FpML-FXWG-Legacy Fwd: FW: [fpml-fx] New Base Rate Element and Multiple Inheritance

["Danielle Cauthen" <dcauthen@xxxxxxxx>]

--- In fpml-fx@xxxxxxxxxxxxxxx, Rick Schumacher 
<rick.schumacher@...> wrote:

Justin,
 
Guess that means we should change the DTD and add the new 
intermediate
element (quotedCurrencyPair).  Can you make the change or would you 
like me
to do it?
 
Let me know.
 
Rick
 
 
-----Original Message-----
From: Micelli, Ned [mailto:Ned.Micelli@...]
Sent: Sunday, January 06, 2002 1:26 PM
To: fpml-fx@xxxxxxxxxxxxxxx; 'fpml-architecture@xxxxxxxxxxxxxxx'
Subject: [fpml-fx] New Base Rate Element and Multiple Inheritance


Justin,

I left you a voice mail regarding the subject topic on Friday 1/04, 
I hope
you received it.

I have discussed the subject matter with the architecture working 
group on
Friday 
and in short the issue Andrew Jacobs raised is basically a result of 
the
fact that 
XML schemas do NOT support multiple inheritance.

So, as you suspected the proposed base rate element would only work 
if we
created 
a new element for the three fields (e.g. CCY1, CCY2 and quote 
basis.) This
new 
element I believe you called it "QuotedCurrencyPair" would then be 
included
in 
each of the higher level elements that use it (e.g. exchangeRate, 
fixing,
fxBarrier, fxDigitalOption, fxAmericanTrigger, fxEuropeanTrigger).

The disadvantage to the above suggestion is that the creation of a 
new
element 
would cause the three fields to be "nested" within the higher level 
element 
"QuotedCurrencyPair".

Even though the nesting is required I think the change is still 
worth doing.
Basically,
any time a group of fields/nodes are repetitively "reused" grouping 
them
into a single
element allows for some level of objectivity and more importantly
consistency.

---- General Discussion -----

As you probably know, multiple inheritance in general usually sparks 
a great
deal
of debate in the OO world. I think it is safe to say, almost 
independent of
the 
schema issue, we would want to avoid it's use anyway.

General rule of thumb, a quick test for inheritance verses 
aggregation.

Usually,
Inheritance represents a "IS_A" relationship. 

Whereas,
Aggregation represents a "HAS_A" relationship.

(see attached diagrams)

---- Additional Comments ----

In reviewing FpML in general one could question the current 
the "single" 
inheritance relationships which are used throughout the current FpML 
DTDs. I
believe 
the majority of them would fail the above tests.  This was raised by 
the
architecture 
team however it is my understanding that the FpML committee thought 
it was
more important
to model the "business" as closely as possible rather than 
attempting to
implement
a "pure" OO DTD.

I have attached a some diagrams from the FpML architecture 
specification
which 
illustrate the relationships I a have discussed above. 

I hope this helps thanks and regards,

Ned J. Micelli
Sr. Development Analyst 
Reuters Business Technology Group      

   






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