[DFDL-WG] DFDL4S use of wildcard/regex in length path expression

[Steve Hanson]

Hi Michele

I don't believe the DFDL-WG ever received a reply to the questions below ?

Regards
 
Steve Hanson
IBM Integration Bus, Hursley, UK
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
smh at uk.ibm.com
tel:+44-1962-815848
mob:+44-7717-378890



From:   Mike Beckerle <mbeckerle.dfdl at gmail.com>
To:     Michele Zundo <michele.zundo at esa.int>, Steve Hanson/UK/IBM at IBMGB, 
"dfdl-wg at ogf.org" <dfdl-wg at ogf.org>
Cc:     "Rui Mestre (DME)" <rui.mestre at deimos.com.pt>
Date:   28/07/2016 16:30
Subject:        DFDL4S use of wildcard/regex in length path expression


(I edited the subject line for this discussion.)

Michele,

Could you send the parts of the DFDL4S schema that use the types that have 
these wildcard/regex in them?

Also, please send as a zip file, not a jar. Google, in its infinite 
wisdom, has decided that it is better to save me from a potential computer 
virus than to let me get my work done, and they block all access to 
attachments that are jar files, you can't rename them, save to Drive, save 
to local file system, nor forward them to a different email account. 

I want to see exactly what this wildcard is doing for you. I suspect it is 
just allowing these types to be reused in contexts where otherwise you'd 
have to have separate 
complex type definitions just because this one step of the path is 
different at the different points of re-use.

I want to really think about whether there is some other way to achieve 
this same reusability, or if not, just how bad is the workaround.

...mike beckerle






From: Steve Hanson [smh at uk.ibm.com]
Sent: Tuesday, July 26, 2016 3:20 AM
To: Michele Zundo
Cc: Mike Beckerle; rui.mestre at deimos.com.pt
Subject: Re: Fwd: OGF DFDL WG Call Minutes 2016-07-05

Michele, Rui 

I assume that this is an example ? 

dfdl:length="{/Packet_Primary_Header/Packet_Data_Length + 1 - 
                   contentLength(
/Packet_Data_Field/(.*)Packet_Secondary_Header, 'bytes') - 2}"

Firstly, contentLength is a DFDL function so it needs to be in the DFDL 
namespace, eg, dfdl:contentLength(). 

Secondly, the first argument to dfdl:contentLength() is a path, so you are 
effectively still using regular expressions in path steps. 

Regards
 
Steve Hanson
IBM Integration Bus, Hursley, UK
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
smh at uk.ibm.com
tel:+44-1962-815848
mob:+44-7717-378890 



From:        Michele Zundo <michele.zundo at esa.int> 
To:        Steve Hanson/UK/IBM at IBMGB 
Cc:        Mike Beckerle <mbeckerle at tresys.com> 
Date:        25/07/2016 17:10 
Subject:        Fwd: OGF DFDL WG Call Minutes 2016-07-05 




Dear Steve, 

Please find below the answer from our developers and example. 

Note that we have updated our implementation of DFDL to be as compliant as 
we 
can at this point in time with the exception noted below. 

Michele 

Begin forwarded message: 

From: "Rui Mestre (DME)" <rui.mestre at deimos.com.pt> 
Subject: Re: Fwd: OGF DFDL WG Call Minutes 2016-07-05 
Date: 25 July 2016 at 17:45:05 GMT+2 

Dear Michele,

 I believe that after our DFDL compliance effort the mentioned "use of a 
regex in the path step of a DFDL expression" is no longer in place. 

 Currently the only extension implemented in DFDL4S regarding the use of 
regular expressions is that implementation of dfdl:contentLength is 
extended to support also regular expressions when specifying the node.

 Please find attached a schema file example containing such extension in 
the use of dfdl:contentLength.

Best regards,
Rui


Begin forwarded message: 

From: Steve Hanson <smh at uk.ibm.com> 
Subject: OGF DFDL WG Call Minutes 2016-07-05 
Date: 5 July 2016 at 17:49:13 GMT+2 
To: dfdl-wg at ogf.org 
Cc: "Mike Beckerle" <mbeckerle at tresys.com>, "Michele Zundo" <
michele.zundo at esa.int> 

Please find minutes from the above call at 
https://redmine.ogf.org/dmsf_files/13537?download= 

@Michele - please can you send to the WG a schema that shows your use of a 
regex in the path step of a DFDL expression ? 

Next call Aug 2nd 

Regards

Steve Hanson
Architect, IBM DFDL,
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848 

----------------------------------------- 
Michele Zundo 

Head of Ground System Definition and Verification Office 
EOP-PEP  
European Space Agency, ESTEC 
e-mail: michele.zundo at esa.int 


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Michele Zundo 

Head of Ground System Definition and Verification Office 
EOP-PEP 
European Space Agency, ESTEC 
e-mail: michele.zundo at esa.int 










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