graphquery | query language and execution engine | JSON Processing library
kandi X-RAY | graphquery Summary
kandi X-RAY | graphquery Summary
GraphQuery is an easy to use query language, it has built-in Xpath/CSS/Regex/JSONpath selectors and enough built-in text processing functions. The most amazing thing is that you can use the minimalist GraphQuery syntax to get any data structure you want.
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QUESTION
I am trying to move data from a SPARQL endpoint to a JSONObject. Using RDF4J.
RDF4J documentation does not address this directly (some info about using endpoints, less about converting to JSON, and nothing where these two cases meet up).
Sofar I have:
...ANSWER
Answered 2020-Sep-11 at 06:05this fails because "Server responded with an unsupported file format: application/sparql-results+json"
In RDF4J, SPARQL SELECT queries are tuple queries, so named because each result is a set of bindings, which are tuples of the form (name, value). In contrast, CONSTRUCT (and DESCRIBE) queries are graph queries, so called because their result is a graph, that is, a collection of RDF statements.
Furthermore, setting additional headers for the response format as you have done here is not necessary (except in rare circumstances), the RDF4J client handles this for you automatically, based on the registered set of parsers.
So, in short, simplify your code as follows:
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Install graphquery
GraphQuery is currently only native to Golang, but for other languages, it can be invoked as a service.
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