issuedreleased

Issuedreleased is a generalized term encountered in metadata practices to describe the date associated with when a resource is issued and when it is released. It is not a standard field in major metadata schemes, but it can appear in customized catalogs or between systems that map different date properties.

In practice, issued and released refer to related but distinct concepts. The issued date typically denotes when the work was formally issued, published, or made available in some authority or market. The released date often indicates when the item was distributed or made publicly accessible, which can differ from the initial publication date, especially for products released in stages or in multiple regions. For example, a book might have an issued date of the official publication year, while a film or software product has a released date corresponding to its public debut or broad availability.

Common metadata practices separate these concepts. Dublin Core uses dateIssued to capture when a resource was issued, while some catalogs and media databases use dateReleased or datePublished to indicate public availability. When a single field must carry both values, some systems store them as a composite string or pair, such as "issued: 2020-03-15; released: 2020-04-10," or maintain a dedicated issuedReleased field as a project-specific option.

Best practices suggest using distinct fields for issued and released when possible to avoid ambiguity. If a single field is required, define a clear format and documentation so that users understand which dates are included and how to interpret them.