Typically, Subject will be expressed as keywords, key phrases or classification codes that describe a topic of the resource. Recommended best practice is to select a value from a controlled vocabulary or formal classification scheme. Typically, Date will be associated with the creation or availability of the resource. Recommended best practice for encoding the date value is defined in a profile called ISO 8601 W3C Date and Time Formats and includes (among others) dates of the form YYYY-MM-DD. Type includes terms describing general categories, functions, or genres, for content. Recommended best practice is to select a value from a controlled vocabulary or controlled classification scheme. To describe the physical or digital manifestation of the resource, use the FORMAT element. Typically, a Rights element will contain a rights management statement for the resource, or reference a service providing such information. Rights information often encompasses Intellectual Property Rights (IPR), Copyright, and various Property Rights. If the Rights element is absent, no assumptions can be made about the status of these and other rights with respect to the resource.