Make use of Jena's extension rsparql extension mechanism

SmartDataAnalytics / RdfProcessingToolkit

Command line interface based RDF processing toolkit to run sequences of SPARQL statements ad-hoc on RDF datasets, streams of bindings and streams of named graphs with support for processing JSON, CSV and XML using function extensions

https://smartdataanalytics.github.io/RdfProcessingToolkit/

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Make use of Jena's extension rsparql extension mechanism #7

Closed Aklakan closed 1 year ago

Aklakan commented 5 years ago

Jena already provides SPARQL command line tooling with extension support. As sparql-integrate does a bit more than just registering extensions (e.g. it supports processing sequences of queries from multiple files), it does not seem possible to integrate completely into (r)sparql (i.e. having sparql-integrate as only a command line wrapper that invokes (r)sparql with the appropriate extensions).

Yet, there are 2 things we can do:

Make it possible to use sparql-integrate extensions via jena; which means documenting the namespaces for the extensions and testing it with jena's native command line tooling
Extend sparql-integrate to support the same extension points as (r)sparql

Aklakan commented 1 year ago

By now rpt integrate supports --set and --explain (pendant of '--verbose'). For the deb and rpm packages, custom jar files can be added to the class path via EXTRA_CP.

Example:

EXTRA_CP='./GTFS-Functions.jar' rpt integrate \
  '(<java:org.moin.rml.functions.GTFSFunctions#timeNormalize>("28:02:00") AS ?x) {}' --out-format csv
x
4:02:00