EntityRoleWhiteList metadata filter

[Rod Widdowson]

> That would seem to imply that no entities are retained. Is that the
> correct interpretation?

AFAICS in the code yes.  That would be logical.  
 
> Suppose the filter required at least one <RetainedRole> child element
> instead. Not only is that more clear but in that case attribute
> removeRolelessEntityDescriptors becomes unnecessary since entities
> with no roles would positively not be retained.

I seem to remember (going back maybe 5 or 10 years) that there is religion involved with "one or more" as opposed to "zero or more"
in XML (to do with the specifications, xslt processing and some such).  

Possibly that it’s a bear to have to enforce "one or more" when auto generating XML.

I'm hoping that Ian or Scott will remember the precise details

Rod