A type of IVOA resource describing (exactly) one database independently of any service giving access to the database. The mandatory core of the element details the database itself. There may, optionally, be additional elements describing the provenance and astronomical usage of the resource. The structure of the database. There may be detailed metadata for zero or more tables, and these are intended to be read by software. The must also be a human-readable description and a name. A db:DB element with no tables could be used to register a database for which the detailed schemata have not yet been worked out. State the formal name of the database by which it is known to the DBMS. This may be different to the name of the resource as specified in the http://www.ivoa.net/xml/VOResource/v0.10 namespace; the latter is for human reader and the current element is for the machines. Describe any special features of the database, if any. This description should avoid scientific description of the data collection as a whole (that is better put in the {http://www.ivoa.net/xml/VOResource/v0.10}Content structure). The description should also avoid duplicating the structural description of the tables in the {http://www.ivoa.net/xml/VODataService/v0.5}Table elements. If there is sublety about the relationship of the tables in the database, then describe it here.