Strategies for inference over lists of values

From: Graham Klyne <gk@ninebynine.org>
Date: Fri, 27 Feb 2004 17:42:02 +0000
Message-Id: <5.1.0.14.2.20040227172342.00b8f870@127.0.0.1>
To: RDF interest group <www-rdf-interest@w3.org>, <www-rdf-logic@w3.org>
```
Hi,

I'm wondering what strategies folks are using for inference over
collections (lists) of values in RDF (other than resorting to ad-hoc
code).  (Maybe also over containers, but the closure of lists makes the
problem easier to define.)

A simple example would be the selection of the maximum value from a list; e.g.

given:

_:weatherToday
:hourlyTemperatures
( "10"^^xsd:integer "12"^^xsd:integer "15"^^xsd:integer
"16"^^xsd:integer "14"^^xsd:integer "17"^^xsd:integer
"13"^^xsd:integer "12"^^xsd:integer "10"^^xsd:integer
"9"^^xsd:integer  "7"^^xsd:integer  "6"^^xsd:integer ) .

how to deduce:

_:weatherToday
:maxTemperature "17"^^xsd:integer .

A more complex example might be the extraction of a mean value given a list
of sample values and observed frequencies:

_:experiment
:samples ( _:s1 _:s2 _:s3 _:s4 ) .
_:s1 :value "10"^^xsd:integer ;
:freq  "2"^^xsd:integer .
_:s2 :value "20"^^xsd:integer ;
:freq  "5"^^xsd:integer .
_:s3 :value "30"^^xsd:integer ;
:freq  "6"^^xsd:integer .
_:s4 :value "40"^^xsd:integer ;
:freq  "3"^^xsd:integer .

to deduce:

_:experiment
_meanValue "26"^^xsd:integer

This can be done by generating intermediate resources that relate to
accumulated values from the list, but this approach rapidly becomes very
ugly.  I have some half-baked ideas for a tidier approach, but was hoping
that someone might have a fully-baked solution.

#g

------------
Graham Klyne
For email:
http://www.ninebynine.org/#Contact
```
Received on Friday, 27 February 2004 12:42:24 UTC

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