Metadata is  data about data. Two types of metadata exist: structural metadata and descriptive metadata. Structural metadata is data about the containers of data. Descriptive metadata uses individual instances of application data or the data content.hile the metadata application is manyfold covering a large variety of fields, there are specialised and well-accepted models to specify types of metadata. Bretheron & Singley (1994) distinguish between two distinct classes: structural/control metadata and guide metadata.
More information about the vaccine. The full name of the 5-in-1 vaccine is DTaP/IPV/Hib, which stands for âDiphtheria, Tetanus, acellular Pertussis, Inactivated Polio Vaccine, Hib (Haemophilus influenzae type b)â. The vaccine includes the acellular pertussis vaccine (the âaPâ in âDTaPâ).
The DTaP and Tdap vaccines both protect against three bacterial infections: diphtheria, tetanus and pertussis, whereas the Td vaccine only protects against diphtheria and tetanus. In addition, the vaccines vary in terms of who should receive them and the quantities of vaccine proteins they contain: