querying child data-properties on RDF-store - sparql

Question

I have, in my ontology, an entity named "person" that has a class child named "member". Some like this (indenting for indicate the hierarchy),
person
member
Also, I have some attributes (dataProperty), associated with "person", and another attributes associated with "member". Specifically, that attributes could be phone numbers. I propose a hierarchy of attributes in this way,
phone (domain: person)
office-phone (domain: member)
office-phone-1 (domain: member)
office-phone-2 (domain: member)
personal-phone (domain: person)
I'm doing the following,
SELECT ?s ?attr ?data
WHERE
{
value ?attr {:phone} .
?s rdf:type :member .
?s ?attr ?data .
}
to get all phone-numbers,
instance-member :phone "value-of-personal-phone"
instance-member :phone "value-of-office-phone-1"
instance-member :phone "value-of-office-phone-2"
but,
how could I ONLY to get the two office-phone WITHOUT USE the specific attribute ":office-phone"?? Some owl: restriction or definition??
Thanks!

Answer 1

First, you have to use the property hierarchy in your data, otherwise, this can't work (it would be good if you provide proper sample data next time...):
#prefix : <http://example.org/> .
#prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
#prefix rdfs: <http://www.w3.org/2000/01/rdf-schema/> .
:officePhone rdfs:subPropertyOf :phone .
:officePhone1 rdfs:subPropertyOf :officePhone .
:officePhone2 rdfs:subPropertyOf :officePhone .
:personalPhone rdfs:subPropertyOf :phone .
:instance-member rdf:type :member .
:instance-member :personalPhone "value-of-personal-phone" .
:instance-member :officePhone1 "value-of-office-phone-1" .
:instance-member :officePhone2 "value-of-office-phone-2" .
Regarding the querying, there are at least two options:
1) The triple store supports reasoning, RDFS would be enough in your example - then your query would be sufficient.
2) You rewrite your query such that the property hierarchy is taken into account using SPARQL 1.1 property paths:
prefix : <http://example.org/>
prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema/>
SELECT ?s ?attr ?data
WHERE
{
values ?p {:officePhone}
?s rdf:type :member .
?attr rdfs:subPropertyOf* ?p .
?s ?attr ?data .
}
Result:
----------------------------------------------------------------
| s | attr | data |
================================================================
| :instance-member | :officePhone1 | "value-of-office-phone-1" |
| :instance-member | :officePhone2 | "value-of-office-phone-2" |
----------------------------------------------------------------

Answer 2

...I got it in a similar way, showing the superproperty, restrincting the domain and including a distinct...
SELECT distinct ?s ?attr_father ?data
WHERE
{
values ?attr_father {:phone} .
?s rdf:type :member .
?attr rdfs:subPropertyOf* ?attr_father .
?attr rdfs:domain :member .
?s ?attr ?data .
}
In this way, we get,
instance-member :phone "value-of-office-phone-1" .
instance-member :phone "value-of-office-phone-2" .
Regards!