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Re: COLAG Version 2.0

  • To: Rahul Jain <rahul@c...>
  • Subject: Re: COLAG Version 2.0
  • From: "Chiusano Joseph" <chiusano_joseph@b...>
  • Date: Mon, 03 Mar 2003 08:59:20 -0500
  • Cc: xml-dev@l...
  • Organization: BAH
  • References: <5.1.1.6.0.20030220205008.00ae5330@c...>

colag
From your site:

<Quote1>
As an example, consider the software agent that calculates the discount
applicable on a product. Currently, to create such agent, we have to
know and fix the categories of applicable discounts and their formula at
design time and code them explicitly in the software. 
</Quote1>

Only poor system designers have to do this.  As you no doubt know, one
classic way of handling this is to store the cateogories of applicable
discounts and their formulas in relational database tables that are
maintained "outside" of the code, and accessed at run-time for the
latest information.

Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton

Rahul Jain wrote:
> 
> Hi,
> I invite your feedback on second version of COLAG. This includes major
> changes and there is a new document containing examples, illustrating all
> aspects of the technology.
> 
> COLAG (Conversation Oriented Learning And Growing software) is an XML based
> environment for writing software with the unique feature that the execution
> logic (behavior) of the running COLAG program can be dynamically changed at
> runtime using XML based messages without any need for re-compilation. COLAG
> software is a collection of XML documents, where each document (called
> 'specification file') specifies the data and behavior of an entity (class
> in OOLanguage). An entity instance (similar to 'object') is represented by
> an XML element called its 'instance element', and its data is represented
> by an XML tree called 'instance tree'. COLAG introduces a new concept of
> 'global data tree', which refers to a run-time XML tree that will contain
> the instance trees of the instances created at run-time, i.e. instance
> element of an instance will be added to the global tree after its creation.
> The equivalent of a method in  COLAG is called a 'conversation', but unlike
> method, a conversation is capable of 'self-instantiation'. A conversation
> will specify via XPath expression, the nodes in the global tree whose
> update will instantiate it. A conversation will execute by constructing an
> XML tree, called its 'conversation tree', and update the global tree by
> transferring the content from the conversation tree to the global tree,
> which might start other conversations and so on. COLAG  also defines
> concept of a 'message conversation, which will start in response to receipt
> of an appropriate external message, as given by its start condition. An XML
> based message format is also defined in COLAG that can be used to interact
> with instances in a running COLAG program by instantiating their message
> conversations. This can also be used to dynamically introduce new
> conversations or modify/delete existing conversations of the instances,
> there by changing the program logic.
> 
> Please refer to the Primer document at colag.com for complete description
> of the technology. Any comments are welcome.
> Thanks,
> Rahul Jain
> 
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