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some thoughts on https://www.w3.org/2013/dwbp/track/issues/222

From: Riccardo Albertoni <albertoni@ge.imati.cnr.it>
Date: Wed, 17 Feb 2016 17:32:01 +0100
Message-ID: <CAOHhXmTXZOK4_eFs23-ns+gAivANEAn7tRuDWxxr=fxwJ26vQw@mail.gmail.com>
To: DWBP Public List <public-dwbp-wg@w3.org>
Dear all,

I would like to share some thoughts on

This issue seems to be related to  different intertwined requirements,
req-A - the  need of indicating multivalue for a metric
req-B - the need of relating measures that are derived

Concerning req-A,   daq/dqv:value is a property of
daq:QualityObservation/DQV:QualityMeasure which  has  exactly 1
so we cannot indicate for a metric more than a value..

However, As mentioned by Werner, req-A is not a big issue as it can be
overcame by  split the multiple values in multiple metrics  provided that
you have a way to relate distinct metrics.

req-A sounds to me  a problem similar to the Multiple-measure observation
v.s. measure dimension, which is  discussed in the RDF cube section about
"handling multiple measure" [1].  We are basically coherent with the
 "measure dimension".
So at the end, we have already a way to support multi-value measure in
DQV/DAQ, so I would not bother too much about req-A  and, I'll try to close
 issue-222 simply  by  facing the req-B.

 let's focus  on req-B,

Relations  such as collaboratesWith, dependsOn, isUsedToObtain which are
 specified for the class
http://vocab.linkeddata.es/qmo/index.html#QualityMeasure seem to offer a
good start  for our discussion.

(a side comment: we might have an extra reason for taking inspiration from
EVAL is an ontology   defined by Filip Radulovic, who is also a member of
this group.)

Assuming X, a metric  returns /is composed by values Y1 Y2 Y3, we have to
define the  metrics X1 X2 X3,  and then state the relation among metrics,
e.g. if  Y1 is an aggregated value  obtained by Y2 and Y3, we can  express
that stating

X1 dependsOn X2, X3

X2, X3 are usedToObtain X1

Is that enough?
Do we need other  properties among metrics?


[1] https://www.w3.org/TR/vocab-data-cube/#dsd-mm

Riccardo Albertoni
Istituto per la Matematica Applicata e Tecnologie Informatiche "Enrico
Consiglio Nazionale delle Ricerche
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Received on Wednesday, 17 February 2016 16:32:49 UTC

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