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 2455 South Rd E-mail: braddk@us.ibm.com Poughkeepsie, NY 12601-5400 United States From: Mike Beckerle <mbeckerle.dfdl@gmail.com> To: DFDL-WG <dfdl-wg@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@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://github.com/apache/incubator-daffodil/tree/master/daffodil-udf Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com Please note: Contributions to the DFDL Workgroup's email discussions are subject to the OGF Intellectual Property Policy -- dfdl-wg mailing list dfdl-wg@ogf.org https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ogf.org_mailman_listinfo_dfdl-2Dwg&d=DwICAg&c=jf_iaSHvJObTbx-siA1ZOg&r=Gr_9muStjOfOwiy6fErdWcH5wgoRUAPlQRqBfOga1GA&m=ZIuQDUl8l0q7HBntpAj1UFp45eWSFfbTV_nnsmPxKkk&s=5lO4qhKaq1zqFoCtCuWiH1pVtbbRN8C916AuWI8GZFg&e=
