Hi Matt,
do you have a small example file of what you have tried so far, and
where it failed? You will understand that it is quite difficult and time
consuming to reproduce exactly the same scenario that you had. In
principle I see no problems with your proposed solution, although
SPINMap does have its limits and sometimes it is indeed faster to just
rely on SPARQL CONSTRUCT rules to do the work.
Holger
On 10/8/2015 3:24, Matt McMinn wrote:
I'm working on a proof of concept to explore how to connect SPARQL
data from different data sources. I have two OWL classes, each from
its own data model, representing information that I've extracted from
two different systems. The data models look like:
|Order: id, itemName, quantity Item: id, name, unitPrice |
What I would like to do is connect these two types together using the
Order.itemName and Item.name fields, and create a new field on the
Order class to store the total price for the order (order.quantity *
item.unitPrice).
This would be fairly trivial to do with SPARQL, but we're looking at
TopBraid Composer due to its graphical mapping capabilities, which
would be easier for an end user to work with. From my understanding,
using a SPINMap we should be able to easily - and graphically - define
the above property, but I'm having some problems getting things
connected together.
I've been following the tutorial in the TBC Help under "Application
Development Tools/SPIN/Ontology Mapping with SPINMap", but I'm having
problems just trying to get a simple attribute mapped over. Based on
that help document, on the Diagram tab I'm drawing a line from the
Item Class to the Order class and selecting the changeNamespace
function with an appropriate value. I then drew a line from the Item
class to a new property on the Order class, totalPrice, and set the
function to equals, just to see if I can get the property to show up.
After running the inferences, I run a SPARQL query, and the totalPrice
field is empty for all of my Order classes.
I know this description was confusing - any idea what I should be
doing to make this work? Is a SPINMap even the right tool for this,
or is just straight SPARQL the way to go?
Thanks
Matt
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