[dfdl-wg] Notes from call 2005-04-13

[mike.beckerle at ascentialsoftware.com]

Here's my notes:
 
DFDL WG Semi-Weekly Call 2005-04-13
 
Attendees
 
Jim Meyers
Tara Talbot
Steve Hanson
Mike Beckerle
Karen Loughran
 
Agenda
 
1) Scope of the v1.0 specification (not to be confused with "scoping of
annotations")
2) Discussion of scoping of annotations based on Ascential posting.
3) Planning of agenda for upcomign F2F meeting on May 11.12, 13, at
Ascential in Westborough, MA
    Suggested topics so far: 
- Review of TD Model and extension to cover DFDL properties
- Examples from the Ascl prototype - go through several line by line to see
what we do and don't like about them- 
 
F2F Who's coming: 
 
Mike Beckerle
Jim Meyers
Tara Talbot
Suman Kalia
Steve Hanson
 
Who's not coming:
Martin Westhead
Karen Loughran
 
Scope of v1.0 Spec. -
 
Steve Hanson - don't bite off too much for v1.0
- QSAM formats with data split over other pieces.
- Encrypted sections and how we handle those. 
- DFDL Validation i.e., check that the binary data is valid according to the
DFDL Schema. 
  (It's alot of work to do a validating parser. EDIFACT, X12 and such
require more complex validation than just. Things like field a if present
means field b should NOT be present.)
 
 
 
Jim Meyers - multi-layer stuff is what supports those things. 
 
Scoping rules discussion - 
 
Defer discussion - 
 
Agenda for F2F - 
 
- model and parser behavior aspects: rules for default values, null
handling, how to figure out how to figure ot the length precedence rules,
etc.
- open content - tagged, but some of the tags are unknown. HL7 people put
extra fields into a group. Happens with every format though, not just tags.
Polymorphic chunks. xsd:all - unordered data. 
- PNNL project and Jaxme implementation - here's what's on the ground. Focus
should be on how that's changing the language. 
- Scoping of annotations 
- extensibility mechanisms (low prio)
- multi-dimensional arrays (low prio)
- reader/writier/filter/function - topic 
 
- don't bother with a deep dive on any implementation.  
 
 
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