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

[Mike Beckerle]

(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*
<http://www-03.ibm.com/software/products/en/ibm-integration-bus>, Hursley,
UK
Architect, *IBM DFDL*
<http://www.ibm.com/developerworks/library/se-dfdl/index.html>
Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
*smh at uk.ibm.com* <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*
<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>*smh at uk.ibm.com* <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>*dfdl-wg at ogf.org* <dfdl-wg at ogf.org>
*Cc: *"Mike Beckerle" < <mbeckerle at tresys.com>*mbeckerle at tresys.com*
<mbeckerle at tresys.com>>, "Michele Zundo" <*michele.zundo at esa.int*
<michele.zundo at esa.int>>

Please find minutes from the above call at
<https://redmine.ogf.org/dmsf_files/13537?download=>
*https://redmine.ogf.org/dmsf_files/13537?download=*
<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* <http://www.ogf.org/dfdl/>
IBM SWG, Hursley, UK
*smh at uk.ibm.com* <smh at uk.ibm.com>
*tel:+44-1962-815848* <+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>*michele.zundo at esa.int*
<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* <michele.zundo at esa.int>










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