On 8/8/2013 8:01, Steve Ray (CMU) wrote:
Hi,
I'm having trouble mapping two related classes in class A (in this
case "json") to two similarly related classes in class B (in this case
"cmusc"). I was planning to use the spinmap:targetResource function,
but in this case it doesn't seem to allow this function to cross to a
second class (see the red triangle in the attached .png).
This must come up frequently, so I must be missing something, yes?
The short answer is that you need a mapping context (e.g. buildURI)
between the two classes before you can add mappings.
A bit of background. If you define a mapping context between two
classes, then you tell the system how to translate the URI of a resource
on the left into URIs for the class on the right. These might be equal
or URI derivation functions such as buildURI. Then when you connect two
properties, the engine can use the context to figure out the source
subject and the target subject for the new triple, while the value
itself will be computed using the transformation function. This is how
it works when you start a connection at a *property* - the
transformation will use the *value* of the given property as its
starting point.
Now, if you define a mapping starting with the upper right corner of a
class, then you tell the system to use the URI of the source instance
itself as input to the transformation function. Indeed this could be the
spinmap:targetResource function, or any other that takes a URI resource
as its first input argument. If the system would allow you to link the
URI to a property in any unrelated class on the right, then there would
be no context to figure out what the source and target subjects should
be. To prevent this, the UI disallows creating such links.
I am not exactly sure what you are trying to model, but I assume you
want to map all values from json:device_agent to cmusc:hasAgent. So just
drag a line between those. Then select spinmap:targetResource with the
context from the lower mapping so that SPINMap can turn the
json:Device_Agent into the corresponding smusc:DeviceAgent.
HTH
Holger
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