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Unique, persistent identifiers for vocabulary term concepts are critical for metadata (DC1, SKOS, etc). This comes as no surprise to followers of Linked Data3, for whom this first principle of the semantic web is a sine qua non for automatic reasoning with web content. It is even more important to metadata users who need a precise way to reference a particular concept when the term may have more than one definition. In this presentation, we will discuss and seek feedback on a number of questions arising from the application of persistent identifiers (pids) to metadata elements.