[DFDL-WG] pre-proposal for new experimental feature: User-definedFunctions (UDF)

[Mike Beckerle]

These constructors do things like convert 123 to "123" and back. I want to
convert 65 (hex 41) to character (or string) "A", and back. That is,
interpret integers as unicode code points.

Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
www.tresys.com
Please note: Contributions to the DFDL Workgroup's email discussions are
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On Fri, Jan 10, 2020 at 4:00 AM Steve Hanson <smh at uk.ibm.com> wrote:

> Mike, can't you use the xs: constructor functions to convert integers to
> strings and back?
>
> We should also state that the schema (xs) namespace is reserved.
>
> Regards
>
> Steve Hanson
>
> IBM Hybrid Integration, Hursley, UK
> Architect, *IBM DFDL*
> <http://www.ibm.com/developerworks/library/se-dfdl/index.html>
> Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
> *smh at uk.ibm.com* <smh at uk.ibm.com>
> tel:+44-1962-815848
> mob:+44-7717-378890
> Note: I work Tuesday to Friday
>
>
>
> From:        Mike Beckerle <mbeckerle.dfdl at gmail.com>
> To:        Bradd Kadlecik <braddk at us.ibm.com>
> Cc:        DFDL-WG <dfdl-wg at ogf.org>
> Date:        10/01/2020 01:09
> Subject:        [EXTERNAL] Re: [DFDL-WG] pre-proposal for new
> experimental feature: User-definedFunctions (UDF)
> Sent by:        "dfdl-wg" <dfdl-wg-bounces at ogf.org>
> ------------------------------
>
>
>
>
> Well the intention is that people should use their own namespaces so as to
> prevent name conflicts, but we could enforce that by reject any use of dfdl
> or xpath functions namespaces.  I'm disinclined to do that because we
> probably will propose dfdlx extension features and use this mechanism to
> implement as well as future dfdl official functions. Also, there could be
> functions added to XPath and we'd want to implement them with this perhaps.
>
> For example I've been wanting functions that convert integers to
> characters and back. We don't have a way to do that but clearly that sort
> of thing comes up in DFDL.
>
> At minimum we should state that the dfdl, dfdlx,  and xpath functions
> namespaces are reserved.
>
>
> Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
> *www.tresys.com* <http://www.tresys.com>
> Please note: Contributions to the DFDL Workgroup's email discussions are
> subject to the *OGF Intellectual Property Policy*
> <http://www.ogf.org/About/abt_policies.php>
>
>
>
> On Thu, Jan 9, 2020 at 12:41 PM Bradd Kadlecik <*braddk at us.ibm.com*
> <braddk at us.ibm.com>> wrote:
> We don't have a java based approach to such things since our platform is
> very C/C++ centric so I appreciate that the requirement states the support
> in the DFDL schema must be language agnostic. With how you have it, it
> seems any namespace can be used so I'm wondering if the XPath and DFDL
> namespaces are going to be allowed. If so then are you opening the door to
> allow implementation of functions in the XPath namespace that aren't
> documented as supported or even a DFDL one that hasn't been supported yet
> by the DFDL parser?
>
> Regards,
>
> * Bradd Kadlecik*
> z/TPF Development
> ------------------------------
> *Phone:* 1-845-433-1573
> * E-mail:* *braddk at us.ibm.com* <braddk at us.ibm.com>
> 2455 South Rd
> Poughkeepsie, NY 12601-5400
> United States
>
>
>
> [image: Inactive hide details for Mike Beckerle ---01/09/2020 12:15:44
> PM---There's no write up in offical Experimental Feature proposa]Mike
> Beckerle ---01/09/2020 12:15:44 PM---There's no write up in offical
> Experimental Feature proposal form yet,, but there are these things a
>
> From: Mike Beckerle <*mbeckerle.dfdl at gmail.com* <mbeckerle.dfdl at gmail.com>
> >
> To: DFDL-WG <*dfdl-wg at ogf.org* <dfdl-wg at ogf.org>>
> Date: 01/09/2020 12:15 PM
> Subject: [EXTERNAL] [DFDL-WG] pre-proposal for new experimental feature:
> User-defined Functions (UDF)
> Sent by: "dfdl-wg" <*dfdl-wg-bounces at ogf.org* <dfdl-wg-bounces at ogf.org>>
>
> ------------------------------
>
>
>
> There's no write up in offical Experimental Feature proposal form yet,,
> but there are these things about the Daffodil UDF implementation that is in
> forthcoming daffodil 2.5.0.
>
>
> *https://cwiki.apache.org/confluence/display/DAFFODIL/Proposal%3A+Feature+to+Support+User+Defined+Functions*
> <https://cwiki.apache.org/confluence/display/DAFFODIL/Proposal%3A+Feature+to+Support+User+Defined+Functions>
>
> *https://github.com/apache/incubator-daffodil/tree/master/daffodil-udf*
> <https://github.com/apache/incubator-daffodil/tree/master/daffodil-udf>
>
> Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
> *www.tresys.com* <http://www.tresys.com>
> Please note: Contributions to the DFDL Workgroup's email discussions are
> subject to the *OGF Intellectual Property Policy*
> <http://www.ogf.org/About/abt_policies.php>
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