XML.orgXML.org
FOCUS AREAS |XML-DEV |XML.org DAILY NEWSLINK |REGISTRY |RESOURCES |ABOUT
OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.

 


Help: OASIS Mailing Lists Help | MarkMail Help

[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index]
RE: [xml-dev] RNG vs. XSD : is the use of abstract types andpolymorphism a good or bad thing for schemas for XML?

Very interesting.  This also more clearly explains why RNG does not provide "type" like XSD does.
It provides validation but not typing.

I don't agree with the premise, however, that representing inheritance (or type) is irrelevant to the conceptual model. 
What if the conceptual model is in fact inheritance as opposed to a mechanism of representing a conceptual model.
It may be irrelevant to some classes of conceptual models ... 

----------------------------------------
David A. Lee
dlee@calldei.com
http://www.xmlsh.org

> -----Original Message-----
> From: Costello, Roger L. [mailto:costello@mitre.org]
> Sent: Monday, March 12, 2012 1:04 PM
> To: xml-dev@lists.xml.org
> Subject: RE: [xml-dev] RNG vs. XSD : is the use of abstract types and
> polymorphism a good or bad thing for schemas for XML?
> 
> John Cowan wrote:
> 
> > See http://www.thaiopensource.com/relaxng/design.html#section:15
> > for James's thinking on inheritance in schema languages.
> 
> Fascinating!
> 
> Here are a few excepts from the article:
> 
>     One of the most significant differences between RELAX NG and
>     W3C XML Schema is that RELAX NG does not have any concept
>     of inheritance.
> 
>     Inheritance has proven to be very useful in modeling languages
>     such as UML. However, I would argue that trying to make an XML
>     schema language also be a modeling language is not a good idea.
>     An XML schema language has to be concerned with syntactic details,
>     such as whether to use elements or attributes, which are irrelevant
>     to the conceptual model.
> 
>     ... there is no need for it to support inheritance; the role of the schema
>     language is purely to describe the XML syntax used to represent the
>     conceptual model.
> 
>     ... the role of the schema language is purely to describe the XML syntax
>     used to represent the conceptual model. RELAX NG has the advantage in
>     this role that it provides more flexibility in the choice of syntax.
> 
> /Roger
> 
> 
> ___________________________________________________________________
> ____
> 
> XML-DEV is a publicly archived, unmoderated list hosted by OASIS
> to support XML implementation and development. To minimize
> spam in the archives, you must subscribe before posting.
> 
> [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/
> Or unsubscribe: xml-dev-unsubscribe@lists.xml.org
> subscribe: xml-dev-subscribe@lists.xml.org
> List archive: http://lists.xml.org/archives/xml-dev/
> List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
> 




[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index]


News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 1993-2007 XML.org. This site is hosted by OASIS