1. Dublin Core Metadata Initiative
The Dublin Core Metadata Initiative (DCMI) is the outcome of a joint workshop held in Dublin, Ohio, USA, by the Online Computer Library Center (OCLC) and the National Center of Supercomputing Application (NCSA) in 1995. The Dublin Core Metadata Element Set is a vocabulary of fifteen core elements (properties) for use in resource description. "Core" refers to the metadata terms as "broad and generic being usable for describing a wide range of resources.
Objective: The DCMI supports shared innovation in metadata design and best practices across a broad range of purposes and business models.
Core elements: Simple DC metadata proposes a set of 15 core elements, as shown in the table below.
2. Microformat
A microformat (sometimes abbreviated μF) is a web-based approach to semantic markup which seeks to re-use existing HTML/XHTML tags to convey metadata and other attributes in web pages and other contexts that support (X)HTML such as RSS. This approach allows software to process information intended for end-users (such as contact information, geographic coordinates, calendar events, and similar information) automatically.