On 19/10/2019 09:27, Mike Bendorf wrote:
Hi,
I work for Minerva Intelligence and I have a question about GraphQL. I
have been able to run a few queries on our endpoint to return basic
information from our taxonomies for ex.
|
query{
conceptSchemes{
label
}
}
|
which shows me every Concept Scheme, indicating endpoint is active.
But instead I would like to do the following:
- Return all Concepts for an *Specific Scheme*
You can access a specific resource with the (uri: "...") argument, e.g.
{
conceptSchemes(uri:
"http://topquadrant.com/ns/examples/geography#Geography";) {
label
}
}
Now, getting the root concepts is simple
{
conceptSchemes(uri:
"http://topquadrant.com/ns/examples/geography#Geography";) {
label
hasTopConcept {
label
}
}
}
while getting all concepts that are (recursively) children of the root
concepts is harder without some extra adjustments. This solution here
would give you the first level of children
{
conceptSchemes(uri:
"http://topquadrant.com/ns/examples/geography#Geography";) {
label
hasTopConcept {
label
narrower {
label
}
}
}
}
yet GraphQL isn't designed to return arbitrary nesting, as the structure
of the query needs to reflect the structure of the resulting JSON. If
you want to get a "flat" list of every concept under a certain schema,
then you'd either need to extend the GraphQL schema by a new field that
would allow you to flatten the structure, or fall back to SPARQL. In
SPARQL this would be
SELECT DISTINCT ?concept ?label
WHERE {
<http://topquadrant.com/ns/examples/geography#Geography>
skos:hasTopConcept ?topConcept .
?concept skos:broader* ?topConcept .
BIND (ui:label(?concept) AS ?label)
} ORDER BY ?label
which is possible because SPARQL has a * operator that recursively walks
a property.
To ask a similar query in GraphQL, the schema can be extended to create
a similar "flattened" field such as narrowerTransitive, which would be
inferred using a sh:values rule. In fact, the next TopBraid release will
have such a field, and it's defined in SHACL using
skosgeneric:Concept-narrowerTransitive
rdf:type sh:PropertyShape ;
sh:path skos:narrowerTransitive ;
sh:description "Gets the concept plus all narrower concepts,
recursively." ;
sh:name "narrower transitive" ;
sh:node skosgeneric:Concept ;
sh:nodeKind sh:IRI ;
sh:values [
sh:path [
sh:zeroOrMorePath [
sh:inversePath skos:broader ;
] ;
] ;
] ;
.
If this type of query is what you need, I could prepare a patch for you.
- Return *Broader or Narrower for an Specific Concept and for an
Specific Scheme*
As I said above, you can access a specific concept or scheme using
uri:"...". For example
{
concepts (uri: "http://topquadrant.com/ns/examples/geography#Germany";) {
label
narrower {
label
}
broader {
label
}
}
}
More documentation can be found in the Tutorial link near the GraphQL
link in TopBraid EDG, or online at
https://www.topquadrant.com/graphql/graphql-queries.html
HTH
Holger
This is a new installation of TopBraid and we have just added some
Taxonomies through the Import RDF File option.
Very much appreciated,
Mike
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