http://dublincore.org/schemas/xmls/qdc/2003/04/02/dc.xsd This schema declares XML elements for the 15 Dublin Core elements in the "http://www.purl.org/dc/elements/1.1/" namespace. All elements are declared as substitutable for the abstract element DC-element. This is the default type for all of the DC elements. It defines a complexType SimpleLiteral which permits mixed content but disallows child elements by use of minOcccurs/maxOccurs. However, this complexType does permit the derivation of other types which would permit child elements. The scheme attribute may be used as a qualifier to reference an encoding scheme that describes the value domain for a given property. This group is included as a convenience for schema authors who need to refer to all the elements in the http://www.purl.org/dc/elements/1.1/ namespace. This complexType is included as a convenience for schema authors who need to define a root or container element for all of the DC elements.