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https://issues.apache.org/jira/browse/JENA-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16132018#comment-16132018
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ASF GitHub Bot commented on JENA-1372:
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Github user afs commented on the issue:
https://github.com/apache/jena/pull/273
This is just completing the coverage for F&O 3.1.
I don't think `fn:apply` replaces any custom function. There is a syntax
extension `CALL` (little know, undocumented; a toy from a long time ago) which
is very similar.
"FN_Collation" is related `fn:collation-key` has a specific, different
result type specified by the standard. (there isn't a `fn:collation` in
Functions and Operators 3.1 (F&O) so it is oddly named - it's wired to an ARQ
URI which is correct) Can I rename FN_Collation as "collation" to make the
naming systematic? (FN_* are F&O functions).
With `fn:apply` it would be nice is to be able to call `op:` things e.g.
`op:numeric-add` which aren't callable functions in F&O so by my reading,
aren't covered.
As all the operation code (`E_*`) are not inheriting from "Function", a bit
of adapter code is needed to register them. Some messing around with arities.
> New functions in F&O 3.1
> ------------------------
>
> Key: JENA-1372
> URL: https://issues.apache.org/jira/browse/JENA-1372
> Project: Apache Jena
> Issue Type: Improvement
> Components: ARQ
> Affects Versions: Jena 3.4.0
> Reporter: Andy Seaborne
> Priority: Minor
>
> F&O 3.1 adds some new functions : see
> https://www.w3.org/TR/xpath-functions-3/#substantive-changes.
> The ones of note are:
> * [fn:apply|https://www.w3.org/TR/xpath-functions-3/#func-apply] (dynamically
> applies a function to arguments supplied as an array) which is close to the
> extension {{CALL}}, so the code there could be extracted and morphed to be
> {{fn:apply}}.
> *
> [fn:collation-key|https://www.w3.org/TR/xpath-functions-3/#func-collation-key]
> (generates a key that can be used for collation-based matching). It is quite
> similar to role played by {{NodeValueSortKey}}.
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