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).
DPT Vaccine: Diphtheria, Tetanus and Pertussis. This is the concept behind the vaccination for diphtheria, tetanus, and pertussis (DPT). There are two forms of the DPT vaccine, DTwP and DTaP. DTwP (diphtheria, tetanus, and whole-cell pertussis) is cheaper and still used in the developing world.DTaP (diphtheria, tetanus, and acellular pertussis) is newer, widely used in the United States, and generally regarded as safer.efore the DPT vaccine was introduced, 17,000 children died in a single year in the United States alone in a diphtheria epidemic. In the 1990s, diphtheria spread across the newly independent states of the former Soviet Union and killed 3% to 23% of those affected by the disease (Red Book, 2012).