Cheers, Christian
[1] http://docs.basex.org/wiki/XQuery_3.0#group_by [2] http://www.w3.org/TR/xquery-30/#id-group-by
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