Re: FpML-VAL Syntax

[matthew.d.rawlings@xxxxxxxxxxxx]

Today there is no convention or guidance
on how to express conditions to FpML Validation Rules. The VWG should
recommend a way to express a condition, so that the product WGs can express
conditions on the firing of a rule.

The example sent by Marc uses the XPath
way of expressing conditions, by placing the condition in square braces.
Multiple conditions are expressed by a sequence of conditions. The XPath
way of expressing conditions is well defined and widespread. I prefer to
use XPath for these simple conditions rather than invent our own syntax.
XPath is suitable because it is precise, but not formal.

Matthew Rawlings 
+44 7917 596 827

"Marc Gratacos" <MGratacos@xxxxxxxx>
Sent by: valwg@xxxxxxxx

16/05/2008 14:51

Please respond to
valwg@xxxxxxxx

To	<valwg@xxxxxxxx>
cc	<andrew.p.parry@xxxxxxxxxxxx>
Subject	FpML-VAL Syntax

All,
 
A number of suggested improvements to the
current validation rules introduce a different approach from how the rules
are currenty defined. As example, the way contexts are stated in this new
approach is much more precise containing evaluations and closer to a formal
implementation but it moves away from the current simple pseudo-english
expressions.
 
Example of proposed solution (http://www.fpml.org/issues/view.php?id=686):
Context: BrokerEquityOption (complex
type)[fn:exists(numberOfOptions)][exists(equityPremium/paymentAmount)][exists(equityPremium/pricePerOption)][val:same-currency((equityPremium/paymentAmount,equityPremium/pricePerOption))]
eqd-25 (Mandatory)
equityPremium/pricePerOption/amount * numberOfOptions eq equityPremium/paymentAmount/amount.
Comment: This is equivalent to eqd-20, but for brokerEquityOption, where
there is no optionEntitlement. 
I'd like to ask the group how we should express
rules going forward.
 
Kind Regards,
Marc  
 
 
 
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