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# RDF Container Elements * * * **RDF containers are used to describe a set of items. For example, listing the authors of a particular book.** **The following RDF elements are used to describe such groups: , , and .** * * * ## Element The element is used to describe a list of values that are unordered. The element can contain duplicate values. ### Example John Paul George Ringo * * * ## Element The element is used to describe a list of values that are ordered (such as alphabetical sorting). The element can contain duplicate values. ### Example George John Paul Ringo * * * ## Element The element is used to describe a list of alternative values (the user may only choose one of these values). ### Example CD Record Tape * * * ## RDF Terminology In the examples above, we discussed "lists of values" when describing container elements. In RDF, these "lists of values" are called members. Therefore, we can say: * A container is a resource that contains items. * The contained items are called members (they should not be referred to as "lists of values").