[Os-project-managers] NaN in xs:double (OSrL)

[Horand Gassmann]

Hi guys,

as we saw a couple of days ago, NaN is a legal value for initial  
variable values. What about returning NaN from the solver? I don`t  
think I can currently say

<solution ...>
	<variables ...>
		<values numberOfVar="2">
			<var idx="0">NaN</var>
			<var idx="1"/>
		</values>
...

Both of the <var> lines will give an error, and I am a bit uneasy  
about interpreting the second one as NaN. But it seems useful to me to  
have a solver return NaN in case there are problems (such as taking  
the square root of a negative number). Any ideas? Do we need to expand  
the definition of xs:double?

Cheers

gus