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I'm currently involved in the selection of standard fields for a metadata project and we have some fields that we are calling Dublin Core fields (Subject and Relation fields), but we are including free text or uncontrolled terms. I notice that the DC Subject and Relation fields are "intended to be used with a non-literal value." I'm not sure what this means. Is there anyone that can explain in simple terms? I've looked at the DCMI Abstract Model and I'm still not sure what they mean by "non-literal" value. Also, can you say you are using Qualified Dublin Core for some fields and Simple Dublin Core for other fields in an application profile?