Schema path: ExternalReferenceType
The ExternalReferenceType complex type defines a collection of elements that provide a pointer to where more information and deeper insight can be obtained. Examples would be a research paper or an excerpt from a publication.
Not all of the elements need to be used, since some are designed for web references and others are designed for book references. The Author and Title elements should be filled out for all references if possible; Author is optional, but Title is required. The optional Edition element identifies the edition of the material being referenced in the event that multiple editions of the material exist. If the reference is part of a magazine or journal, the Publication element should be used to identify the name. The optional Publication_Year, Publication_Month, Publication_Day, and Publisher elements should be used to more specifically identify the book or publication via its date and publisher. The year must follow the YYYY format while the month must follow the --MM format and the day must follow the ---DD format. The URL and URL_Date elements are used to capture a URL for the material being referenced, if one exists, and the date when the URL was validated to exist.
The required Reference_ID attribute exists to provide a globally unique identifier for the reference (e.g., REF-1). The ID is used by other entities to link to this external reference.