On 2021-03-18 3:08 pm, [email protected] wrote:
To take this one step further, EDG supports using SHACL to provide
view options in the UI.
it strikes me this is equally relevant to the serialisation of a
specific object in TTL (or anything else).
Is there an equivalent service that can do this?
One option that occurred to me would be to create a graphQL template
based on a nodeshape - then the result (currently serialised as json)
could perhaps be serialised as json-ld and ttl
GraphQL is not good at recursion - it can only produce JSON that has a
similar structure to the query clauses. So a query with depth 3 can only
go 3 levels of bnodes deep. In cases like OWL rdfs:subClassOf ...
owl:Restriction ... where the structure of the classes is difficult to
predict it will be an overkill to first try to build such a complex
GraphQL query.
In SWP this can be achieved through a recursive helper element that
walks objects as long as they are blank nodes and collects all triples
in the ui:tempGraph. In Active Data Shapes (ADS) such recursion is
easily done because it's JavaScript, yet ADS doesn't have a simple way
to produce Turtle yet.
This also leads to the question of how to best work with blank nodes
in SHACL
this seems to be bypassed in the UI - it does this traversal with a
function.
query: "query getSuitableViewShapes($uri: ID!) {↵ resources(uri: $uri) {↵
Is there any way of doing something similar with a user defined shape
that can traverse blank nodes?
Potentially yes, and I probably prototyped something along those lines
at some stage.
In cases like our form editors and viewers, the system only fetches the
top-level triples and if it's a blank node then each widget may make
additional requests to walk the structure. For many types of blank nodes
we also already have string/label renderers.
Holger
On Thursday, 18 March 2021 at 11:43:14 UTC+11 Holger Knublauch wrote:
On the server that hosts your namespace, can't you set up a
rewrite that generates
http://mytopbraid...:8083/tbl/sparql?query=DESCRIBE%20
<http://mytopbraid...:8083/tbl/sparql?query=DESCRIBE%20><XY>
where you replace XY with the URL-encoded URI of the resource that
was requested? See e.g.
https://httpd.apache.org/docs/2.4/rewrite/remapping.html
<https://httpd.apache.org/docs/2.4/rewrite/remapping.html>
but this sounds like a problem someone must have solved before.
Given that you plan to call a SWP service, how do you currently
redirect the URLs to invoke said service?
You cannot use DESCRIBE in ui:TurtleService and I am not aware of
a magic property that would get all depending triples of the
concise bounded description. SPARQL is not good at recursion.
Holger
On 2021-03-18 10:11 am, Steve Ray wrote:
Interesting. The DESCRIBE query sounds intriguing, but I need to
create the .ttl files so that when somebody types
http://qudt.org/schema/qudt/Unit <http://qudt.org/schema/qudt/Unit>
...it resolves to the Turtle code, without using a SPARQL endpoint.
Just like if you type http://qudt.org/vocab/unit/A
<http://qudt.org/vocab/unit/A> you get the definition of the
Ampere. (Content negotiation will give you either html or ttl
depending on the header, so a browser yields html).
Can I use DESCRIBE inside a ui:TurtleServices web service? I
tried with ui:update, but that expects an INSERT or DELETE. Am I
making this more complicated than it needs to be?
Steve
On Wed, Mar 17, 2021 at 4:08 PM Holger Knublauch
<[email protected]> wrote:
Hi Steve,
you could just use SPARQL DESCRIBE queries, which will
compute the graph for a resource including its depending
blank nodes, e.g.
DESCRIBE
<http://topquadrant.com/ns/examples/geography#Country>
<http://topquadrant.com/ns/examples/geography#Country>
via the SPARQL endpoint.
Holger
On 2021-03-18 9:01 am, Steve Ray wrote:
Hi,
I'm using SWP to generate a bunch of .ttl files that will be
available to the LinkedData community for resolving class
definitions. I'm hoping to use the code below that works
fine for our instance data, but this code doesn't do the
right thing when there are bnodes (such as restriction
classes).
This is written as a ui prototype that is a subClass of
ui:TurtleServices.
*Is there some setting to have it also serialize the
bnodes*? Here's the ui:prototype code:
<*ui:group* let:*extension*=".ttl"
let:*myGraphU*="*{=* ui:graphWithImports(*IRI*(*?graph*)) *}*"
let:*myInstance*="*{=**IRI*(*?instance*) *}*"
let:*newPath*="*{=* *CONCAT*("/generatedFiles/",
xsd:string(*?folder*), "/") *}*">
<*ui:debug*>
*<span>*Inside VersionlessIndividual. Value of ?newPath is
*{=*?newPath*}**</span>*
</ui:debug>
<*ui:dumpScope* ui:message="AAA:VersionlessIndividual,
newPath= *{=* ?newPath *}*"/>
<*ui:group* let:*localName*="*{=* afn:localname(?myInstance)
*}*">
<*ui:group* let:*newFile*="*{=**CONCAT*(?newPath,
?localName, ?extension) *}*">
<*ui:dumpResultSet* ui:message="AAA:VersionlessGraph,
newUnit= " ui:resultSet="*{=* *?instance* *}*"/>
<*ui:setContext* ui:silentTransactions="true">
<*ui:setContext* ui:queryGraph="ui:tempGraph">
/<!-- Clear out the working graph-->/
<*ui:update* ui:updateQuery="*{!*
*DELETE* {
*GRAPH* ui:tempGraph {
?s ?p ?o .
} .
}
*WHERE* {
?s ?p ?o .
} *}*"/>
<*ui:update* ui:updateQuery="*{!*
*INSERT* {
*GRAPH* ui:tempGraph {
?myInstance ?p ?o .
} .
}
*WHERE* {
*GRAPH* ?myGraphU {
?myInstance ?p ?o .
} .
} *}*"/>
<*ui:return*/>
</ui:setContext>
</ui:setContext>
</ui:group>
</ui:group>
</ui:group>
...which produces the following file:
image.png
I want all the stuff inside the [] to show up as well!
Steve
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