Geoff Judd/UK/IBM
05/10/2005 17:44 To
Steve Hanson/UK/IBM at IBMGB
cc
Mike Beckerle/Worcester/IBM at IBMUS,
Suman Kalia/Toronto/IBM at IBMCA
Subject
Re: Fw: [dfdl-wg] F2F status on
discussions here about Scoping #2
(Document link: Steve Hanson)
Steve,
This is how I would see the definitions with selectors.
Regards,
Geoff Judd
Websphere MQ Integrator Development
IBM UK Ltd
Hursley
Telephone: +44-1962-818461
E-mail: JUDDG at uk.ibm.com
Steve
Hanson/UK/IBM
To
05/10/2005 12:30 Mike Beckerle/Worcester/IBM
cc
Geoff Judd/UK/IBM, Suman
Kalia/Toronto/IBM at IBMCA
Subject
Fw: [dfdl-wg] F2F status on
discussions here about Scoping #2
I think I see what selectors solve. It's the embedded message scenario
where I have a different format, and hence configuration, for the embedded
message. I can use selectors to pull together multiple different
configurations in a single parse. Correct?
Regards, Steve
Steve Hanson
WebSphere Business Integration Brokers,
IBM Hursley, England
Internet: smh at uk.ibm.com
Phone (+44)/(0) 1962-815848
----- Forwarded by Steve Hanson/UK/IBM on 05/10/2005 12:27 -----
Steve
Hanson/UK/IBM
To
05/10/2005 12:18 Mike Beckerle <beckerle at us.ibm.com>
cc
Geoff Judd/UK/IBM, Suman
Kalia/Toronto/IBM at IBMCA
Subject
Re: [dfdl-wg] F2F status on
discussions here about Scoping
(Document link: Steve Hanson)
Hi, I've taken a look through the slides, looks like you had a productive
day. The scheme looks ok in principle, but I can't glean from the foils
exactly how the selector mechanism works, and (consequently) why we can't
achieve the same result using configuration blocks alone. I'm not trying to
be awkward here, just trying to justify to myself why we need the extra
complexity selectors introduce. It would be great if we could rubber stamp
scoping by the end of the call today.
What would be really helpful for the call would be to mail out a single
DFDL schema that used configurations and selectors to model the following
COBOL message and its equivalent tagged/delimited form. As a comparison,
here's a DFDL schema that models this just using configurations. This works
because the extends attribute is mandatory on any dfdl element if more than
one configuration is defined.
1 MESSAGE
5 STR-FIELD PIC X(10)
<----------- logical string length 10
5 INT-FIELD PIC 9(8) COMP
<----------- logical integer, physical integer length 4
5 DEC-FIELD PIC 9999V99 DISPLAY
<----------- logical decimal, physical extended decimal length 6 with VDP 2
Tagged/delimited example instance using postfix delimiters
<MSG><STR>Example;<INT>4000;<DEC>9999.99;<END>
<dfdl:configuration name="cobol-params" repType="binary" ...... />
<dfdl:configuration name="tagged-params" repType="text" ...... />
<xsd:element name="message">
<xsd:annotation>
<xsd:appinfo source="http://dataformat.org">
<dfdl:defaults>
<dfdl:configuration selector="cobol"
extends="cobol-params" charset="937" byteOrder="bigEndian" />
<dfdl:configuration selector="tagged"
extends="tagged-params" charset="850" />
<dfdl:defaults>
</xsd:appinfo>
</xsd:annotation>
<xsd:complexType>
<xsd:sequence>
<xsd:annotation>
<xsd:appinfo source="http://dataformat.org">
<dfdl:sequence selector="tagged"
initiator="<MSG>" terminator="<END>" separator=";" separatorType="postfix"
/>
</xsd:appinfo">
</xsd:annotation>
<xsd:element name="str_field" xsd:type="string">
<xsd:annotation>
<xsd:appinfo source="http://dataformat.org">
<dfdl:string selector="cobol"
baseWidth="10" />
<dfdl:string selector="tagged"
initiator="<STR>" />
</xsd:appinfo>
</xsd:annotation>
</xsd:element>
<xsd:element name="int_field" xsd:type="int">
<xsd:annotation>
<xsd:appinfo source="http://dataformat.org">
<dfdl:int selector="cobol"
baseWidth="4" />
<dfdl:int selector="tagged"
initiator="<INT>" />
</xsd:appinfo>
</xsd:annotation>
</xsd:element>
<xsd:element name="string" xsd:type="decimal">
<xsd:annotation>
<xsd:appinfo source="http://dataformat.org">
<dfdl:decimal selector="cobol"
baseWidth="6" virtualDecimalPoint="2" />
<dfdl:decimal selector="tagged"
initiator="<DEC>" virtualDecimalPoint="2" />
</xsd:appinfo>
</xsd:annotation>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
Regards, Steve
Steve Hanson
WebSphere Business Integration Brokers,
IBM Hursley, England
Internet: smh at uk.ibm.com
Phone (+44)/(0) 1962-815848
Mike Beckerle
<beckerle at us.ibm.
com> To
Sent by: dfdl-wg at gridforum.org
owner-dfdl-wg at ggf cc
.org
Subject
[dfdl-wg] F2F status on discussions
05/10/2005 03:08 here about Scoping
Attached are slides we'll review as a group tomorrow. Could be typos in
these. I did them rather fast.
[attachment "ggf15-dfdl-wg-f2f-scoping-summary.ppt" deleted by Geoff
Judd/UK/IBM]