[Zope3-dev] "Sub interface"

[Jim Fulton]

Stephan Richter wrote:
> On Sunday 29 February 2004 00:27, Terry Hancock wrote:
> 
>>A sub-interface inherits from Interface.Attribute, but
>>has an extra property specifying the expected interface
>>of the attribute.
> 
> 
> For this we have fields. I just checked and you cannot specify the interface 
> of a field,

Yes you can:

import zope.interface
import zope.schema


class IFoo(zope.interface.Interface)

   myattr = zope.schema.Object(schema=IBar)


This schema field type was added in the Winter 2003 OzZope
sprint.  It is undortunate that the keyword argument name
is scheme. This should be changed to interface, or perhaps type.

Jim


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