[DFDL-WG] Action 282 (was Re: Fw: [DFDL]: First Release of DFDL4S Parser Library)

Tue Sep 22 12:21:00 EDT 2015

Dear Steve,

nice to hear things are moving.

The syntax below seems both reasonable and readable to me which is a good thing.

It addresses the belonging to decimal groups (integer only ??) I understand. (xs:decimal)

1) It might be also useful (not in our application but in general) to see if it makes sense also to define 
for dfdl:checkValues belongings to set of “enum” like value 

e.g. if we have a type for $val defined as (ON, OFF or STANDBY) or (MARRIED, SINGLE, WIDOWER)
can we also define a syntax that the $node belongs to it ?

2) for dfdl:checkRange it might make sense also to allow float numbers e.g.  X between 3.1 to 9.5

Michele

PS I will forward this proposal to our DFDL4S developers (in copy) to get their thinking.

> 
> From: "Steve Hanson" <smh at uk.ibm.com>
> Subject: [DFDL-WG] Action 282 (was Re: Fw: [DFDL]: First Release of DFDL4S Parser Library)
> Date: 22 Sep 2015 16:50:13 CEST
> To: DFDL-WG <dfdl-wg at ogf.org>
> 
> 
> To kick start this action, here is a proposal ... builds on the precedent provided by dfdl:checkConstraints($node).
> dfdl:checkValues($node, $val1, $val2, ...)	Returns boolean true if the specified node value matches any of the values provided by $val1 etc.
> The type of $val1 etc must be compatible with the type of $node.
> 
> It is a schema definition error if the $node argument is a complex element.
> 
> The number of value arguments is implementation-defined.
> 
> 
> dfdl:checkRangeInclusive($node, $val1, $val2)
> 
> Returns boolean true if the specified node value is in the range given by $val1 and $val2, inclusive.
> The type of $val1 and $val2 must be compatible with the type of $node, and must be a derivative of xs:decimal.
> 
> It is a schema definition error if the $node argument is a complex element.
> 
> 
> dfdl:checkRangeExclusive($node, $val1, $val2)
> 
> Returns boolean true if the specified node value is in the range given by $val1 and $val2, exclusive.
> The type of $val1 and $val2 must be compatible with the type of $node, and must be a derivative of xs:decimal.
> 
> It is a schema definition error if the $node argument is a complex element.
> 
> 
> 
> 
> Regards
>  
> Steve Hanson
> Architect, IBM DFDL <http://www.ibm.com/developerworks/library/se-dfdl/index.html>
> Co-Chair, OGF DFDL Working Group <http://www.ogf.org/dfdl/>
> IBM SWG, Hursley, UK
> smh at uk.ibm.com <mailto:smh at uk.ibm.com>
> tel:+44-1962-815848
> 
> 
> 
> From:        Steve Hanson/UK/IBM
> To:        DFDL-WG <dfdl-wg at ogf.org>
> Date:        11/08/2015 16:28
> Subject:        Fw: [DFDL]: First Release of DFDL4S Parser Library
> 
> 
> 
> 
> Regards
>  
> Steve Hanson
> Architect, IBM DFDL <http://www.ibm.com/developerworks/library/se-dfdl/index.html>
> Co-Chair, OGF DFDL Working Group <http://www.ogf.org/dfdl/>
> IBM SWG, Hursley, UK
> smh at uk.ibm.com <mailto:smh at uk.ibm.com>
> tel:+44-1962-815848
> ----- Forwarded by Steve Hanson/UK/IBM on 11/08/2015 16:27 -----
> 
> From:        Michele Zundo <michele.zundo at esa.int>
> To:        Mike Beckerle <mbeckerle.dfdl at gmail.com>
> Cc:        Steve Hanson/UK/IBM at IBMGB, Maurizio De Bartolomei <Maurizio.De.Bartolomei at esa.int>, Montserrat Piñol <mpinol at eopp.esa.int>, "Rui Mestre (DME)" <rui.mestre at deimos.com.pt>
> Date:        18/05/2015 08:47
> Subject:        Re: [DFDL]: First Release of DFDL4S Parser Library
> 
> 
> 
> Thanks Mike,
> 
> we will add this to our list to be considered/noted.
> 
> However reading your explanation (NB I’m NOT at all an XPath expert) it seemed you
> had some good reason for avoiding longer than 1 path, so I would like to avoid our DFDL4S
> project results in an over-complication of the DFDL implementation/use of Xpath 
> unless there are other reasons/users/rationale requiring this feature. 
> (btw the syntax is still weird-ish:  “intersect” reminds me of Venn Diagrams…)
> 
> As a project manager I always evaluate solutions and their cost vs the benefit they bring,
> and I believe the DFDL community should keep this is mind.
> 
> Michele
> 
> PS The syntax above anser to the question “belongs to” , would there be any way to express ranges of values then ?
> 
> 
> 
> On 15 May 2015, at 16:24 , Mike Beckerle <mbeckerle.dfdl at gmail.com <mailto:mbeckerle.dfdl at gmail.com>> wrote:
> 
> Just a few comments on DFDL4S, and also thank you to Michele and team for the presentation on Tuesday. 
> 
> I think all the issues in the spreadsheet are fairly easily fixed in that they are not major changes to DFDL4S, and would bring it into much closer compliance with the DFDL spec.
> 
> The exception is the XPath limitations where DFDL4S has gone beyond what XPath 2.0 allows and invented new syntax for expressing set membership requirements.
> 
> So I took a look, and XPath 2.0 has a set intersect operator:  ns1 intersect ns2 => ns3
> 
> This isn't in DFDL today, but might be usable to achieve the set membership test; however, it requires use of XPath node sequences of length greater than 1, which DFDL has avoided mostly. I say mostly as there are XPath expressions that return node sequences of length greater than 1 and those can be arguments to fn:count(...) for example.
> 
> So far in DFDL such node sequences cannot "leak out" of the XPath expression into DFDL elements, and I think the usage in DFDL4S is similar in that these node sequences would be needed only to check for set membership, so the result is just a boolean as part of an assert/discriminator.
> 
> We should examine whether XPath 2.0 set intersection is enough to meet the need. 
> 
> I believe the expressions would be something like:
> 
>      fn:exists( . intersect (123, 456, 789, .... many more items....) )
> 
> 
> - mike beckerle
> 
> 
> Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com <http://www.tresys.com/>
> Please note: Contributions to the DFDL Workgroup's email discussions are subject to the OGF Intellectual Property Policy <http://www.ogf.org/About/abt_policies.php>
> 
> 
> On Tue, May 12, 2015 at 10:45 AM, Michele Zundo <michele.zundo at esa.int <mailto:michele.zundo at esa.int>> wrote:
> for reference, 
> here a summary of the reported problem in an excel sheet.
> 
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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 <mailto:michele.zundo at esa.int>
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> -----------------------------------------
> Michele Zundo
> 
> Head of Ground System Definition and Verification Office
> EOP-PEP
> European Space Agency, ESTEC
> e-mail: michele.zundo at esa.int <mailto: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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