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   Re: [xml-dev] XRules: Mind your own business rules

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On Thu, 10 Mar 2005, Waleed Abdulla wrote:

> And, what's the best way to propose something like this to W3C for their
> consideration? Or does it have to be submitted by a W3C member?

In case nobody has mentioned the W3C Workshop on Rule Languages for 
Interoperability -- you might want to check it out. Position papers
are due by March 18, 2005.

W3C Workshop on Rule Languages for Interoperability

"W3C Announces Workshop on Rule Languages for Interoperability"

- Robin Cover


> Hi everyone,
>     Thanks to XML and Web services, we're on the verge of an explosive
> growth in the amounts of data that our software applications exchange with
> each other. Some might argue that we're already drowning in it, but I think
> we've only seen the tip of the iceberg. 
>     With that it becomes more important to be able to exchange business
> rules between applications. So if I'm a service provider, I want to let my
> user's software agent know what my business rules are so it can provide a
> better experience to the user. For example, I want my user's software agent
> to know that I charge $7 for ground shipping and $20 for overnight if the
> order is under $50, and that ground shipping is free if the order is over
> $50. And, I want the user's software to be able to dynamically calculate the
> shipping cost locally as the user is editing the order. Basically, I want to
> be able to give my business rules to someone else's software and have it
> understand them (or, at least, behave as if it understands them).
>     I've done a lot of work in this area and I'm looking to find out if
> anyone is interested in participating in the ongoing design and development
> of this effort. It involves two components:
> 1. XRules, which is an XML rules language that expresses constraints,
> calculations, interdependencies, and properties that exist among nodes of an
> XML document. 
> 2. The Dynamic DOM, which is an extension of the DOM that dynamically
> executes and validates XRules rules. For example, you change the ItemPrice
> node and the ItemTotal node recalculates automatically. 
>     This is a fragment of a simple XRules document that shows how the total
> price per item is calculated in a purchase order, and highlights (through
> metadata properties) the items that exceed the allowed limit (a tutorial is
> available at www.xrules.org):
> <xr:ruleset context="/PurchaseOrder/Item">
>   <xr:calculate target="ItemTotal" value="UnitPrice * Quantity" />
>   <xr:bind target=".">
>     <xr:property name="OverLimit" dvalue="boolean(. &gt; ../MaxPerItem)" />
>   </xr:bind>    
> </xr:ruleset>
> And, this is a sample purchase order:
> <PurchaseOrder>
>   <MaxPerItem>300</MaxPerItem>
>   <Item>
>     <Quantity>2</Quantity>
>     <UnitPrice>30</UnitPrice>
>     <ItemTotal>60</ItemTotal>
>   </Item>
> </PurchaseOrder>
>     You can also download examples and tools from http://www.xrules.org.
>     So, if you're interested in the idea, or have suggestions or comments,
> I'd like to hear it. And, if you think this is the worst thing since
> chocolate bacon, then, well, I'd like to hear it too. 
>     And, what's the best way to propose something like this to W3C for their
> consideration? Or does it have to be submitted by a W3C member?
> Thanks,
> Waleed 
> http://www.xrules.org
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