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).
pertussis vaccine a preparation of killed Bordetella pertussis bacilli (whole-cell vaccine) or of purified antigenic components thereof (acellular vaccine), used to immunize against pertussis; generally used in combination with diphtheria and tetanus toxoids (DTP or DTaP).oliovirus vaccine live oral (OPV) an oral vaccine against poliomyelitis consisting of three types of live, attenuated polioviruses. It is given orally, often on a sugar cube, and so is convenient for administration to children and large groups of people.