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It’s a little confusing that ZCML registrations for Zope utilities can accept a component or a factory.
<utility component=".some.Class" />
versus
<utility factory=".some.Factory" />
What is the difference?
A factory creates utilities, while a utility registered as a component is an instance. Hence, if you look up a utility registered as a component, you will get the same object back every time. But if it’s registered as a factory, you’ll get a new instance every time.