I wonder how many users are actually eager to learn more than one schema 
language, and willing to do so for the benefits one language has over 
another.

I'm guessing this requires a level of sophistication more common on this 
list (yes, I use multiple schema languages) than in the world as a 
whole. This doesn't feel like something heading toward mainstream.

Jonathan

Costello, Roger L. wrote:
> Hi Folks,
>
> Here are the evolutionary (disruptive) changes I envision NVDL bringing
> about in the marketplace:
>
>
> 1. Opens the marketplace to utilizing a variety of schema languages.  
>
> Previously, you and all your trading partners were locked into using
> one schema language (typically W3C XML Schema) if you wanted
> interoperability.  With NVDL that limitation is lifted and you can
> achieve interoperability while using a variety of schema languages.
>
>
> 2. Promotes using the right schema language for the right job. 
>
> XML Schema and Relax NG are two schema languages for expressing
> grammar-based rules. They are both standards, the former a W3C
> standard, the later an ISO standard.  Although their capabilities are
> largely overlapping, there are important differences.  "Use the right
> tool for the right job" is an adage that applies to choosing a schema
> language. Knowing the differences in capabilities is important to
> making a good decision in choosing a schema language. 
>
>
> 3. Encourages the creation of small, simple, independent schemas,
> written in any schema language.  
>
> Rick Jelliffe captures this nicely in his article "Standardize The
> Jellybeans Not The Jars"
> http://www.oreillynet.com/xml/blog/2007/11/standardize_the_jellybeans_n
> ot.html
>
>
> 4. Moves the application developer's focus from: 
>
>        "using a schema" 
>  
>    to:  
>
>        "using XML vocabularies"
>
>
> Can you think of other changes that NVDL may bring about in the
> marketplace?
>
>
> /Roger
>
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