> I have tried a query such as the following, but this does not work without
> the variable ?s1 being declared in the WHERE clause:
> INSERT {
> ?s1 a class1;
> ?p1 ?o
> }
> WHERE
> {?s a class;
> ?p ?o}
You can definitely insert new triples with SPARQL but all your parameters
need to get bound in the WHERE clause. I don't quite understand what you
are trying to do in the above expression. What would ?s1 get bound to?
There is no way for SPARQL to know. Here is a simple example from a
tutorial I'm doing on SPARQL where I DELETE triples for phone numbers that
aren't of the format nnn-nnn-nnnn:
DELETE {?emp pizza:hasPhone ?badphone}
WHERE {?emp pizza:hasPhone ?badphone.
FILTER(!regex(?badphone, "\\d{3}-\\d{3}-\\d{4}"))}
But this could also be used to assert new information. For example, if I
had a property called hasVerifiedPhone for numbers that are formatted
appropriately I could do (note I removed the not from the FILTER):
INSERT {?emp pizza:hasVerifiedPhone ?goodphone}
WHERE {?emp pizza:hasPhone ?goodphone .
FILTER(regex(?goodphone , "\\d{3}-\\d{3}-\\d{4}"))}
Here is an example of a query where I bind parameters to an IRI (note:
there are easier ways to do this but just to show an example of binding
parameters in the WHERE and using them in the INSERT) and then insert them
into the knowledge graph. I know some of the data looks bad, that is part
of the tutorial, to find and transform bad and missing data, using both
SPARQL and SHACL:
INSERT {?mngr a pizza:Employee;
pizza:hasPhone "415-5554567";
pizza:hasPhone "123-345-4567";
pizza:ssn "321-23-4532".
?chf a pizza:Employee;
pizza:hasPhone "415-555-1234";
pizza:ssn "333-22-4444".
?wt1 a pizza:Employee;
pizza:hasPhone "123-234-3434";
pizza:ssn "123456666".
?wt2 a pizza:Employee.}
WHERE {
BIND (IRI("
http://www.semanticweb.org/pizzatutorial/ontologies/2020/PizzaTutorial#Manager";)
AS ?mngr).
BIND (IRI("
http://www.semanticweb.org/pizzatutorial/ontologies/2020/PizzaTutorial#Chef";)
AS ?chf).
BIND (IRI("
http://www.semanticweb.org/pizzatutorial/ontologies/2020/PizzaTutorial#Waiter1";)
AS ?wt1).
BIND (IRI("
http://www.semanticweb.org/pizzatutorial/ontologies/2020/PizzaTutorial#Waiter2";)
AS ?wt2).
}
Hope that helps,
Michael
On Fri, Feb 12, 2021 at 9:38 AM Dan Segal <dan.segal.w...@gmail.com> wrote:
> Is it possible to dynamically create a new instance based on a query
> result?
>
> For example, let's say that we assert:
>
> ?s ?p ?o
>
> We would then want to dynamically create a new instance ?s1 with a graph
> such as:
>
> ?s1 ?p1 ?o
>
> I have tried a query such as the following, but this does not work without
> the variable ?s1 being declared in the WHERE clause:
>
> INSERT {
> ?s1 a class1;
> ?p1 ?o
> }
>
> WHERE
> {?s a class;
> ?p ?o}
>
>
> I have also tried the following, but it returns an error *"INSERT can
> only modify the default graph"*
>
> INSERT {
> GRAPH <urn:this_graph>
> {
> ?s1 a class1;
> ?p1 ?o
> }
> }
>
> WHERE
> {?s a class;
> ?p ?o}
>
> Is there a way to create these new ?s1 instances automatically based on
> the query conditions?
>
> Thank you!
>
> Dan
>
>
>
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