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[protege-discussion] Programmatically override the maximum cardinality for a slot, varying it by Cls

Jonathan Carter jonathan.carter at
Tue Oct 26 04:45:22 PDT 2010

Hi Ron,

I've been doing something similar recently with the Java API to programmatically apply updates to the Class and Slot hierarchy.

I believe that all you need to do is use the method:

 setTemplateSlotMaximumCardinality(Slot slot, int max)

On the Cls class.


articleCls = kb.getCls("Article");
keywordSlot = kb.getSlot("keyword");
articleCls.setTemplateSlotMaximumCardinality(keywordSlot, 5);

This is equivalent to editing the slot at the class rather than the top-level in the Protege GUI - which I believe is what you're looking for.
Hope this helps


Jonathan Carter 
Enterprise Architecture Solutions Ltd

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On 25 Oct 2010, at 03:28, Ron Schultz wrote:

> I have a circumstance where different Clses contain the slot 'keyword.' The keyword slot is of valueType 'String,' with a default maximum cardinality set to 1.
> I have a requirement to vary this cardinality class by class. I am just not sure how to do this programmatically.
> Let's say I have a class 'Article' where I want to set the maximum number of keywords to 5.
> Do I:
> Get the slot 'keywords' from the cls 'Article', and then set the values of keyword's slot named :SLOT-MAXIMUM-CARDINALITY to a Collection containing 5?
> Or do I perform some operations using the facets of the slot 'keyword.'
> Or ...?
> I've spent all weekend trying to figure this out and I know I must be missing something obvious.
> Thanks.
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