[DFDL-WG] proposal: add fn:trace function to DFDL

[Steve Hanson]

Agreed not to add this. See WG call minutes.

Regards

Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848



From:   Mike Beckerle <mbeckerle.dfdl at gmail.com>
To:     dfdl-wg at ogf.org, 
Date:   16/07/2013 15:03
Subject:        [DFDL-WG] proposal: add fn:trace function to DFDL
Sent by:        dfdl-wg-bounces at ogf.org




I have found working with DFDL expressions basically impossible without 
the fn:trace function to help debug them.

I am not sure how I would write a tutorial about expressions without using 
fn:trace in it to illustrate what is going on in the expressions. In the 
interests of keeping the tutorials portable I suggest we add the fn:trace 
function.

fn:trace($value as item()*, $label as xs:string) as item()*
Summary: Provides an execution trace intended to be used in debugging 
queries.
The notation item()* means any node sequence including an empty node 
sequence. 
The input $value is returned, unchanged, as the result of the function. In 
addition, the inputs $value, converted to an xs:string, and $label may be 
directed to a trace data set. The destination, format, and ordering of the 
output of this trace data set is implementation specific.
Related Issue: I don't see any language in the spec where we flat out say 
that a node sequence in the expression language is a sequence of Infoset 
Element Information Items. We should add this near the begining of section 
23. 


-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com
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