Metadata registries refer to a certain organization’s central location or storage area for all its metadata definition. Usually, metadata registries can be used whenever there are important data that will be constantly needed by a certain organization. Some of these organizations may be those that transfer information using the XML, EDI, or Web Services structures. Those organization in need of consistent data definition regardless of time and may use the data between different processes and organization may also need metadata registries especially if they are building data warehouse. Some organizations trying to break down their information “silos” within some applications can also use metadata registries.
Creating a metadata registry may seem simple to some. But creating a reliable and well-protected metadata registry is a different issue. Usually, metadata registries is a well-secured place where only few permitted officials can have access and make changes. The metadata registry also stores up different data elements including the representations and semantics. The semantic area contains all the meanings of a certain data element along with their precise definitions. The metadata registry area should also be defined well how it should be structured and formatted.
There are many metadata registries where public can have access. Examples of these are the Apelon Medical Registry, US Environmental Protection Agency, Australian Institute of Health and Welfare, and US Department of Defense Metadata Registry. Private companies that do not know how to create metadata registries can trust some names in the industry that provides metadata solutions. Among these vendors are the Data Foundations Metadata Registry, WellGEO RegREP, InfoLibrarian Metadata Integration Framework, freebXML Registry, and Masai Technologies.