Hi Tim,
have a look at spif:invoke:
spif:invoke (spin:Function)
Calls another SPARQL function specified by a URI resource (?arg1), with
additional arguments passed into from ?arg2 onwards. This can be used to
dynamically call functions, the URI of which is now known statically.
The result of the function call will be passed on as result of the
invoke call. The function can also be a binary built-in SPARQL function
using the SPIN function identifiers from the SPL ontology. For example,
sp:gt will be executed as ?left > ?right.
Arguments
*sp:arg1* (spin:Function): The URI resource defining the function to call.
*sp:arg2*: [Optional] The first argument of the function call.
*sp:arg3*: [Optional] The second argument of the function call.
*sp:arg4*: [Optional] The third argument of the function call.
*sp:arg5*: [Optional] The forth argument of the function call.
Cheers,
Holger
On 2/22/2013 12:30, Tim Smith wrote:
I have a use case where I'm processing a bunch of IDs from a
relational database. For each ID, I must determine the class for
which it is an instance by using a regex filter.
I've setup a "helper" class that defines (via instances) a number of
processing parameters that are used to parse the ID and construct
instances, etc...
In an instance of the helper class, I store the URI of of a SPIN
function that is to be used, for example, to parse the ID into the
relevant parts.
example: help:instance1 help:idParser pgspin:parseID1
My question is:
Is it possible to use a variable to hold the URI for a SPIN function
and still execute the function including the ability to pass arguments
to the function?
Here's how I was thinking about this:
SELECT *
WHERE {
?x a help:IDHelper .
?x help:idParser ?parser .
BIND (?parser("ID1234567") as ?parsedID)
}
Thanks in advance for your help,
Tim
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