[DFDL-WG] short form on xs:schema?

[Steve Hanson]

Will discuss on today's WG call...

Regards

Steve Hanson
Architect, 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:     Suman Kalia <kalia at ca.ibm.com>
Cc:     dfdl-wg at ogf.org
Date:   05/12/2011 14:14
Subject:        Re: [DFDL-WG] short form on xs:schema?
Sent by:        dfdl-wg-bounces at ogf.org



Yes I was thinking of this as the short form for setting default 
properties.
I really came up with this while trying to create very compact unit tests 
for the UofI Daffodil software. This is written in Scala (really the next 
programming language you should learn. Runs on JVM, fully integrates with 
Java, lots of other goodness.) Here's an example, I elipsed out the 
namespace properties. 
def testInt42() {
  val data = bytesFromChars("\u0000\u0000\u0000\u002A")
  // nice: scala has built in XML support. No string quoting hell, just 
write the XML (hey, that rhymes :-)
  val testSchema = <xs:Schema ...namespace crud... 
dfdl:encoding="iso-8859-1" dfdl:byteOrder="bigEndian" ...>
                    <xs:element name="testElement" type="xs:int" 
dfdl:representation="binary" dfdl:lengthKind="implicit" />
                   </xs:Schema>
  val res = parser(testSchema).data(data).parse()
  val ans = (res \ "testElement")(0).text.asInt
  assertEquals(42, ans)
}
I think the same principles will apply to tutorial and expository 
materials about DFDL. I.e., I like being able to put default format 
properties directly on the xs:schema element!
This will really only be viable for very small examples where you only 
need a few properties. That said, those are useful for people learning the 
language, and trying it out via APIs.
But, I had never seen it before, and wasn't discussed, so I looked for it 
in the spec, and found nothing saying you can't do it. The language in the 
spec suggests it is allowed.
...mikeb
On Dec 4, 2011 7:55 PM, "Suman Kalia" <kalia at ca.ibm.com> wrote:
One way to view this annotation would be as if it is defined on the 
 default format at the xs:schema..   Question would be what if dfdl:format 
at xs:schema also has dfdl:encoding specified - which one would win ?.. 


Suman Kalia 
IBM Canada Lab 
WMB Toolkit Architect and Development Lead 
Tel: 905-413-3923 T/L 313-3923 
Email: kalia at ca.ibm.com 

For info on Message broker 
http://www.ibm.com/developerworks/websphere/zones/businessintegration/wmb.html 






From:        Mike Beckerle <mbeckerle.dfdl at gmail.com> 
To:        dfdl-wg at ogf.org 
Date:        12/02/2011 05:46 PM 
Subject:        [DFDL-WG] short form on xs:schema? 
Sent by:        dfdl-wg-bounces at ogf.org 




I don't know that we ever talked about this.

Most schema constructs support short form

<xs:element ... dfdl:encoding="utf-8" />

Does the xs:schema itself support short form for the "default" format 
properties?

<xs:schema xmlns:xs="...."
    dfdl:encoding="utf-8">
...
</xs:schema>



-- 
Mike Beckerle | OGF DFDL WG Co-Chair 
Tel:  781-330-0412
--
 dfdl-wg mailing list
 dfdl-wg at ogf.org
 http://www.ogf.org/mailman/listinfo/dfdl-wg --
  dfdl-wg mailing list
  dfdl-wg at ogf.org
  http://www.ogf.org/mailman/listinfo/dfdl-wg






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





-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.ogf.org/pipermail/dfdl-wg/attachments/20111206/a9fb21e6/attachment-0001.html