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
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?
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<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
>
> 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
>
> ...it resolves to the Turtle code, without using a SPARQL endpoint.
>
> Just like if you type 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: image.png]
>>
>> I want all the stuff inside the [] to show up as well!
>>
>>
>>
>> Steve
>>
>>
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