[DFDL-WG] Fw: Agenda for DFDL WG Call

[Steve Hanson]

I can't make the call today as I am travelling but there are a couple of 
things I'd like to raise. These have come to light while I have been 
thinking about white space issues.

1)  This is related to the white space discussion around entities. One way 
to handle the situation where the terminator can vary is to allow the DFDL 
markup properties (dfdl:terminator, dfdl:separator, etc) to be lists, just 
like we already do for dfdl:nullValues. (IBM's WTX has this capability).

2) We've allowed the prefix of a prefixed length to be explicitly 
described as a non-event field using dfdl:lengthPrefixType. Should we 
permit this for markup properties?  Instead of supplying a list of 
possible values, you supply a simple type with enums for the values. This 
could be viewed as an alternative/complementary to 1). There is a 
limitations - because we are using XSDL enumeration facet, we are 
constrained by its syntax so I don't see how we could use our own entity 
scheme or expressions. Also, I suspect that enums are inherently unordered 
so we'd need a way of saying which to use on output (use an element of 
simple type and use XSDL default attribute?).  Lastly, we should not force 
a user to model an initiator as an element/type - most users just see it 
as a piece of text so just entering the value must still be allowed. 

3) Let's say my delimiter is dynamically defined at the start of the data, 
like EDI allows. We would handle that in DFDL using an expression or 
variable. However, EDI also allows random white space to appear after the 
delimiter. Can our expression/entity syntaxes handle this?  Does this 
preclude use of 1) or 2)? 

Regards, Steve

Steve Hanson
WebSphere Message Brokers
Hursley, UK
Internet: smh at uk.ibm.com
Phone (+44)/(0) 1962-815848
----- Forwarded by Steve Hanson/UK/IBM on 23/01/2008 08:27 -----

"Mike Beckerle" <mbeckerle.dfdl at gmail.com> 
Sent by: dfdl-wg-bounces at ogf.org
23/01/2008 04:18

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Subject
[DFDL-WG] Agenda for DFDL WG Call







I have these items for the agenda.

1) review of entities proposal

2) OGF 22 - our session is Monday 2/25 at 4:15pm. 

Other agenda items?

...mikeb

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