Rob Vesse created JENA-270:
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Summary: Support dynamic function invocation in ARQ
Key: JENA-270
URL: https://issues.apache.org/jira/browse/JENA-270
Project: Apache Jena
Issue Type: New Feature
Components: ARQ
Affects Versions: ARQ 2.9.2
Reporter: Rob Vesse
Assignee: Rob Vesse
Per my suggestion to the SPARQL Working Group I am proposing a new built in
CALL() which can be used in SPARQL queries for dynamic function invocation.
CALL with no argument returns null
CALL with some arguments evaluates the first argument, sees if the result is a
URI (if not errors) and if so tries to generate a function from it and invoke
it with the arguments to that invocation being the remaining arguments to CALL
I have implemented a prototype implementation of this in the ARQ language which
I have committed to Trunk, others with more knowledge of expression and
function evaluation in ARQ may have suggestions on how to improve the
implementation
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