[This message was posted by Witold Sames of Portware <w.sa...@gmail.com> to the
"Algorithmic Trading" discussion forum at http://fixprotocol.org/discuss/31.
You can reply to it on-line at http://fixprotocol.org/discuss/read/27d2ad5e -
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Sergey,
I am not sure about the validation expression with respect to the exclusive OR.
From what I remember from school, XOR expressions return true if exactly one of
two related expressions returns true (but never when both are true or both are
false).
I believe it may not even be necessary if your ATDL file had specified the
related strategy parameter in a different manner, like the following example:
<parameter
xsi:type="String_t"
uiRep="Premium - Discount"
use="optional"
name="PorD"
type="14"
fixTag="9999">
<enumPair uiRep="Absolute Premium" wireValue="Abs"></enumPair>
<enumPair uiRep="Pct Premium" wireValue="PctPremium"></enumPair>
<enumPair uiRep="Pct Discount" wireValue="PctDiscount"></enumPair>
</parameter>
That way, the user has no choice but to pick one of the choices. Validation can
then be performed based on some other parameter, like disabling this drop down
if no "price" has been entered, or making mandatory, etc.
--ws
> .. with 2 or more operands.
>
> XOR is interpreted as "Odd" function. It is "True" IIF odd number of
> operands are true. Is that correct for ATDL?
>
> This is why I am asking, I received an ATDL file with a definition
> like this:
>
> <val:StrategyEdit errorMessage="Please specify one type of Premium or
> Discount"> <val:Edit logicOperator="XOR"> <val:Edit field="AbsPremium"
> operator="EX"/> <val:Edit field="PctPremium" operator="EX"/> <val:Edit
> field="PctDiscount" operator="EX"/> </val:Edit> </val:StrategyEdit>
>
> How would you interpret this? Using "Odd" XOR definition the validation
> is passed when all 3 are set.
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