RE: [xml-dev] RE: Proposal: a building block approach to XML design

["Toby Considine" <Toby.Considine@gmail.com>]

Are we talking set-up and occasional change, or are we talking message by
message?

The first is something that I have taken to calling a Configuration
Framework, and I see it as critical to scaling out the internet of things
and for BIM-Based Enterprise interactions with energy and operations. In my
case, I  am trying to formalize the small set of legal lego's  that would
allow a complex system tto initially announce/negotiate the types of
messages involved.

The second is often based on inheritance (including cross-schema
inheritance) and can be put together using tools such as CAM. On the other
hand, WS-I profiles strictly forbid generic inheritance. 

Both are interesting spaces, toward which one are you aiming *this*
conversation? 

tc


"If something is not worth doing, it`s not worth doing well" - Peter Drucker

Toby Considine
TC9, Inc
TC Chair: oBIX & WS-Calendar
TC Editor: EMIX, EnergyInterop
U.S. National Inst. of Standards and Tech. Smart Grid Architecture Committee

  
Email: Toby.Considine@gmail.com
Phone: (919)619-2104
http://www.tcnine.com/
blog: www.NewDaedalus.com



-----Original Message-----
From: Costello, Roger L. [mailto:costello@mitre.org] 
Sent: Thursday, July 19, 2012 5:35 AM
To: xml-dev@lists.xml.org
Subject: [xml-dev] RE: Proposal: a building block approach to XML design

Thanks David and Michael. Good comments.

Suppose I create building blocks as follows:

-- I place each building block into a separate schema file.

-- I assign each building block a different namespace.

So I have a bunch of building blocks, each in a different namespace.

Thus, requirement (1) has been met:

> (1) Need to identify an appropriate set of building blocks.

The Lego pattern also requires:

> (2) Need to specify the rules for assembling the building blocks.

NVDL [1] can be used for this.  NVDL is great for specifying how components
in different namespaces are to be assembled.

Here's the strategy: the user hands to the web service an NVDL document,
"Hey, here are my assembly instructions, please construct an XML document
that meets these assembly instructions."

But web services aren't good at this. 

Users can't give a web service a set of assembly instructions. 

Web services merely provide a menu of pre-assembled XML documents and the
user can only select from the menu. 

So how do we empower users of web services to "get what they want" and not
what the web service has already pre-assembled?

/Roger

[1] NVDL tutorial: http://www.xfront.com/nvdl/



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