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Re: XML Schema complex type restriction

  • From: Hans-Juergen Rennau <hrennau@yahoo.de>
  • To: Rick Jelliffe <rjelliffe@allette.com.au>, Mukul Gandhi <gandhi.mukul@g...>
  • Date: Mon, 25 Sep 2017 12:47:59 +0000 (UTC)

Re:  XML Schema complex type restriction
"The trouble with restriction is not knowing exactly what the differences are or why."

This is an interesting point. (And I've always avoided restriction of complex types, instinctively.)

Of course it would, in principle, be very easy to specify a restriction step explicitly, using a tiny vocabulary for specifying the removal of optional elements, other cardinality changes and whatever else is needed. Such a "restriction descriptor" might be the input (together with the original schema) for generating the restricted schema, as well as a new from-scratch schema expressing the restrictions. I wonder if there are any proven approaches to this which might be considered good practise? (And how does NIEM treat this question, where restriction of extreme generality should be extremely important?)

With kind regards,
Hans-J├╝rgen


Rick Jelliffe <rjelliffe@allette.com.au> schrieb am 10:01 Montag, 25.September 2017:


You are forced to use a started kitchen sink schema because is standard and therefore will make life easier.

However, most of the elements and attributes are things you dont need. And you know the full schema will blow out implementatuon and confuse testing and anyway YAGNI. 

So you will make profile (Subset) of it using restriction and distribute that. 

But then your schema documents may be bloated. It may be simple just have a parallel validation which just check that only wanted element names are used, using any schema language. 

I.e. In allow elements a,b,c,d,e,f,g,... only chill elements a,b,c,d,e,f,g,... can be used. So the big schema states all the rules. The small one excludes unwanted canes, making it really expect. The trouble with restriction is not knowing exactly what the differences are or why.
Rick




Regards
Rick


On 25 Sep 2017 5:27 PM, "Mukul Gandhi" <gandhi.mukul@g...> wrote:
Hello list,
    Can anyone come up with a useful business use case, to use XML Schema complex type restriction?


--
Regards,
Mukul Gandhi




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