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conversion:Only_if · timrdf/csv2rdf4lod-automation Wiki · GitHub
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conversion:Only_if
Tim L edited this page Jul 30, 2013
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8 revisions
conversion:Only_if is a conversion:Enhancement.
In a table where we keep track of how long each person's boat is, we can represent the implicit boat using a conversion:ImplicitBundle
name,length
Susy,0
Johny,10
We can avoid asserting a boat length of 0 with interpret null:
<Susy>
foaf:name "Susy" ;
e1:owns implicit_owns:boat_2 ;
ov:csvRow "2"^^xsd:integer .
<Johny>
foaf:name "Johny" ;
e1:owns implicit_owns:boat_3 ;
ov:csvRow "3"^^xsd:integer .
implicit_owns:boat_2 a local_vocab:Boat .
implicit_owns:boat_3 a local_vocab:Boat ;
e1:length "10"^^xsd:integer .
But, in some cases we may want to avoid asserting that there is a boat (implicit_owns:boat_2) at all. We can do this by typing the bundle as conversion:Only_if. When an ImplcitBundle is also typed to conversion:Only_if, then it is only asserted if some cell values lead to a triple describing the ImplicitBundle. If no cell values lead to triples describing the ImplicitBundle, then the instance is not asserted.
:a_bundle
a conversion:ImplicitBundle, conversion:Only_if; ## Add a second type.
conversion:property_name "Owns";
conversion:type_name "Boat";
.
<Susy>
foaf:name "Susy" ;
## Ownership of implicit_owns:boat_2 no longer asserted because no cells described the boat.
ov:csvRow "2"^^xsd:integer .
<Johny>
foaf:name "Johny" ;
e1:owns implicit_owns:boat_3 ;
ov:csvRow "3"^^xsd:integer .
### implicit_owns:boat_2 no longer asserted as a Boat.
implicit_owns:boat_3 a local_vocab:Boat ;
e1:length "10"^^xsd:integer .
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