Thread:Semantic-mediawiki.org:Community portal/Form Driven Knowledge Base/reply

You can't store different contacts (or more generally, entities) with the same name. If you have two different contacts named "John Smith" (I assume that's the kind of thing you're asking about), you'll have to use some kind of disambiguation scheme - like including the middle name, or company name, or something. If you're creating contact pages via a form, you could do it by using the "one-step process" and including "unique ID" in the page name formula.