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   Re: [xml-dev] NVDL as a dispatching architecture

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  • To: "MURATA Makoto \(FAMILY Given\)" <eb2m-mrt@asahi-net.or.jp>, xml-dev@lists.xml.org
  • Subject: Re: [xml-dev] NVDL as a dispatching architecture
  • From: Tatu Saloranta <cowtowncoder@yahoo.com>
  • Date: Mon, 8 May 2006 17:19:51 -0700 (PDT)
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--- "MURATA Makoto (FAMILY Given)"
<eb2m-mrt@asahi-net.or.jp> wrote:

> However, the NVDL specification is silent about such
> application
> frameworks.  I believe that we need much more
> experiences with NVDL
> first.  Also, I am not sure that standardization is
> the right approach
> for designing such application frameworks.  (E.g., 
> SAX, DOM, and even
> STAX may be used for constructing them.)
> I am hoping that early adaptors of NVDL accumulate
> board experiences 
> and make a hundred flowers blossom.

This seems reasonable.

It is interesting to read about NVDL, since
(for what it's worth) I have written a simple
validation framework that builds on StAX. This was
done as part of experimental Stax^2 set of extensions
on basic stax api, and allows for multiple validators
on individual input (parsing) and output
(serialization streams), including possibility to
start/stop individual validators mid-stream. I have
not added any support for inter-validator co-operation
at this point, although that would be a possibility
(within limitations of the streaming model).
Currently validators exist for basic DTD (provided
natively by the stax impl), and RNG (using MSV);
adding one for w3c schema is planned (using MSV as

This approach is obviously less generic than NVDL, but
seems reasonable for efficient validation within
context of stax (pull) processing.

-+ Tatu +-

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