[Zope] connectionIsValid

[Daniel G. Rusch]

The following works just peachy:

<dtml-if "Database.connected()">
Yes
<dtml-else>
No
</dtml-if>

Why doesn't this work?

<dtml-if "Database.connectionIsValid()">
Yes
<dtml-else>
No
</dtml-if> 

What is the syntax of connectionIsValid; am I doing something incorrect?

Thanks,

DR