| XML list files in an element-centric structure (was: small issues on "register" and "tLineInfrastructureManagerCode") [message #1137] |
Thu, 06 December 2012 10:53  |
Susanne Wunsch railML
Messages: 0
Registered: January 2020
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Dear Dirk and others,
I want to discuss the general structure of separate XML files as
replacement for schema-internal enumeration lists in this 'misc' forum
because it concerns all sub-schemas.
Susanne Wunsch <coord(at)commonrailmlorg> writes:
> Dirk Bräuer <dirkbraeuer(at)irfpde> writes:
>>> concerning the file structure: I would prefer using named attributes
>> rather than default attributes with element names for shortness
>> (<version code='ENEE'> rather than <code>ENEE</code>).
>
> Yes, that is a break in the current railML encoding style.
>
> We often stumble over attributes that would need to occur more than
> once. That's obviously not possible with XML. We need to convert them to
> elements so far. That is a "structure-braking-change". In contrast
> changing the elements multiplicity from "1" to "unbounded" is a small
> change.
>
> That's the reason for changing the style concept starting with these new
> "separate XML file" additions.
I would like to introduce this new style with the separate XML
files. There are good reasons for attribute-centric and good reasons for
element-centric schemas. These discussions were held in dozens of
newsgroups, mailing lists and web-forums for various domains. It's not a
railway-specific issue. It's a general XML-style issue. Therefore I
would adopt the recommendations of these two conclusions of well-known
XML experts. [1] [2]
What would change for the railML style?
* Promote all attributes to elements, despite of the following
@id, @code, @xml:lang
That change is currently only proposed to the XML list files. The railML
schema files keep unchanged.
Any comments, questions, concerns, +1, -1 ... appreciated.
Kind regards...
Susanne
[1] http://www.ibm.com/developerworks/xml/library/x-eleatt/index .html
[2] http://recycledknowledge.blogspot.de/2008/03/elements-or-att ributes.html
Crosspost & Followup-To: railML.misc
--
Susanne Wunsch
Schema Coordinator: railML.common
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