The source attribute points to an external source. When used on elements describing schema components such as <schemaSpec> or <moduleRef> it identifies the source from which declarations for the components of the object being defined may be obtained. On other elements it provides a pointer to the bibliographical source from which a quotation or citation is drawn. In either case, the location may be provided using any form of URI, for example an absolute URI, a relative URI, or private scheme URI that is expanded to an absolute URI as documented in a prefixDef. If more than one location is specified, the default assumption is that the required source should be obtained by combining the resources indicated. |