Steve, Tim and I discussed discriminators
so more, particularly transferring the WTX model to dfdl.
We think we were successful and cam
up with the following semantics
- A dfdl:discriminator resolves
the presence of its parent group (sequence or choice). Note this isn't
necessarily a point of uncertainty
- If the parent group is the content
model for a complex types then the instance of the element of the complex
type also exists (that is: if the group is only defining the content of
a complex element then the discriminator propagates from the group to the
element automatically)
Alan Powell
MP 211, IBM UK Labs, Hursley, Winchester, SO21 2JN, England
Notes Id: Alan Powell/UK/IBM email: alan_powell@uk.ibm.com
Tel: +44 (0)1962 815073
Fax: +44 (0)1962 816898
----- Forwarded by Alan
Powell/UK/IBM on 09/12/2009 12:51 -----
| From:
| Alan Powell/UK/IBM@IBMGB
|
| To:
| dfdl-wg@ogf.org
|
| Date:
| 24/11/2009 15:50
|
| Subject:
| [DFDL-WG] DFDL Discriminators discussion |
Following on from Stephanie's WTX example
on last weeks call I think that restricting discriminator to resolving
their parents provides the level of control that we need.
I have updated Mike's example with this
syntax
Note I have flattened the schema as
I find that easier to read and 'enhanced' some the the dfdl properties.
To illustrate the flexibility if 'L'
had a test="{ fn:exists( . ) }" discriminator then if an L record
had been found then the parse would fail rather than backtracking to Blob.
Alan Powell
MP 211, IBM UK Labs, Hursley, Winchester,
SO21 2JN, England
Notes Id: Alan Powell/UK/IBM
email: alan_powell@uk.ibm.com
Tel: +44 (0)1962 815073
Fax: +44 (0)1962 816898
Unless stated otherwise above:
IBM United Kingdom Limited - Registered
in England and Wales with number 741598.
Registered office: PO Box 41, North
Harbour, Portsmouth, Hampshire PO6 3AU
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#### testDiscriminator2.dfdl.xml moved to MyAttachments
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3AU